File:ALVIN submersible.jpg

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has only limited underwater capability. The term submarine most commonly refers to large crewed autonomous vessels; however, historically or more casually, submarine can also refer to medium sized or smaller vessels (midget submarines, wet subs), Remotely Operated Vehicles or robots. The word submarine was originally an adjective meaning "under the sea", and so consequently other uses such as "submarine engineering" or "submarine cable" may not actually refer to submarines at all. Submarine was shortened from the term "submarine boat", and is often further shortened to "sub".

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Submarines are referred to as "boats" for historical reasons because vessels deployed from a ship are referred to as boats. The first submarines were launched in such a manner. The English term U-boat for a German submarine comes from the German word for submarine, U-Boot, itself an abbreviation for Unterseeboot ("undersea boat").

Although experimental submarines had been built before, submarine design took off during the 19th century. Submarines were first widely used in World War I, and feature in many large navies. Military usage ranges from attacking enemy ships or submarines, aircraft carrier protection, blockade running, ballistic missile submarines as part of a nuclear strike force, reconnaissance, conventional land attack (for example using a cruise missile), and covert insertion of special forces. Civilian uses for submarines include marine science, salvage, exploration and facility inspection/maintenance. Submarines can also be specialised to a function such as search and rescue, or undersea cable repair. Submarines are also used in tourism and for academic research.

Submarines have one of the largest ranges of capabilities in any vessel, ranging from small autonomous examples to one or two-person vessels operating for a few hours, to vessels which can remain submerged for 6 months such as the Russian Typhoon class. Submarines can work at greater depths than are survivable or practical for human divers. Modern deep diving submarines are derived from the bathyscaphe, which in turn was an evolution of the diving bell.

Most large submarines comprise a cylindrical body with conical ends and a vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes. In modern submarines this structure is the "sail" in American usage ("fin" in European usage). A "conning tower" was a feature of earlier designs: a separate pressure hull above the main body of the boat that allowed the use of shorter periscopes. There is a propeller (or pump jet) at the rear and various hydrodynamic control fins as well as ballast tanks. Smaller, deep diving and specialty submarines may deviate significantly from this traditional layout.

File:German UC-1 class submarine.jpg

==Military usage==
File:Bundesarchiv DVM 10 Bild-23-61-04, Versenkbares 7,5cm-U-Boot-Geschütz.jpg

Before and during World War II, the primary role of the submarine was anti-surface ship warfare. Submarines would attack either on the surface or submerged, using torpedoes or (on the surface) deck guns. They were particularly effective in sinking Allied transatlantic shipping in both World Wars, and in disrupting Japanese supply routes and naval operations in the Pacific in World War II.

Mine-laying submarines were developed in the early part of the 20th century. The facility was used in both World Wars. Submarines were also used for inserting and removing covert agents and military forces, for intelligence-gathering and to rescue aircrew during large-scale air attacks on islands, where the airmen would be told of safe places to crash-land damaged aircraft so the submarine crew could rescue them. Submarines could carry cargo through hostile waters or act as supply vessels for other submarines.

Submarines could usually locate and attack other submarines only on the surface, although Template:HMS managed to sink U-864 with a four torpedo spread while both were submerged. The British developed a specialised anti-submarine submarine in World War I, the R class. After World War II, with the development of the homing torpedo, better sonar systems, and nuclear propulsion, submarines also became able to hunt each other effectively.


The development of submarine-launched nuclear missiles and submarine-launched cruise missiles gave submarines a substantial and long-ranged ability to attack both land and sea targets with a variety of weapons ranging from cluster bombs to nuclear weapons.

The primary defense of a submarine lies in its ability to remain concealed in the depths of the ocean. Early submarines could be detected underwater by the sound they made. Water is an excellent conductor of sound, and submarines can detect and track comparatively noisy surface ships from long distances. Modern submarines are built with an emphasis on stealth. Advanced propeller designs, extensive sound-reducing insulation, and special machinery allow a submarine to be as quiet as ambient ocean noise, making them extremely difficult to detect. It takes specialized technology to find and attack modern submarines.

Active sonar uses the reflection of a sound emitted from the search equipment to detect submarines. It has been used since World War II by surface ships, submarines or even aircraft, but it gives away the position of the emitter and is susceptible to counter-measures.

A concealed military submarine is a real threat and, because of its stealth, it can force an enemy navy to waste resources searching large areas of ocean and protecting all ships against possible attack. This advantage was vividly demonstrated in the 1982 Falklands War when the British SSN HMS Conqueror sank the Argentine cruiser General Belgrano. After the sinking the Argentine Navy realized that they were vulnerable to submarine attack, and that they had no defense from it. Thus the Argentine surface fleet withdrew to port for the remainder of the war, though an Argentine submarine remained at sea.

==Civil uses==
Although the majority of the world's submarines are military ones, there are some civil submarines. They have a variety of uses, including tourism, exploration, oil and gas platform inspections and pipeline surveys. The first tourist submarine was launched in 1985, and by 1997 there were 45 of them operating around the world.<ref>==Further reading==
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    A semi-civilian use was the adaption of U-boats for cargo transport during WWI and WWII.

    == Technology ==
    ===Submersion and trimming===
    File:Submarine control surfaces2.svg

    All surface ships, as well as surfaced submarines, are in a positively buoyant condition, weighing less than the volume of water they would displace if fully submerged. To submerge hydrostatically, a ship must have negative buoyancy, either by increasing its own weight or decreasing its displacement of water. To control their weight, submarines have ballast tanks, which can be filled with outside water or pressurized air.

    For general submersion or surfacing, submarines use the forward and aft tanks, called Main Ballast Tanks or MBTs, which are filled with water to submerge, or filled with air to surface. Under submerged conditions, MBTs generally remain flooded, which simplifies their design, and on many submarines these tanks are a section of interhull space. For more precise and quick control of depth, submarines use smaller Depth Control Tanks or DCTs, also called hard tanks due to their ability to withstand higher pressure. The amount of water in depth control tanks can be controlled either to reflect changes in outside conditions or change depth. Depth control tanks can be located either near the submarine's center of gravity, or separated along the submarine body to prevent affecting trim.


    When submerged, the water pressure on submarine's hull can reach Template:Convert for steel submarines and up to Template:Convert for titanium submarines like Komsomolets, while interior pressure remains relatively unchanged. This difference results in hull compression, which decreases displacement. Water density also increases with depth, as the salinity and pressure are higher, but this incompletely compensates for hull compression, so buoyancy decreases as depth increases. A submerged submarine is in an unstable equilibrium, having a tendency to either fall or float to the surface. Keeping a constant depth requires continual operation of either the depth control tanks or control surfaces.<ref name="Physics Of Liquids & Gases">==Further reading==
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    Submarines in a neutral buoyancy condition are not intrinsically trim-stable. To maintain desired trim, submarines use forward and aft trim tanks. Pumps can move water between these, changing weight distribution, creating a moment pointing the sub up or down. A similar system is sometimes used to maintain stability.

