177 relations: Acoustic homing, Action of 9 February 1945, ACTUV, Admiralty, Aerial torpedo, Aircraft, Airship, Alfred Thayer Mahan, Amatol, American Revolutionary War, Andrew J. May, Anti-submarine indicator loop, Anti-submarine missile, Anti-submarine mortar, Anti-submarine net, Anti-submarine weapon, Attack submarine, Attrition warfare, Autogyro, B57 nuclear bomb, Ballistic missile, Ballistic missile submarine, Bathythermograph, Battle of the Atlantic, Battleship, Belt armor, Bletchley Park, Blimp, Board of Invention and Research, Bomb, Brest, France, British R-class submarine, Buoy, CAM ship, Camouflage, Charles A. Lockwood, Commerce raiding, Compound locomotive, Consolidated B-24 Liberator, Consolidated PBY Catalina, Convoy, Corvette, Countermeasure, County Kerry, Creeping attack, DARPA, Demining, Depth charge, Destroyer, Destroyer escort, ..., Doctrine, East Coast of the United States, Echo sounding, Edward Evans, 1st Baron Mountevans, Electric battery, Electronic countermeasure, Electronic warfare, Enigma machine, Escort carrier, Explosive material, Extremely low frequency, Firth Brown Steels, Flare, Focke-Wulf Fw 200 Condor, Forecastle, Forward-looking infrared, Foxer, Frederic John Walker, Frigate, Galvanometer, German submarine U-864, GIUK gap, Gradient, Greater Underwater Propulsion Power Program, Grumman F6F Hellcat, Gun, Harbor, Hedgehog (weapon), Helicopter, High-frequency direction finding, HMS Excalibur, HMS Explorer (submarine), HMS Meteorite, HMS Perseus (N36), HMS Upholder (P37), HMS Venturer (P68), HMS Vernon (shore establishment), Hydrophone, Hydrostatics, Ikara (missile), Imperial Japanese Navy, Indian Ocean, John Jellicoe, 1st Earl Jellicoe, Kayaba Ka-1, Kyushu Q1W, La Rochelle, Leigh Light, Liberty ship, Lidar, Limbo (weapon), Littoral (military), Lockheed P-3 Orion, Lockheed Ventura, Magnetic anomaly detector, Malta, Maritime patrol aircraft, Mark 24 mine, Merchant aircraft carrier, Metox radar detector, Mid-Atlantic gap, Mk 101 Lulu, Mk 2 mine, Mousetrap (weapon), Naval mine, Naval tactics, Naval tactics in the Age of Steam, Nitrocellulose, Norway, Nuclear depth bomb, Nuclear submarine, Operations research, Operations room, Otto Kretschmer, Patrolling, Periscope, Picric acid, Pyrotechnics, Q-ship, Radar, Ramming, RBU-6000, Rocket (weapon), Room 40, Royal Air Force, Royal Navy, RUR-4 Weapon Alpha, RUR-5 ASROC, Russo-Japanese War, Seaplane, Searchlight, Short Sunderland, Sikorsky SH-60 Seahawk, SM U-68, Sonar, Sonobuoy, SOSUS, Spar torpedo, Squid (weapon), Stokes mortar, Strait of Gibraltar, Submarine, Submarine pen, Submarine snorkel, Thermocline, Thorsten Nordenfelt, TNT, Tonnage war, Torpedo, Towed array sonar, Tupolev Tu-142, Type 23 frigate, Type 95 torpedo, Type B Cipher Machine, Type XVII submarine, Type XXI submarine, U-boat, Ultra, Underwater acoustics, Underwater warfare, Vickers Wellington, Wake homing, Warship, WE.177, Whiskey-class submarine, World War I, World War II, Zulu-class submarine. Expand index (127 more) » « Shrink index
Acoustic homing is a system which uses the acoustic signature (sound) of a target to guide a moving object, such as a torpedo.
The Action of 9 February 1945 refers to the sinking of U-boat in the North Sea off the Norwegian island of Fedje during the Second World War by the Royal Navy submarine HMS ''Venturer''.