    File:Kiosk Casabianca.jpg

    The hydrostatic effect of variable ballast tanks is not the only way to control the submarine underwater. Hydrodynamic maneuvering is done by several surfaces, which can be moved to create hydrodynamic forces when a submarine moves at sufficient speed. The stern planes, located near the propeller and normally horizontal, serve the same purpose as the trim tanks, controlling the trim, and are commonly used, while other control surfaces may not be present on many submarines. The fairwater planes on the sail and/or bow planes on the main body, both also horizontal, are closer to the centre of gravity, and are used to control depth with less effect on the trim.<ref>{{cite book
    |title=Concepts In Submarine Design
    |author=Roy Burcher, Louis Rydill
    |publisher=Cambridge University Press

    When a submarine performs an emergency surfacing, all depth and trim methods are used simultaneously, together with propelling the boat upwards. Such surfacing is very quick, so the sub may even partially jump out of the water, potentially damaging submarine systems.

    === Submarine hull ===
Main article: Submarine hull
File:USS Greeneville (SSN 772) in Dry Dock.jpg

Modern submarines are cigar-shaped. This design, visible in early submarines (see below) is sometimes called a "teardrop hull". It reduces the hydrodynamic drag when submerged, but decreases the sea-keeping capabilities and increases drag while surfaced. Since the limitations of the propulsion systems of early submarines forced them to operate surfaced most of the time, their hull designs were a compromise. Because of the slow submerged speeds of those subs, usually well below 10 kt (18 km/h), the increased drag for underwater travel was acceptable. Late in World War II, when technology allowed faster and longer submerged operation and increased aircraft surveillance forced submarines to stay submerged, hull designs became teardrop shaped again to reduce drag and noise. On modern military submarines the outer hull is covered with a layer of sound-absorbing rubber, or anechoic plating, to reduce detection.

The occupied pressure hulls of deep diving submarines such as DSV Alvin are spherical instead of cylindrical. This allows a more even distribution of stress at the great depth. A titanium frame is usually affixed to the pressure hull, providing attachment for ballast and trim systems, scientific instrumentation, battery packs, syntactic flotation foam, and lighting.

A raised tower on top of a submarine accommodates the periscope and electronics masts, which can include radio, radar, electronic warfare, and other systems including the snorkel mast. In many early classes of submarines (see history), the Control Room, or "Conn", was located inside this tower, which was known as the "conning tower". Since then, the Conn has been located within the hull of the submarine, and the tower is now called the "sail". The Conn is distinct from the "bridge", a small open platform in the top of the sail, used for observation during surface operation.

"Bathtubs" are related to conning towers but are used on smaller submarines. The bathtub is a metal cylinder surrounding the hatch that prevents waves from breaking directly into the cabin. It is needed because surfaced submarines have limited freeboard, that is, they lie low in the water. Bathtubs help prevent swamping the vessel.

==== Single / double hull ====
File:U995 2004 1.jpg

Modern submarines and submersibles, as well as the oldest ones, usually have a single hull. Large submarines generally have an additional hull or hull sections outside. This external hull, which actually forms the shape of submarine, is called the outer hull (casing in the Royal Navy) or light hull, as it does not have to withstand a pressure difference. Inside the outer hull there is a strong hull, or pressure hull, which withstands sea pressure and has normal atmospheric pressure inside.

As early as World War I, it was realized that the optimal shape for withstanding pressure conflicted with the optimal shape for seakeeping and minimal drag, and construction difficulties further complicated the problem. This was solved either by a compromise shape, or by using two hulls; internal for holding pressure, and external for optimal shape. Until the end of World War II, most submarines had an additional partial cover on the top, bow and stern, built of thinner metal, which was flooded when submerged. Germany went further with the Type XXI, the general predecessor of modern submarines, in which the pressure hull was fully enclosed inside the light hull, but optimised for submerged navigation, unlike earlier designs that were optimised for surface operation.

After World War II, approaches split. The Soviet Union changed its designs, basing them on German developments. All post-WWII heavy Soviet and Russian submarines are built with a double hull structure. American and most other Western submarines switched to a primarily single-hull approach. They still have light hull sections in the bow and stern, which house main ballast tanks and provide a hydrodynamically optimized shape, but the main cylindrical hull section has only a single plating layer. The double hulls are being considered for future submarines in the United States to improve payload capacity, stealth and range.<ref> National Defense magazine</ref>

==== Pressure hull ====
The pressure hull is generally constructed of thick high strength steel with a complex structure and high strength reserve, and is separated with watertight bulkheads into several compartments. There are also examples of more than two hulls in a submarine, like the Typhoon class, which has two main pressure hulls and three smaller ones for control room, torpedoes and steering gear, with the missile launch system between the main hulls.

The dive depth cannot be increased easily. Simply making the hull thicker increases the weight and requires reduction of onboard equipment weight, ultimately resulting in a bathyscaphe. This is acceptable for civilian research submersibles, but not military submarines.

WWI submarines had hulls of carbon steel, with a Template:Convert maximum depth. During WW II, high-strength alloyed steel was introduced, allowing Template:Convert depths. High-strength alloy steel remains the primary material for submarines today, with Template:Convert depths, which cannot be exceeded on a military submarine without design compromises. To exceed that limit, a few submarines were built with titanium hulls. Titanium can be stronger than steel, lighter, and is not ferromagnetic, important for stealth. Titanium submarines were built by the Soviet Union, which developed specialized high-strength alloys. It has produced several types of titanium submarines. Titanium alloys allow a major increase in depth, but other systems need to be redesigned to cope, so test depth was limited to Template:Convert for K-278 Komsomolets, the deepest-diving combat submarine. An Alfa class submarine may have successfully operated at Template:Convert,<ref>Federation of American Scientists</ref> though continuous operation at such depths would produce excessive stress on many submarine systems. Titanium does not flex as readily as steel, and may become brittle during many dive cycles. Despite its benefits, the high cost of titanium construction led to the abandonment of titanium submarine construction as the Cold War ended.

Deep diving civilian submarines have used thick acrylic pressure hulls. The deepest deep diving submarine to date is the Shinkai, which can dive to about Template:Convert.

The task of building a pressure hull is very difficult, as it must withstand pressures up to that of its required diving depth. When the hull is perfectly round in cross-section, the pressure is evenly distributed, and causes only hull compression. If the shape is not perfect, the hull is bent, with several points heavily strained. Inevitable minor deviations are resisted by stiffener rings, but even a one inch (25 mm) deviation from roundness results in over 30 percent decrease of maximal hydrostatic load and consequently dive depth.<ref>US Naval Academy</ref> The hull must therefore be constructed with high precision. All hull parts must be welded without defects, and all joints are checked multiple times with different methods, contributing to the high cost of modern submarines. (For example, each Virginia-class attack submarine costs US$2.6 billion, over US$200,000 per ton of displacement.)

=== Propulsion ===<!-- "diesel-electric tranmission" has a see also linking here-->
File:HMCS Windsor SSK 877.jpg

Originally, submarines were human propelled. The first mechanically driven submarine was the 1863 French Plongeur, which used compressed air for propulsion. Anaerobic propulsion was first employed by the Spanish Ictineo II in 1864, which used a solution of zinc, manganese dioxide, and potassium chlorate to generate sufficient heat to power a steam engine, while also providing oxygen for the crew. A similar system was not employed again until 1940 when the German Navy tested a hydrogen peroxide-based system, the Walter turbine, on the experimental V-80 submarine and later on the naval U-791 and type XVII submarines.<ref> ==Further reading==
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    Until the advent of nuclear marine propulsion, most 20th century submarines used batteries for running underwater and gasoline (petrol) or diesel engines on the surface, and for battery recharging. Early submarines used gasoline, but this quickly gave way to kerosene (paraffin), then diesel, because of reduced flammability. Diesel-electric became the standard means of propulsion. The diesel or gasoline engine and the electric motor, separated by clutches, were initially on the same shaft driving the propeller. This allowed the engine to drive the electric motor as a generator to recharge the batteries and also propel the submarine. The clutch between the motor and the engine would be disengaged when the submarine dove, so that the motor could drive the propeller. The motor could have multiple armatures on the shaft, which could be electrically coupled in series for slow speed and in parallel for high speed. (These connections were called "group down" and "group up", respectively.)

    ====Diesel-electric transmission====
    Early submarines used a direct mechanical connection between the engine and propeller, switching between diesel engines for surface running, and electric motors for submerged propulsion.

    In 1928 the United States Navy's Bureau of Engineering proposed a diesel-electric transmission; instead of driving the propeller directly while running on the surface, the submarine's diesel would drive a generator which could either charge the submarine's batteries or drive the electric motor. This meant that motor speed was independent of the diesel engine's speed, and the diesel could run at an optimum and non-critical speed, while one or more of the diesel engines could be shut down for maintenance while the submarine continued to run using battery power. The concept was pioneered in 1929 in the S-class submarines S-3, S-6, and S-7 to test the concept. No other navy adopted the system before 1945, apart from the Royal Navy's British U class submarines, though some submarines of the Imperial Japanese Navy used separate diesel generators for low speed running.<ref>==Further reading==
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    Other advantages of such an arrangement were that a submarine could travel slowly with the engines at full power to recharge the batteries quickly, reducing time on the surface or on snorkel. It was then possible to insulate the noisy diesel engines from the pressure hull, making the submarine quieter. Additionally, diesel-electric transmissions were more compact.

    File:2004-Bremerhaven U-Boot-Museum-Sicherlich retouched.jpg

    ====Air-independent propulsion====
Main article: Air-independent propulsion
During the Second World War, German Type XXI submarines were designed to carry hydrogen peroxide for long-term, fast air-independent propulsion, but were ultimately built with very large batteries instead. At the end of the War, the British and Russians experimented with hydrogen peroxide/kerosene (paraffin) engines which could be used surfaced and submerged. The results were not encouraging; although the Russians deployed a class of submarines with this engine type (codenamed Quebec by NATO), they were considered unsuccessful.

File:U Boot 212 HDW 1.jpg

Today several navies use air-independent propulsion. Notably Sweden uses Stirling technology on the Gotland class and Södermanland class submarines. The Stirling engine is heated by burning diesel fuel with liquid oxygen from cryogenic tanks. A newer development in air-independent propulsion is hydrogen fuel cells, first used on the German Type 212 submarine, with nine 34 kW or two 120 kW cells and soon to be used in the new Spanish S-80 class submarines.<ref>Template:Cite news</ref>

====Nuclear power====
Main article: Nuclear submarine
Steam power was resurrected in the 1950s with a nuclear-powered steam turbine driving a generator. By eliminating the need for atmospheric oxygen, the length of time that a modern submarine could remain submerged was limited only by its food stores, as breathing air was recycled and fresh water distilled from seawater. Nuclear-powered submarines have a relatively small battery and diesel engine/generator powerplant for emergency use if the reactors must be shut down.

Nuclear power is now used in all large submarines, but due to the high cost and large size of nuclear reactors, smaller submarines still use diesel-electric propulsion. The ratio of larger to smaller submarines depends on strategic needs. The US Navy, French Navy, and the Royal Navy operate only nuclear submarines,<ref name="Submarine Warfare">==Further reading==
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  • {{cite book | first=Robert | last=Heinlein | authorlink= | date=1980 | title=Expanded Universe | edition= | publisher=Ace Books | location=New York |</ref><ref>France Current Capabilities</ref> which is explained by the need for distant operations. Other major operators rely on a mix of nuclear submarines for strategic purposes and diesel-electric submarines for defence. Most fleets have no nuclear submarines, due to the limited availability of nuclear power and submarine technology. Diesel-electric submarines have a stealth advantage over their nuclear counterparts. Nuclear submarines generate noise from coolant pumps and turbo-machinery needed to operate the reactor, even at low power levels.<ref>==Further reading==
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  • {{cite book | first=Robert | last=Heinlein | authorlink= | date=1980 | title=Expanded Universe | edition= | publisher=Ace Books | location=New York |</ref> Some nuclear submarines such as the American Ohio class do not have coolant pumps etc. in the reactors, and are quieter than electric subs. A conventional submarine operating on batteries is almost completely silent, the only noise coming from the shaft bearings, propeller, and flow noise around the hull, all of which stops when the sub hovers in mid water to listen. Commercial submarines usually rely only on batteries, since they never operate independently of a mother ship.

    ====Alternative propulsion====
    Oil-fired steam turbines powered the British "K" class submarines, built during the first World War (and later), to give them the surface speed to keep up with battle fleet. The "K" class subs were not very successful, however.

    Toward the end of the 20th century, some submarines, such as the British Vanguard class, began to be fitted with pump-jet propulsors instead of propellers. Although these are heavier, more expensive, and less efficient than a propeller, they are significantly quieter, giving an important tactical advantage.

    Magnetohydrodynamic drive (MHD) was portrayed as the operating principle behind the titular submarine's nearly silent propulsion system in the film adaptation of The Hunt for Red October. However, in the novel, the Red October did not use MHD.  Although experimental surface ships have used this system, speeds have been below expectations.Template:Citation needed In addition, the drive system can induce bubble formation, compromising stealth, and the low efficiency requires high powered reactors. These factors make it unlikely for military usage.Template:Citation needed

    File:Mark 48 Torpedo testing.jpg

    The success of the submarine is inextricably linked to the development of the torpedo, invented by Robert Whitehead in 1866. His invention is essentially the same now as it was 140 years ago. Only with self propelled torpedoes could the submarine make the leap from novelty to a weapon of war. Until the perfection of the guided torpedo, multiple "straight running" torpedoes were required to attack a target. With at most 20 to 25 torpedoes stored onboard, the number of attacks was limited. To increase combat endurance most WWI submarines functioned as submersible gunboats, using their deck guns against unarmed targets, and diving to escape and engage enemy warships. The importance of guns encouraged the development of the unsuccessful Submarine Cruiser such as the French Surcouf and the Royal Navy's X1 and M class submarines. With the arrival of ASW aircraft, guns became more for defence than attack. A more practical method of increasing combat endurance was the external torpedo tube, loaded only in port.


    The ability of submarines to approach enemy harbours covertly led to their use as minelayers. Minelaying submarines of WWI and WWII were specially built for that purpose. Modern submarine-laid mines, such as the British Mark 6 Sea Urchin, are designed to be deployed by a submarine's torpedo tubes.

    After WWII, both the US and the USSR experimented with submarine launched cruise missiles such as the SSM-N-8 Regulus and P-5 Pyatyorka. Such missiles required the submarine to surface to fire its missiles. They were the forerunners of modern submarine launched cruise missiles, which can be fired from the torpedo tubes of submerged submarines, for example the US BGM-109 Tomahawk and Russian RPK-2 Viyuga. Ballistic missiles can also be fired from a submarine's torpedo tubes, for example missiles such as the anti-submarine SUBROC, and versions of surface to surface anti-ship missiles such as the Exocet and Harpoon, encapsulated for submarine launch. With internal volume as limited as ever and the desire to carry heavier warloads, the idea of the external launch tube was revived, usually for encapsulated missiles, with such tubes being placed between the internal pressure and outer streamlined hulls.