The ASW Continuous Trail Unmanned Vessel (ACTUV) is a DARPA funded project launched in early 2010 to develop an anti-submarine drone (unmanned surface vehicle).
The Admiralty, originally known as the Office of the Admiralty and Marine Affairs, was the government department responsible for the command of the Royal Navy firstly in the Kingdom of England, secondly in the Kingdom of Great Britain, and from 1801 to 1964, the United Kingdom and former British Empire.
An aerial torpedo, airborne torpedo or air-dropped torpedo is a naval weapon, a torpedo, that an aircraft—fixed-wing aircraft or helicopter—drops in the water, after which the weapon propels itself to the target.
An aircraft is a machine that is able to fly by gaining support from the air.
An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power.
Alfred Thayer Mahan (September 27, 1840 – December 1, 1914) was a United States naval officer and historian, whom John Keegan called "the most important American strategist of the nineteenth century." His book The Influence of Sea Power Upon History, 1660–1783 (1890) won immediate recognition, especially in Europe, and with its successor, The Influence of Sea Power Upon the French Revolution and Empire, 1793–1812 (1892), made him world-famous and perhaps the most influential American author of the nineteenth century.
Amatol is a highly explosive material made from a mixture of TNT and ammonium nitrate.
The American Revolutionary War (17751783), also known as the American War of Independence, was a global war that began as a conflict between Great Britain and its Thirteen Colonies which declared independence as the United States of America. After 1765, growing philosophical and political differences strained the relationship between Great Britain and its colonies. Patriot protests against taxation without representation followed the Stamp Act and escalated into boycotts, which culminated in 1773 with the Sons of Liberty destroying a shipment of tea in Boston Harbor. Britain responded by closing Boston Harbor and passing a series of punitive measures against Massachusetts Bay Colony. Massachusetts colonists responded with the Suffolk Resolves, and they established a shadow government which wrested control of the countryside from the Crown. Twelve colonies formed a Continental Congress to coordinate their resistance, establishing committees and conventions that effectively seized power. British attempts to disarm the Massachusetts militia at Concord, Massachusetts in April 1775 led to open combat. Militia forces then besieged Boston, forcing a British evacuation in March 1776, and Congress appointed George Washington to command the Continental Army. Concurrently, an American attempt to invade Quebec and raise rebellion against the British failed decisively. On July 2, 1776, the Continental Congress voted for independence, issuing its declaration on July 4. Sir William Howe launched a British counter-offensive, capturing New York City and leaving American morale at a low ebb. However, victories at Trenton and Princeton restored American confidence. In 1777, the British launched an invasion from Quebec under John Burgoyne, intending to isolate the New England Colonies. Instead of assisting this effort, Howe took his army on a separate campaign against Philadelphia, and Burgoyne was decisively defeated at Saratoga in October 1777. Burgoyne's defeat had drastic consequences. France formally allied with the Americans and entered the war in 1778, and Spain joined the war the following year as an ally of France but not as an ally of the United States. In 1780, the Kingdom of Mysore attacked the British in India, and tensions between Great Britain and the Netherlands erupted into open war. In North America, the British mounted a "Southern strategy" led by Charles Cornwallis which hinged upon a Loyalist uprising, but too few came forward. Cornwallis suffered reversals at King's Mountain and Cowpens. He retreated to Yorktown, Virginia, intending an evacuation, but a decisive French naval victory deprived him of an escape. A Franco-American army led by the Comte de Rochambeau and Washington then besieged Cornwallis' army and, with no sign of relief, he surrendered in October 1781. Whigs in Britain had long opposed the pro-war Tories in Parliament, and the surrender gave them the upper hand. In early 1782, Parliament voted to end all offensive operations in North America, but the war continued in Europe and India. Britain remained under siege in Gibraltar but scored a major victory over the French navy. On September 3, 1783, the belligerent parties signed the Treaty of Paris in which Great Britain agreed to recognize the sovereignty of the United States and formally end the war. French involvement had proven decisive,Brooks, Richard (editor). Atlas of World Military History. HarperCollins, 2000, p. 101 "Washington's success in keeping the army together deprived the British of victory, but French intervention won the war." but France made few gains and incurred crippling debts. Spain made some minor territorial gains but failed in its primary aim of recovering Gibraltar. The Dutch were defeated on all counts and were compelled to cede territory to Great Britain. In India, the war against Mysore and its allies concluded in 1784 without any territorial changes.