    The strategic mission of the SSM-N-8 and the P-5 were taken up by submarine-launched ballistic missile beginning with the US Navy's Polaris missile, and subsequently the Poseidon and Trident missiles.

    Germany is working on the short-range IDAS (missile) which is lauched from a torpedo tube and can be used against ASW helicopters as well as surface ships and coastal targets.

    A submarine will have a variety of sensors determined by its missions. Modern military submarines rely almost entirely on a suite of passive and active sonars to find their prey. Active sonar relies on an audible "ping" to generate echoes to reveal objects around the submarine. Active systems are rarely used, as doing so reveals the sub's presence. Passive sonar is a set of sensitive hydrophones set into the hull or trailed in a towed array, generally several hundred feet long. The towed array is the mainstay of NATO submarine detection systems, as it reduces the flow noise heard by operators. Hull mounted sonar is employed to back up the towed array, and in confined waters where a towed array could be fouled by obstacles.

    Submarines also carry radar equipment for detection of surface ships and aircraft. Sub captains are more likely to use radar detection gear rather than active radar to detect targets, as radar can be detected far beyond its own return range, revealing the submarine. Periscopes are rarely used, except for position fixes and to verify a contact's identity.

    Civilian submarines, such as the DSV Alvin or the Russian Mir submersibles, rely on small active sonar sets and viewing ports to navigate. Sunlight does not penetrate below about Template:Convert underwater, so high intensity lights are used to illuminate the viewing area.


    Early submarines had few navigation aids, but modern subs have a variety of navigation systems. Modern military submarines use an inertial guidance system for navigation while submerged, but drift error unavoidably builds up over time. To counter this, the Global Positioning System will occasionally be used to obtain an accurate position. The periscope - a retractable tube with prisms allowing a view to the surface - is only used occasionally in modern submarines, since the range of visibility is short. The Virginia-class submarines and Astute Class submarines have photonics masts rather than hull-penetrating optical periscopes. These masts must still be hoisted above the surface, and employ electronic sensors for visible light, infrared, laser range-finding, and electromagnetic surveillance.

Main article: Communication with submarines
Military submarines have several systems for communicating with distant command centers or other ships. One is VLF radio, which can reach a submarine either on the surface or submerged to a fairly shallow depth, usually less than Template:Convert. ELF frequencies can reach a submarine at much greater depths, but have a very low bandwidth and are generally used to call a submerged sub to a shallower depth where VLF signals can reach. A submarine also has the option of floating a long, buoyant wire to a shallower depth, allowing VLF transmissions to be made by a deeply submerged boat.

By extending a radio mast, a submarine can also use a "burst transmission" technique. A burst transmission takes only a fraction of a second, minimizing a submarine's risk of detection.

To communicate with other submarines, a system known as Gertrude is used. Gertrude is basically a sonar telephone. Voice communication from one submarine is transmitted by low power speakers into the water, where it is detected by passive sonars on the receiving submarine. The range of this system is probably very short, and using it radiates sound into the water, which can be heard by the enemy.

Civilian submarines can use similar, albeit less powerful systems to communicate with support ships or other submersibles in the area.

===Command and control===
All submarines need facilities to control their motion. Military submarines also need facilities to operate their sensors and weapons.

== Crew ==
A typical nuclear submarine has a crew of over 80. Non-nuclear boats typically have fewer than half as many. The conditions on a submarine can be difficult because crewmembers must work in isolation for long periods of time, without family contact. Submarines normally maintain radio silence to avoid detection. Operating a submarine is dangerous, even in peacetime, and submarines have been lost in accidents.

=== Women as part of crew ===
Most navies prohibited women from serving on submarines, even after they had been permitted to serve on surface warships. The Royal Norwegian Navy became the first navy to allow female crew on its submarines in 1985. The Royal Danish Navy allowed for female submariners in 1988.<ref name="fesub">NATO Review - Vol.49 - No 2 - Summer 2001: Women in uniform</ref> Others followed suit including the Swedish Navy (1989),<ref>==Further reading==
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    The British Royal Navy also does not permit women to serve on its submarines because of "medical concerns for the safety of the foetus and hence its mother" due to the potentially compromised air quality onboard submarines.<ref>==Further reading==
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  • ==Further reading==
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    Women have served on U.S. Navy surface ships since 1993 but do not serve on submarines. The Navy only allows three exceptions for women being on board military submarines: 1) Female civilian technicians for a few days at most; 2) Women midshipmen on an overnight during summer training for both Navy ROTC and Naval Academy; 3) Family members for one-day dependent cruises.<ref> question #10</ref>

    Both the U.S. and British navies operate nuclear-powered submarines which deploy for periods of six months or longer, whereas other navies which permit women on submarines operate conventionally powered submarines, which deploy for much shorter periods, usually only for one or two months.<ref>==Further reading==
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  • {{cite book | first=Robert | last=Heinlein | authorlink= | date=1980 | title=Expanded Universe | edition= | publisher=Ace Books | location=New York |</ref>  No nation using nuclear submarines currently permits women to serve onboard them.<ref>Navy Seeks to Allow Women to Serve on Submarines</ref>
    Removing the ban in the U.S. Navy has been put to congressional lawmakers by Joint Chiefs Chairman Adm. Michael Mullen, following a review by Navy Secretary Ray Mabus and Chief of Naval Operations Adm. Gary Roughead.<ref name="Women should serve">Template:Cite news</ref>

    ==Life support systems==

    With nuclear power, submarines can remain submerged for months at a time. Diesel submarines must periodically resurface or snorkel to recharge their batteries. Most modern military submarines generate breathing oxygen by electrolysis of water. Atmosphere control equipment includes a CO<sub>2</sub> scrubber, which uses an amine absorbent to remove the gas from air and diffuse it into waste pumped overboard. A machine that uses a catalyst to convert carbon monoxide into carbon dioxide (removed by the CO<sub>2</sub> scrubber) and bonds hydrogen produced from the ship's storage battery with oxygen in the atmosphere to produce water, is also used. An atmosphere monitoring system samples the air from different areas of the ship for nitrogen, oxygen, hydrogen, R-12 and R-114 refrigerants, carbon dioxide, carbon monoxide, and other gases. Poisonous gases are removed, and oxygen is replenished by use of an oxygen bank located in a main ballast tank. Some heavier submarines have two oxygen bleed stations (forward and aft). The oxygen in the air is sometimes kept a few percent less than atmospheric concentration to reduce fire danger.

    Fresh water is produced by either an evaporator or a reverse osmosis unit.  The primary use for fresh water is to provide feed water for the reactor and steam propulsion plants. It is also available for showers, sinks, cooking and cleaning once propulsion plant needs have been met. Seawater is used to flush toilets, and the resulting "black water" is stored in a sanitary tank until it is blown overboard using pressurized air or pumped overboard by using a special sanitary pump. The method for blowing sanitaries overboard is difficult to operate, and the German Type VIIC boat U-1206 was lost with casualties because of a mistake with the toilet.<ref>U-1206</ref> Water from showers and sinks is stored separately in "gray water" tanks, which are pumped overboard using the drain pump.

    Trash on modern large submarines is usually disposed of using a tube called a Trash Disposal Unit (TDU), where it is compacted into a galvanised steel can. At the bottom of the TDU is a large ball valve. An ice plug is set on top of the ball valve to protect it, the cans atop the ice plug. The top breech door is shut, and the TDU is flooded and equalised with sea pressure, the ball valve is opened and the cans fall out assisted by scrap iron weights in the cans.  The TDU is also flushed with seawater to ensure it is completely empty and the ball valve is clear before shutting the valve.

    == History of submarines ==
Main article: History of submarines
Template:Move portions
=== Early history of submarines and the first submersibles ===
The first submersible with reliable information on its construction was built in 1620 by Cornelius Jacobszoon Drebbel, a Dutchman in the service of James I of England. It was created to the standards of the design outlined by English mathematician William Bourne. It was propelled by means of oars. The precise nature of the submarine type is a matter of some controversy; some claim that it was merely a bell towed by a boat. Two improved types were tested in the Thames between 1620 and 1624. In 2002 a two-person version of Bourne's design was built for the BBC TV programme Building the Impossible by Mark Edwards, and successfully rowed under water at Dorney Lake, Eton.

Though the first submersible vehicles were tools for exploring under water, it did not take long for inventors to recognize their military potential. The strategic advantages of submarines were set out by Bishop John Wilkins of Chester, England, in Mathematicall Magick in 1648:

# Tis private: a man may thus go to any coast in the world invisibly, without discovery or prevented in his journey.
# Tis safe, from the uncertainty of Tides, and the violence of Tempests, which do never move the sea above five or six paces deep. From Pirates and Robbers which do so infest other voyages; from ice and great frost, which do so much endanger the passages towards the Poles.
# It may be of great advantages against a Navy of enemies, who by this may be undermined in the water and blown up.
# It may be of special use for the relief of any place besieged by water, to convey unto them invisible supplies; and so likewise for the surprisal of any place that is accessible by water.
# It may be of unspeakable benefit for submarine experiments.

=== The first military submarines ===

The first military submarine was Turtle (1775), a hand-powered egg-shaped device designed by the American David Bushnell to accommodate a single person. It was the first verified submarine capable of independent underwater operation and movement, and the first to use screws for propulsion. During the American Revolutionary War, Turtle (operated by Sgt. Ezra Lee, Continental Army) tried and failed to sink the British warship HMS Eagle, flagship of the blockaders in New York harbor on September 7, 1776.

In 1800, France built a human-powered submarine designed by American Robert Fulton, the Nautilus. The French eventually gave up on the experiment in 1804, as did the British when they later considered Fulton's submarine design.

During the War of 1812, in 1814, Silas Halsey lost his life while using a submarine in an unsuccessful attack on a British warship stationed in New London harbor.

In 1851, a Bavarian artillery corporal, Wilhelm Bauer, took a submarine designed by him called the Brandtaucher (incendiary-diver) to sea in Kiel Harbour. This submarine was built by August Howaldt and powered by a treadwheel. It sank but the three crew managed to escape. The submarine was raised in 1887 and is on display in a museum in Dresden.

=== Submarines in the American Civil War ===<!-- This section is linked from John Philip Holland -->
File:USS Alligator 0844401.jpg

During the American Civil War, the Union was the first to field a submarine. The French-designed Alligator was the first U.S. Navy sub and the first to feature compressed air (for air supply) and an air filtration system. Initially hand-powered by oars, it was converted after 6 months to a screw propeller powered by a hand crank. With a crew of 20, it was larger than Confederate submarines. Alligator was 47 feet (14.3 m) long and about 4 feet (1.2 m) in diameter. It was lost in a storm off Cape Hatteras on April 1, 1863 with no crew and under tow to its first combat deployment at Charleston.

The Confederate States of America fielded several human-powered submarines. The first Confederate submarine was the Template:Convert long Pioneer which sank a target schooner using a towed mine during tests on Lake Pontchartrain, but was not used in combat. It was scuttled after New Orleans was captured and in 1868 was sold for scrap. The Bayou St. John Confederate Submarine was also scuttled without seeing combat, and is now on display at the Louisiana State Museum.

The Confederate submarine H. L. Hunley (named for one of its financiers, Horace Lawson Hunley) was intended for attacking the North's ships, which were blockading the South's seaports. The submarine had a long pole with an explosive charge in the bow, called a spar torpedo. The sub had to approach an enemy vessel, attach an explosive, move away, and then detonate it. The sub was extremely hazardous to operate, and had no air supply other than what was contained inside the main compartment. On two occasions, the sub sank; on the first occasion half the crew died and on the second, the entire eight-man crew (including Hunley himself) drowned. On February 17, 1864 Hunley sank USS Housatonic off Charleston Harbor, the first time a submarine successfully sank another ship, though it sank in the same engagement shortly after signaling its success. Submarines did not have a major impact on the outcome of the war, but did portend their coming importance to naval warfare and increased interest in their use in naval warfare.

=== South America ===
The first submarine in South America was the Hipopotamo, tested in Ecuador on September 18, 1837. It was built by Jose Rodriguez Lavandera, who successfully crossed the Guayas River in Guayaquil accompanied by Jose Quevedo. Rodriguez Lavandera enrolled in the Navy in 1823, becoming a Lieutenant by 1830. The Hipopotamo crossed the Guayas on two more occasions, but it was then abandoned because of lack of funding and interest from the government.

The submarine Flach was commissioned in 1865 by the Chilean government during the war of Chile and Peru against Spain (1864-1866). It was built by the German engineer Karl Flach. The submarine sank during tests in Valparaiso bay on May 3, 1866, with the entire eleven-man crew.

=== Mechanically-powered submarines (late 19th century) ===

The first submarine not relying on human power for propulsion was the French Plongeur, launched in 1863, and using compressed air at 180 psi (1241 kPa).<ref name="globalsecurity">Globalsecurity</ref>

The first combustion-powered submarine was Ictineo II, designed in Spain by Narcís Monturiol. Originally launched in 1864 as human-powered, propelled by 16 ,<ref name="globalsecurity" /> it was converted to peroxide propulsion and steam in 1867. The 14 meter (46 ft) craft was designed for a crew of two, could dive to 30 metres (96 ft), and demonstrated dives of two hours. On the surface it ran on a steam engine, but underwater such an engine would quickly consume the submarine's oxygen; so Monturiol invented an air-independent propulsion system. While the air-independent power system drove the screw, the chemical process driving it also released oxygen into the hull for the crew and an auxiliary steam engine. Monturiol's fully functional, double hulled vessels also solved pressure and buoyancy control problems that had bedeviled earlier designs.

File:Ictineo II.jpg

In 1870, the French writer Jules Verne published the science fiction classic 20,000 Leagues under the Sea, which concerns the adventures of a maverick inventor in Nautilus, a submarine more advanced than any at the time. The story inspired inventors to build more advanced submarines.

In 1879, the Peruvian government, during the War of the Pacific, commissioned and built the fully operational submarine Toro Submarino. It never saw military action before being scuttled after the defeat of that country in the war to prevent its capture by the enemy.

The first submarine to be mass-produced was human-powered. It was the submarine of the Polish inventor Stefan Drzewiecki—50 units were built in 1881 for the Russian government. In 1884 the same inventor built an electric-powered submarine.