Andrew Jackson May (June 24, 1875 – September 6, 1959) was a Kentucky attorney, an influential New Deal-era politician, and chairman of the House Military Affairs Committee during World War II, infamous for his rash disclosure of classified naval information that resulted in the loss of 10 American submarines and 800 sailors, and his subsequent conviction for bribery.
An anti-submarine indicator loop was a submerged cable laid on the sea bed and used to detect the passage of enemy submarines.
An anti-submarine missile is a standoff anti-submarine weapon.
Anti-submarine mortars are artillery pieces deployed on ships for the purpose of sinking submarines by a direct hit with a small explosive charge.
An anti-submarine net or anti-submarine boom is a boom placed across the mouth of a harbour or a strait for protection against submarines.
An anti-submarine weapon (ASW) is any one of a number of devices that are intended to act against a submarine and its crew, to destroy (sink) the vessel or reduce its capability as a weapon of war.
An attack submarine or hunter-killer submarine is a submarine specifically designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels.
Attrition warfare is a military strategy consisting of belligerent attempts to win a war by wearing down the enemy to the point of collapse through continuous losses in personnel and materiel.
An autogyro (from Greek αὐτός and γύρος, "self-turning"), also known as a gyroplane or gyrocopter, is a type of rotorcraft that uses an unpowered rotor in free autorotation to develop lift.
The B57 nuclear bomb was a tactical nuclear weapon developed by the United States during the Cold War.
A ballistic missile follows a ballistic trajectory to deliver one or more warheads on a predetermined target.
A ballistic missile submarine is a submarine capable of deploying submarine-launched ballistic missiles (SLBMs) with nuclear warheads.
The bathythermograph, or BT, also known as the Mechanical Bathythermograph, or MBT; is a small torpedo-shaped device that holds a temperature sensor and a transducer to detect changes in water temperature versus depth down to a depth of approximately 285 meters (935 feet).
The Battle of the Atlantic was the longest continuous military campaign in World War II, running from 1939 to the defeat of Germany in 1945.
A battleship is a large armored warship with a main battery consisting of large caliber guns.
Belt armor is a layer of heavy metal armor plated onto or within the outer hulls of warships, typically on battleships, battlecruisers and cruisers, and aircraft carriers.
Bletchley Park was the central site for British (and subsequently, Allied) codebreakers during World War II.
A blimp, or non-rigid airship, is an airship (dirigible) or barrage balloon without an internal structural framework or a keel.
The Board of Invention and Research (BIR) was a British expert-level committee, initiated by the Admiralty of the Royal Navy.
A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy.
Brest is a city in the Finistère département in Brittany.
The R-class submarines were a class of 12 small British diesel-electric submarines built for the Royal Navy during World War I, and were forerunners of the modern attack submarine, in that they were designed specifically to attack and sink enemy submarines, their battery capacity and hull shape being optimized for underwater performance.
A buoy is a floating device that can have many purposes.
CAM ships were World War II-era British merchant ships used in convoys as an emergency stop-gap until sufficient escort carriers became available.
Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see (crypsis), or by disguising them as something else (mimesis).
Charles Andrews Lockwood (May 6, 1890 – June 7, 1967) was a vice-admiral and flag officer of the United States Navy.
Commerce raiding is a form of naval warfare used to destroy or disrupt logistics of the enemy on the open sea by attacking its merchant shipping, rather than engaging its combatants or enforcing a blockade against them.
A compound locomotive is a steam locomotive which is powered by a compound engine, a type of steam engine where steam is expanded in two or more stages.
The Consolidated B-24 Liberator is an American heavy bomber, designed by Consolidated Aircraft of San Diego, California.
The Consolidated PBY Catalina, also known as the Canso in Canadian service, is an American flying boat, and later an amphibious aircraft of the 1930s and 1940s produced by Consolidated Aircraft.
A convoy is a group of vehicles, typically motor vehicles or ships, traveling together for mutual support and protection.