File:Nordenfelt submarine Abdülhamid.jpg

Discussions between the English clergyman and inventor George Garrett and the industrially and commercially adept Swede Thorsten Nordenfelt led to a series of steam-powered submarines. The first was the Nordenfelt I, a 56 tonne, 19.5 metre (64 ft) vessel similar to Garret's ill-fated Resurgam (1879), with a range of 240 kilometres (150 mi, 130 nm), armed with a single torpedo, in 1885. Like Resurgam, Nordenfelt I operated on the surface by steam, then shut down its engine to dive. While submerged the submarine released pressure generated when the engine was running on the surface to provide propulsion for some distance underwater. Greece, fearful of the return of the Ottomans, purchased it. Nordenfelt then built Nordenfelt II (Abdülhamid) in 1886 and Nordenfelt III (Abdülmecid) in 1887, a pair of 30 metre (100 ft) submarines with twin torpedo tubes, for the Ottoman navy. Abdülhamid became the first submarine in history to fire a torpedo submerged.<ref name=""/> Nordenfelt's efforts culminated in 1887 with Nordenfelt IV which had twin motors and twin torpedoes. It was sold to the Russians, but proved unstable, ran aground, and was scrapped.

File:Peral Submarine Cartagena,ES 2007.jpg

On September 8, 1888, an electrically powered vessel built by the Spanish engineer and sailor Isaac Peral for the Spanish Navy was launched. It had two torpedoes, new air systems, and a hull shape, propeller, and cruciform external controls anticipating much later designs. Its underwater speed was ten knots (19 km/h). In June 1890 Peral's submarine launched a torpedo while submerged. Its ability to fire torpedoes under water while maintaining full propulsive power and control has led some to call it the first U-boat. After many successful dives the project was scrapped because of the difficulties of recharging at sea and the short range of battery-powered vessels.

Shortly after, the French Gymnote was launched on September 24, 1888. The electrically-powered Gymnote, another fully functional military submarine, completed 2,000 dives successfully.

Many more designs were built at this time by various inventors, but submarines were not to become effective weapons until the 20th century.

=== Late 19th century to World War I ===
File:USS Plunger;0800206.jpg

The turn of the 19th century marked a pivotal time in the development of submarines, with a number of important technologies making their debut, as well as the widespread adoption and fielding of submarines by a number of nations. Diesel electric propulsion would become the dominant power system and equipment such as the periscope would become standardized. Large numbers of experiments were done by countries on effective tactics and weapons for submarines, all of which would culminate in them making a large impact on the coming World War I.

In 1896, the Irish-American inventor John Philip Holland designed submarines that, for the first time, made use of internal combustion engine power on the surface and electric battery power for submerged operations. The Holland VI was launched on May 17, 1897 at Navy Lt. Lewis Nixon's Crescent Shipyard of Elizabeth, New Jersey. On April 11, 1900 the United States Navy purchased the revolutionary Holland VI and renamed it the Template:USS, America's first commissioned submarine. (John P. Holland's company, the Holland Torpedo Boat Company/Electric Boat Company became General Dynamics "Cold War" progeny and is arguably the builder of the world's most technologically advanced submarines today).

A prototype version of the Plunger class or A-class submarines, the Fulton, was developed at Nixon's Crescent Shipyard for the United States Navy before the construction of the A-class submarines there in 1901. A naval architect and shipbuilder from the United Kingdom, Arthur Leopold Busch, superintended the development of these first submarines for Holland's company. However the Fulton was never purchased by the U.S. Navy and was eventually sold to the Imperial Russian Navy during the Russo-Japanese War of 1904-1905. Two other A-class vessels were built on the West Coast of (USA) at Mare Island Naval Shipyard/Union Iron Works circa 1901. In 1902, Holland received a patent for his persistent pursuit to perfect the underwater naval craft. By this time, Holland was no longer in control of the day to day operations at Electric Boat, as others were now at the helm of the company he once founded. The acumen of business were now in control of these operations as Holland was forced to step down. His resignation from the company was to be effective as of April 1904.<ref>Template:US patent</ref>


Many other countries became interested in Holland's products around this time. Holland's innovations and ideas were considered to be the most technologically advanced at the time and were universally acknowledged as such. From 1901 onwards some of Holland's vessels were purchased by the United States Navy and other governments including the United Kingdom, the Imperial Russian Navy, Imperial Japanese Navy and the Royal Netherlands Navy.

Commissioned in June 1900, the French steam and electric submarine Narval introduced the classic double-hull design, with a pressure hull inside the outer light hull. These 200-ton ships had a range of over Template:Convert on the surface, and over Template:Convert underwater. The French submarine Aigrette in 1904 further improved the concept by using a diesel rather than a gasoline engine for surface power. Large numbers of these submarines were built, with seventy-six completed before 1914.

=== Submarines during World War I ===

Military submarines first made a significant impact in World War I. Forces such as the U-boats of Germany saw action in the First Battle of the Atlantic, and were responsible for the sinking of Lusitania, which was sunk as a result of unrestricted submarine warfare and is often cited among the reasons for the entry of the United States into the war.<ref>==Further reading==
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    The U-boats' ability to function as practical war machines relied on new tactics, their numbers, and submarine technologies such as combination diesel-electric power system developed in the preceding years. More submersibles than true submarines, U-boats operated primarily on the surface using regular engines, submerging occasionally to attack under battery power. They were roughly triangular in cross-section, with a distinct keel to control rolling while surfaced, and a distinct bow.

    === Interwar developments ===
    Various new submarine designs were developed during the interwar years. Among the most notorious ones were submarine aircraft carriers, equipped with a waterproof hangar and steam catapult to launch and recover one or more small seaplanes. The submarine and its plane could then act as a reconnaissance unit ahead of the fleet, an essential role at a time when radar still did not exist. The first example was the British HMS M2, followed by the French Surcouf, and numerous aircraft-carrying submarines in the Imperial Japanese Navy. <!--commenting out incomplete sentence The 1929 Surcouf was also designed as an "underwater cruiser", -->

    === Submarines during World War II ===
Main article: U-boat

Germany had the largest submarine fleet during World War II. Due to the Treaty of Versailles limiting the surface navy, the rebuilding of the German surface forces had only begun in earnest a year before the outbreak of World War II. Expecting to be able to defeat the Royal Navy through underwater warfare, the German High Command pursued commerce raiding and immediately stopped all construction on capital surface ships save the nearly completed Bismarck class battleships and two cruisers, switching its resources to submarines, which could be built more quickly. Though it took most of 1940 to expand the production facilities and get the mass production started, more than a thousand submarines were built by the end of the war.

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Germany put submarines to devastating effect in the Second Battle of the Atlantic in World War II, attempting but ultimately failing to cut off Britain's supply routes by sinking more merchant ships than Britain could replace. The supply lines were vital to Britain for food and industry, as well as armaments from the US. Although the U-boats had been updated in the intervening years, the major innovation was improved communications, encrypted using the famous Enigma cipher machine. This allowed for mass-attack tactics or "wolf packs" (Rudeltaktik), but was also ultimately the U-boats' downfall.

After putting to sea, U-boats operated mostly on their own, trying to find convoys in areas assigned to them by the High Command. If a convoy was found, the submarine did not attack immediately, but shadowed the convoy to allow other submarines in the area to find the convoy. These were then grouped into a larger striking force to attack the convoy simultaneously, preferably at night while surfaced.

From September 1939 to the beginning of 1943, the Ubootwaffe ("U-boat force") scored unprecedented success with these tactics, but were too few to have any decisive success. By the spring of 1943, German U-boat construction was at full capacity, but this was more than nullified by increased numbers of convoy escorts and aircraft, as well as technical advances like radar and sonar. Huff-Duff and Ultra allowed the Allies to route convoys around wolf packs when they detected them from their radio transmissions. The results were devastating: from March to July of that year, over 130 U-boats were lost, 41 in May alone. Concurrent Allied losses dropped dramatically, from 750,000 tons in March to only 188,000 in July. Although the Second battle of the Atlantic would continue to the last day of the war, the U-boat arm was unable to stem the tide of personnel and supplies, paving the way for Operation Torch, Operation Husky, and ultimately, D-Day. Winston Churchill wrote that the U-boat "peril" was the only thing that ever gave him cause to doubt the Allies' eventual victory.