A corvette is a small warship.
A countermeasure is a measure or action taken to counter or offset another one.
County Kerry (Contae Chiarraí) is a county in Ireland.
The creeping attack was an anti submarine measure developed during the Battle of the Atlantic in World War II.
The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military.
Demining or mine clearance is the process of removing land mines from an area, while minesweeping describes the act of detecting mines.
A depth charge is an anti-submarine warfare weapon.
In naval terminology, a destroyer is a fast, maneuverable long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against smaller powerful short-range attackers.
Destroyer escort (DE) was the United States Navy mid-20th-century classification for a warship designed with endurance to escort mid-ocean convoys of merchant marine ships.
Doctrine (from doctrina, meaning "teaching", "instruction" or "doctrine") is a codification of beliefs or a body of teachings or instructions, taught principles or positions, as the essence of teachings in a given branch of knowledge or in a belief system.
The East Coast of the United States is the coastline along which the Eastern United States meets the North Atlantic Ocean.
Echo sounding is a type of sonar used to determine the depth of water by transmitting sound pulses into water.
Admiral Edward Ratcliffe Garth Russell Evans, 1st Baron Mountevans (28 October 1880H. G. Thursfield, ‘Evans, Edward Ratcliffe Garth Russell, first Baron Mountevans (1880–1957)’, rev. Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, Jan 2011. – 20 August 1957), known as "Teddy" Evans, was a British naval officer and Antarctic explorer.
An electric battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as flashlights, smartphones, and electric cars.
An electronic countermeasure (ECM) is an electrical or electronic device designed to trick or deceive radar, sonar or other detection systems, like infrared (IR) or lasers.
Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum or directed energy to control the spectrum, attack of an enemy, or impede enemy assaults via the spectrum.
The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-20th century to protect commercial, diplomatic and military communication.
The escort carrier or escort aircraft carrier (US hull classification symbol CVE), also called a "jeep carrier" or "baby flattop" in the United States Navy (USN) or "Woolworth Carrier" by the Royal Navy, was a small and slow type of aircraft carrier used by the Royal Navy, the Imperial Japanese Navy and Imperial Japanese Army Air Force, and the United States Navy in World War II.
An explosive material, also called an explosive, is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure.
Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths of 100,000 to 10,000 kilometers, respectively.
Firth Brown Steels was initially formed in 1902, when Sheffield steelmakers John Brown & Company exchanged shares and came to a working agreement with neighbouring company Thomas Firth & Sons.
A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion.
The Focke-Wulf Fw 200 Condor, also known as Kurier to the Allies, was a German all-metal four-engined monoplane originally developed by Focke-Wulf as a long-range airliner.
The forecastle (abbreviated fo'c'sle or fo'c's'le) is the upper deck of a sailing ship forward of the foremast, or the forward part of a ship with the sailors' living quarters.
Forward-looking infrared (FLIR) cameras, typically used on military and civilian aircraft, use a thermographic camera that senses infrared radiation.
Foxer was the code name for a British built acoustic decoy used to confuse German acoustic homing torpedoes like the G7 torpedo during the Second World War.
Captain Frederic John Walker, (3 June 1896 – 9 July 1944) (his first name is given as Frederick in the Oxford Dictionary of National Biography and some London Gazette entries) was a Royal Navy officer noted for his exploits during World War II.
A frigate is any of several types of warship, the term having been used for ships of various sizes and roles over the last few centuries.
A galvanometer is an electromechanical instrument used for detecting and indicating electric current.
The German submarine U-864 was a Type IXD2 U-boat of Nazi Germany's Kriegsmarine in World War II.
The GIUK gap is an area in the northern Atlantic Ocean that forms a naval choke point.
In mathematics, the gradient is a multi-variable generalization of the derivative.
The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines.
The Grumman F6F Hellcat is an American carrier-based fighter aircraft of World War II.
A gun is a tubular ranged weapon typically designed to pneumatically discharge projectiles that are solid (most guns) but can also be liquid (as in water guns/cannons and projected water disruptors) or even charged particles (as in a plasma gun) and may be free-flying (as with bullets and artillery shells) or tethered (as with Taser guns, spearguns and harpoon guns).