==== Japan ====
Main article: Imperial Japanese Navy submarines

File:I400 2.jpg

The Imperial Japanese Navy started their submarine service with five Holland Type VII class submarines purchased from the Electric Boat Company in 1904. Japan had the most varied fleet of submarines of World War II; including Kaiten crewed torpedoes, midget submarines (Ko-hyoteki and Kairyu), medium-range submarines, purpose-built supply submarines and long-range fleet submarines. They also had submarines with the highest submerged speeds during World War II (Sen taka I-200 class submarines) and submarines that could carry multiple aircraft the (Sen toku I-400 class submarine). They were also equipped with one of the most advanced torpedoes of the conflict, the oxygen-propelled Type 95.

Nevertheless, despite their technical prowess, Japan had chosen to utilize its submarines for fleet warfare, and consequently were relatively unsuccessful, as warships were fast, maneuverable and well-defended compared to merchant ships. In 1942, a Japanese submarine sank one aircraft carrier, damaged one battleship, and damaged one destroyer (which sank later) from one torpedo salvo; and during the Battle of Midway were able to deliver the coup de grace to another fleet aircraft carrier.  With the lack of fuel oil and air supremacy, Imperial submarines were not able to sustain those kind of results afterwards. By the end of the war, submarines were instead often used to transport supplies to island garrisons.

==== United States ====
File:USS Grayback (SS 208).jpg

The United States Navy used its submarine force to attack both warships and merchant shipping; and destroyed more Japanese shipping than all other weapons combined. This feat was considerably aided by the Imperial Japanese Navy's failure to provide adequate escort forces for the nation's merchant fleet.

Whereas Japan had the finest submarine torpedoes of the war, the U.S. Navy had the worst: the Mark 14 torpedo that ran ten feet too deep, tipped with a Mk VI exploder that was based on an unimproved version of the Mark V contact exploder but with an additional magnetic exploder, neither of which was reliable. The faulty depth control mechanism of the Mark 14 was corrected in August 1942, but field trials for the exploders were not ordered until mid-1943, when tests in Hawaii and Australia confirmed the flaws. Fully operational Mark 14 torpedoes were not put into service until September 1943. The Mark 15 torpedo used by US surface combatants had the same Mk VI exploder and was not fixed until late 1943. One attempt to correct the problems resulted in a wakeless, electric torpedo being placed in submarine service, but USS Tang and Tullibee were lost to self-inflicted hits by these torpedoes.

During World War II, 314 submarines served in the United States Navy, of which nearly 260 were deployed to the Pacific.<ref name="O'Kane, p. 333">O'Kane, p. 333</ref> On December 7, 1941, 111 boats were in commission; 203 submarines from the Gato, Balao, and Tench classes were commissioned during the war. During the war, 52 US submarines were lost to all causes, with 48 lost directly to hostilities;<ref>Blair, Clay, Jr. Silent Victory, pp.991-2. The others were lost to accidents or, in the case of Seawolf, friendly fire.</ref>  3,505<ref name="O'Kane, p. 333"/><ref>3,506, less the crews of S-26, R-12, and possibly Dorado lost to accident, and Seawolf, to friendly fire. Darter, lost to grounding, took no casualties. Blair, passim.</ref> sailors were lost, the highest percentage killed in action of any US service arm in WWII. US submarines sank 1,560 enemy vessels,<ref name="O'Kane, p. 333"/> a total tonnage of 5.3 million tons, including 8 aircraft carriers and over 200 warships.

==== United Kingdom ====
The Royal Navy Submarine Service was primarily used to enforce the classic British blockade role. It therefore chiefly operated in inshore waters and tended to only surface by night.Template:Citation needed

Its major operating areas were around Norway, the Mediterranean (against the Axis supply routes to North Africa), and in the Far East. RN submarines operating out of Trincomalee and Australia were a constant threat to Japanese shipping passing through the Malacca Straits.Template:Citation needed

In the war British submarines sank 2 million tons of enemy shipping and 57 major warships, the latter including 35 submarines. Amongst these is the only instance ever of a submarine sinking another submarine while both were submerged. This occurred when HMS Venturer engaged the U864; the Venturer crew manually computed a successful firing solution against a three-dimensionally manoeveuring target using techniques which became the basis of modern torpedo computer targeting systems. Seventy-four British submarines were lost, half probably to naval mines.<ref>Template:Citeweb</ref>

==== The snorkel ====

Diesel-electric submarines need air to run their diesel engines, and so carried very large batteries for submerged operation. The need to recharge the batteries from the diesel engines limited the endurance of the submarine while submerged and required it to surface regularly for extended periods, during which it was especially vulnerable to detection and attack. The snorkel, a prewar Dutch invention, was used to allow German submarines to run their diesel engines whilst running just under the surface, drawing air through a tube from the surface.

The German Navy also experimented with engines that would use hydrogen peroxide to allow diesel fuel to be used while submerged, but technical difficulties were great. The Allies experimented with a variety of detection systems, including chemical sensors to "smell" the exhaust of submarines.
Cold-war diesel-electric submarines, such as the Oberon class, used batteries to power their electric motors in order to run silently. They recharged the batteries using the diesel engines without ever surfacing.Template:Citation needed

=== Modern military submarines ===
The first launch of a cruise missile (SSM-N-8 Regulus) from a submarine occurred in July 1953 from the deck of USS Tunny (SSG-282), a World War II fleet boat modified to carry this missile with a nuclear warhead. Tunny and her sister boat USS Barbero (SSG-317) were the United States's first nuclear deterrent patrol submarines. They were joined in 1958 by two purpose built Regulus submarines, USS Grayback (SSG-574), USS Growler (SSG-577), and, later, by the nuclear powered USS Halibut (SSGN-587).

In the 1950s, nuclear power partially replaced diesel-electric propulsion. Equipment was also developed to extract oxygen from sea water. These two innovations gave submarines the ability to remain submerged for weeks or months, and enabled previously impossible voyages such as USS Nautilus' crossing of the North pole beneath the Arctic ice cap in 1958 <ref>History of USS Nautilus SSN571<!-- Bot generated title --></ref> and the USS Triton's submerged circumnavigation of the world in 1960.<ref>May 10, 1960: USS Triton Completes First Submerged Circumnavigation<!-- Bot generated title --></ref> Most of the naval submarines built since that time in the United States and the Soviet Union/Russia have been powered by nuclear reactors. The limiting factors in submerged endurance for these vessels are food supply and crew morale in the space-limited submarine.

In 1959–1960, the first ballistic missile submarines were put into service by both the United States (George Washington class) and the Soviet Union (Hotel class) as part of the Cold War nuclear deterrent strategy.

While the greater endurance and performance from nuclear reactors makes nuclear submarines better for long-distance missions or the protection of a carrier battle group, their reactor cooling pumps have traditionally made them noisier, and thus easier to detect, than conventional diesel-electric submarines. Diesel-electrics have continued to be produced by both nuclear and non-nuclear powers as they lack this limitation, except when required to run the diesel engine to recharge the ship’s battery. Recent technological advances in sound damping, noise isolation, and cancellation have made nuclear subs quieter and substantially eroded this advantage. Though far less capable regarding speed and weapons payload, conventional submarines are also cheaper to build. The introduction of air-independent propulsion boats, conventional diesel-electric submarines with some kind of auxiliary air-independent electricity generator, have led to increased sales of such types of submarines.