A harbor or harbour (see spelling differences; synonyms: wharves, haven) is a sheltered body of water where ships, boats, and barges can be docked.
The Hedgehog (also known as an Anti-Submarine Projector) was a forward-throwing anti-submarine weapon that was used during the Battle of the Atlantic in the Second World War.
A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors.
High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II.
HMS Excalibur was the sister ship of, the two submarines being the only high-test peroxide (HTP) powered submarines to be constructed for the Royal Navy.
HMS Explorer was an experimental British submarine based on the captured German high test peroxide (HTP) powered U-boat ''U-1407''.
HMS Meteorite was an experimental U-boat developed in Germany, scuttled at the end of World War II, subsequently raised and commissioned into the Royal Navy.
HMS Perseus was a British built in 1929 and lost in 1941 during the Second World War.
HMS Upholder (P37) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.
HMS Venturer was a Second World War British submarine of the V class.
HMS Vernon was a shore establishment or "stone frigate" of the Royal Navy.
A hydrophone (Ancient Greek ὕδωρ.
Fluid statics or hydrostatics is the branch of fluid mechanics that studies fluids at rest.
The Ikara missile was an Australian ship-launched anti-submarine missile, named after an Australian Aboriginal word for "throwing stick".
The Imperial Japanese Navy (IJN; Kyūjitai: 大日本帝國海軍 Shinjitai: 大日本帝国海軍 or 日本海軍 Nippon Kaigun, "Navy of the Greater Japanese Empire") was the navy of the Empire of Japan from 1868 until 1945, when it was dissolved following Japan's defeat and surrender in World War II.
The Indian Ocean is the third largest of the world's oceanic divisions, covering (approximately 20% of the water on the Earth's surface).
Admiral of the Fleet John Rushworth Jellicoe, 1st Earl Jellicoe, (5 December 1859 – 20 November 1935) was a Royal Navy officer.
The Kayaba Ka-1 and Ka-2 were Japanese autogyros, seeing service during World War II for artillery spotting.
The Kyūshū Q1W Tokai (東海 "Eastern Sea"), was a land-based anti-submarine patrol bomber aircraft developed for the Imperial Japanese Navy in World War II.
La Rochelle is a city in western France and a seaport on the Bay of Biscay, a part of the Atlantic Ocean.
The Leigh Light (abbreviated L/L) was a British World War II era anti-submarine device used in the Battle of the Atlantic.
Liberty ships were a class of cargo ship built in the United States during World War II.
Lidar (also called LIDAR, LiDAR, and LADAR) is a surveying method that measures distance to a target by illuminating the target with pulsed laser light and measuring the reflected pulses with a sensor.
Limbo, or Anti Submarine Mortar Mark 10 (A/S Mk.10), was the final British development of a forward-throwing anti-submarine weapon originally designed during the Second World War.
In military and naval warfare, littoral combat is operations in and around the littoral zone, within a certain distance of shore, including surveillance, mine-clearing and support for landing operations and other types of combat shifting from water to ground, and back.
The Lockheed P-3 Orion is a four-engine turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s.
The Lockheed Ventura is a twin engine medium bomber of World War II, used by United States and British Commonwealth forces in several guises, including maritime patrol.
A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field.
Malta, officially known as the Republic of Malta (Repubblika ta' Malta), is a Southern European island country consisting of an archipelago in the Mediterranean Sea.
A maritime patrol aircraft (MPA), also known as a patrol aircraft, maritime reconnaissance aircraft, or by the older American term patrol bomber, is a fixed-wing aircraft designed to operate for long durations over water in maritime patrol roles — in particular anti-submarine warfare (ASW), anti-ship warfare (AShW), and search and rescue (SAR).
The Mark 24 mine (also known as FIDO or Fido) was a United States air-dropped passive acoustic homing anti-submarine torpedo used during the Second World War against German and Japanese submarines.
A merchant aircraft carrier (also known as a MAC) was a limited-purpose aircraft carrier operated under British and Dutch civilian registry during World War II.