File:Los Angeles Class submarine on surface (approaching view).png

During the Cold War, the United States and the Soviet Union maintained large submarine fleets that engaged in cat-and-mouse games. The Soviet Union suffered the loss of at least four submarines during this period: K-129 was lost in 1968 (which the CIA attempted to retrieve from the ocean floor with the Howard Hughes-designed ship Glomar Explorer), K-8 in 1970, K-219 in 1986, and Komsomolets in 1989 (which held a depth record among military submarines—1000 m). Many other Soviet subs, such as K-19 (the first Soviet nuclear submarine, and the first Soviet sub to reach the North Pole) were badly damaged by fire or radiation leaks. The US lost two nuclear submarines during this time: USS Thresher due to equipment failure during a test dive while at its operational limit, and USS Scorpion due to unknown causes.

During the Indo-Pakistani War of 1971, the Pakistan Navy's Hangor sank the Indian frigate INS Khukri. This was the first kill by a submarine since World War II, and the only one until the United Kingdom employed nuclear-powered submarines against Argentina in 1982 during the Falklands War. The Argentine cruiser General Belgrano was sunk by HMS Conqueror (the first sinking by a nuclear-powered submarine in war). The PNS Ghazi, a Tench class submarine on loan to Pakistan from the US, was sunk in the Indo-Pakistani War. It was the first submarine casualty since World War II during war time.

More recently, Russia has had three high profile submarine accidents. The Kursk went down with all hands in 2000; the K-159 sank while being towed to a scrapyard in 2003, with nine lives lost; and the Nerpa had an accident with the fire-extinguishing system resulting in twenty deaths in late 2008.

Indian Prime Minister Manmohan Singh launched India's first locally built nuclear-powered submarine, the Arihant, on July 26, 2009.<ref>Template:Cite news</ref> "Today, we join a select group of five nations who possess the capability to build a nuclear-powered submarine," Singh stated during a speech at Visakhapatnam naval base.<ref>Singh, Harmeet Shah. "India launches nuclear submarine". CNN, July 26, 2009.</ref>

===Polar Operations===
File:USS Alexandria (SSN 757) surfaced through Artic ice.gif

* 1903 - Simon Lake submarine Protector surfaced through ice off Newport, Rhode Island.<ref name="proceedings">McLaren, Alfred S., CAPT USN "Under the Ice in Submarines" United States Naval Institute Proceedings July 1981 pp.105-109</ref>
* 1930 - USS O-12 (SS-73) operated under ice near Spitsbergen.<ref name="proceedings"/>
* 1937 - Soviet submarine Krasnogvardeyets operated under ice in the Denmark Strait.<ref name="proceedings"/>
* 1941-45 - German U-boats operated under ice from the Barents Sea to the Laptev Sea.<ref name="proceedings"/>
* 1946 - USS Atule (SS-403) used upward-beamed fathometer in Operation Nanook in the Davis Strait.<ref name="proceedings"/>
* 1946-47 - USS Sennet (SS-408) used under-ice SONAR in Operation High Jump in the Antarctic.<ref name="proceedings"/>
* 1947 - USS Boarfish (SS-327) used upward-beamed echo sounder under pack ice in the Chukchi Sea.<ref name="proceedings"/>
* 1948 - USS Carp (SS-338) developed techniques for making vertical ascents and descents through polynyas in the Chukchi Sea.<ref name="proceedings"/>
* 1952 - USS Redfish (SS-395) used an expanded upward-beamed sounder array in the Beaufort Sea.<ref name="proceedings"/>
* 1957 - USS Nautilus (SSN-571) reached 87 degrees north near Spitsbergen.<ref name="proceedings"/>
* 3 August 1958 - Nautilus used an inertial navigation system to reach the north pole.<ref name="proceedings"/>
* 17 March 1959 - USS Skate (SSN-578) surfaced through the ice at the north pole.<ref name="proceedings"/>
* 1960 - USS Sargo (SSN-583) transited 900 miles under ice over the shallow (125 to 180 feet deep) Bering-Chukchi shelf.<ref name="proceedings"/>
* 1960 - USS Seadragon (SSN-584) transited the Northwest Passage under ice.<ref name="proceedings"/>
* 1962 - Soviet November class submarine Leninskiy Komsomol reached the north pole.<ref name="proceedings"/>
* 1971 - HMS Dreadnought (S101) reached the north pole.<ref name="proceedings"/>
* 6 May 1986 - USS Ray (SSN-653), USS Archerfish (SSN-678) and USS Hawkbill (SSN-666) meet and surface together at the Geographic North Pole. First multi-submarine surfacing at the Pole.
* 19 May 1987 - HMS Superb (S109) joined USS Billfish (SSN-676) and  USS Sea Devil (SSN-664) at the North Pole. The first time British and Americans met at the North Pole.
* March 2007 - USS Alexandria (SSN-757) participated in the Joint U.S. Navy/Royal Navy Ice Exercise 2007 (ICEX-2007) in the Arctic Ocean with the Trafalgar class submarine HMS Tireless (S88).

==Modern tourist submarines==

Submarines with a crush depth in the range of Template:Convert are operated in several areas worldwide, typically with bottom depths around Template:Convert, with a carrying capacity of 50 to 100 passengers. In a typical operation (for example, Atlantis submarines), a surface vessel carries passengers to an offshore operating area, where passengers are exchanged with those of the submarine. The submarine then visits underwater points of interests, typically either natural or artificial reef structures. To surface safely without danger of collision the location of the submarine is marked with an air release and movement to the surface is coordinated by an observer in a support craft, this as described to the occupants during operations.

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== See also ==
=== Submarine articles ===
* Autonomous Underwater Vehicle
* Ballistic missile submarine
* Communication with submarines
* Deep Submergence Vehicle
** Deep Submergence Rescue Vehicle
* John Philip Holland
* List of countries with submarines
* List of submarine actions
* List of submarine museums
* List of sunken nuclear submarines
* Merchant submarine
* Submarine navigation
* Submarine warfare
* Submarines in the United States Navy
* Category:Fictional submarines
* Submarine films
* Submarine simulator, a computer game genre
* Wet sub

=== Related topics ===
* Timeline of underwater technology
* Modern Naval tactics
* Nuclear navy
* Submarine communications cable
* Submarine power cable
* Submersible
* Semi-submersible
* Depth charge
* U-boat

=== Articles on specific vessels ===
* Ships named Nautilus
* List of submarines of the Royal Navy
* List of submarines of the United States Navy
* List of Soviet submarines
* Submarines of the Chinese Navy
* Submarines of the French Navy
* List of submarines of the Indian Navy
* List of U-boats

=== Articles on specific submarine classes ===
* List of submarine classes
* List of submarine classes of the Royal Navy
* List of Soviet and Russian submarine classes
* List of United States submarine classes

== Patents ==
* Template:US patent - Submarine boat

== References ==
Template:More footnotes

General Histories of Submarines

* Histoire des sous-marins: des origines à nos jours by Jean-Marie Mathey and Alexandre Sheldon-Duplaix. (Boulogne-Billancourt: ETAI, 2002).

Early Submarines before 1914
* ==Further reading==
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