Metox, named after its manufacturer, was a pioneering high-frequency radar warning receiver (RWR) manufactured by a small French company in occupied Paris.
The Mid-Atlantic Gap is a geographical term attributed to an undefended area beyond the reach of land-based RAF Coastal Command antisubmarine (A/S) aircraft during the Battle of the Atlantic in the Second World War.
The Mark 101 Lulu was an airdropped nuclear depth charge developed by the U. S. Navy and the Atomic Energy Commission during the 1950s.
The Mark II mine or A./T.
Mousetrap (ASW Marks 20 and 22) was an anti-submarine rocket used mainly during the Second World War by the U.S. Navy and the U.S. Coast Guard.
A naval mine is a self-contained explosive device placed in water to damage or destroy surface ships or submarines.
Naval tactics is the collective name for methods of engaging and defeating an enemy ship or fleet in battle at sea during naval warfare, the naval equivalent of military tactics on land.
The development of the steam ironclad firing explosive shells in the mid 19th century rendered sailing ship tactics obsolete.
Nitrocellulose (also known as cellulose nitrate, flash paper, flash cotton, guncotton, and flash string) is a highly flammable compound formed by nitrating cellulose through exposure to nitric acid or another powerful nitrating agent.
Norway (Norwegian: (Bokmål) or (Nynorsk); Norga), officially the Kingdom of Norway, is a unitary sovereign state whose territory comprises the western portion of the Scandinavian Peninsula plus the remote island of Jan Mayen and the archipelago of Svalbard.
A nuclear depth bomb is the nuclear equivalent of the conventional depth charge, and can be used in anti-submarine warfare for attacking submerged submarines.
A nuclear submarine is a submarine powered by a nuclear reactor.
Operations research, or operational research in British usage, is a discipline that deals with the application of advanced analytical methods to help make better decisions.
The Operations Room (also known as the Combat Information Center (CIC), or, under the British system, the Action Information Centre) is the tactical center of a warship or AWAC aircraft providing processed information for command and control of the near battlespace or 'area of operations'.
Otto Kretschmer (1 May 1912 – 5 August 1998) was the most successful German U-boat commander in the Second World War and later an admiral in the Bundesmarine.
Patrolling is a military tactic.
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.
Picric acid is an organic compound with the formula (O2N)3C6H2OH.
Pyrotechnics is the science of using materials capable of undergoing self-contained and self-sustained exothermic chemical reactions for the production of heat, light, gas, smoke and/or sound.
Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with concealed weaponry, designed to lure submarines into making surface attacks.
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
In warfare, ramming is a technique used in air, sea, and land combat.
The RBU-6000 Smerch-2 (Реактивно-Бомбовая Установка, Reaktivno-Bombovaja Ustanovka; reaction engine-bomb installation & Смерч; waterspout) is a 213 mm caliber Soviet anti-submarine weapon rocket launcher.
A rocket is a self-propelled, unguided weapon system powered by a rocket motor.
In the history of cryptanalysis, Room 40, also known as 40 O.B. (Old Building) (latterly NID25) was the section in the British Admiralty most identified with the British cryptanalysis effort during the First World War, in particular the interception and decoding of the Zimmermann Telegram which played a role in bringing the United States into the War.
The Royal Air Force (RAF) is the United Kingdom's aerial warfare force.
The Royal Navy (RN) is the United Kingdom's naval warfare force.
The RUR-4 "Weapon Alpha" (originally Weapon Able) was an American naval ahead-throwing ASW rocket launcher.
The RUR-5 ASROC (for "Anti-Submarine ROCket") is an all-weather, all sea-conditions anti-submarine missile system.
The Russo–Japanese War (Russko-yaponskaya voina; Nichirosensō; 1904–05) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and Korea.
A seaplane is a powered fixed-wing aircraft capable of taking off and landing (alighting) on water.
A searchlight (or spotlight) is an apparatus that combines an extremely luminous source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction, usually constructed so that it can be swiveled about.
The Short S.25 Sunderland was a British flying boat patrol bomber, developed and constructed by Short Brothers for the Royal Air Force (RAF).
The Sikorsky SH-60/MH-60 Seahawk (or Sea Hawk) is a twin turboshaft engine, multi-mission United States Navy helicopter based on the United States Army UH-60 Black Hawk and a member of the Sikorsky S-70 family.
SM U-68 was a Type U 66 submarine or U-boat for the German Imperial Navy (Kaiserliche Marine) during the First World War.
Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
A sonobuoy (a portmanteau of sonar and buoy) is a relatively small buoy (typically, in diameter and long) expendable sonar system that is dropped/ejected from aircraft or ships conducting anti-submarine warfare or underwater acoustic research.
SOSUS, an acronym for sound surveillance system, is a chain of underwater listening posts located around the world in places such as the Atlantic Ocean near Greenland, Iceland and the United Kingdom—the GIUK gap—and at various locations in the Pacific Ocean.
A spar torpedo is a weapon consisting of a bomb placed at the end of a long pole, or spar, and attached to a boat.
Squid was a British World War II ship-mounted anti-submarine weapon.
The Stokes mortar was a British trench mortar invented by Sir Wilfred Stokes KBE that was issued to the British, Empire and U.S. armies, as well as the Portuguese Expeditionary Corps (CEP), during the later half of the First World War.
The Strait of Gibraltar (مضيق جبل طارق, Estrecho de Gibraltar) is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Gibraltar and Peninsular Spain in Europe from Morocco and Ceuta (Spain) in Africa.
A submarine (or simply sub) is a watercraft capable of independent operation underwater.
A submarine pen (U-Boot-Bunker in German) is a type of submarine base that acts as a bunker to protect submarines from air attack.
A submarine snorkel is a device which allows a submarine to operate submerged while still taking in air from above the surface.
A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake) or air (such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
Thorsten Nordenfelt (1 May 1842 – 18 August 1920), was a Swedish inventor and industrialist.
Trinitrotoluene (TNT), or more specifically 2,4,6-trinitrotoluene, is a chemical compound with the formula C6H2(NO2)3CH3.
A tonnage war is a military strategy aimed at merchant shipping.
A modern torpedo is a self-propelled weapon with an explosive warhead, launched above or below the water surface, propelled underwater towards a target, and designed to detonate either on contact with its target or in proximity to it.
A towed array sonar is a system of hydrophones towed behind a submarine or a surface ship on a cable.
The Tupolev Tu-142 (Туполев Ту-142; NATO reporting name: Bear F/J) is a maritime reconnaissance and anti-submarine warfare (ASW) aircraft derived from the Tu-95 turboprop strategic bomber.
The Type 23 frigate or Duke-class is a class of frigate built for the United Kingdom's Royal Navy.
The Type 95 torpedo was a torpedo of the Imperial Japanese Navy.
In the history of cryptography, "System 97 Typewriter for European Characters" or "Type B Cipher Machine", codenamed Purple by the United States, was a diplomatic cryptographic machine used by the Japanese Foreign Office just before and during World War II.
The Type XVII U-boats were small coastal submarines that used Hellmuth Walter's high-test peroxide propulsion system, which offered a combination of air-independent propulsion and high submerged speeds.
Type XXI U-boats were a class of German diesel-electric Elektroboot (German: "electric boat") submarines designed during the Second World War.
U-boat is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, literally "undersea boat".
Ultra was the designation adopted by British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School (GC&CS) at Bletchley Park.
Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries.
Underwater warfare is one of the three operational areas of naval warfare, the others being surface warfare and aerial warfare.
The Vickers Wellington was a British twin-engined, long-range medium bomber.
Wake homing is a technique used to guide torpedoes to their target.
A warship is a naval ship that is built and primarily intended for naval warfare.
The WE.177, originally styled as WE 177, and sometimes simply as WE177, was a series of tactical and strategic nuclear weapons equipping the Royal Navy (RN) and the Royal Air Force (RAF).
Whiskey-class submarines (known in the Soviet Union as Projects 613, 644, and 665) are a class of naval submarines that the Soviet Union built in the early Cold War period.
World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.
The Soviet Navy's Project 611 (NATO reporting name: Zulu class) were one of the first Soviet post-war attack submarines.