HMS Seahorse was a first-batch S-class submarine built for the Royal Navy during the 1930s. Ordered in March 1931, she was laid down at Chatham Dockyard in September 1931 and launched on 15 November 1932.
HMS Swordfish (61S) was a first-batch S-class submarine built for the Royal Navy during the 1930s. Commissioned in 1932, she was given the pennant number 61S and was assigned to the 2nd Submarine Flotilla.
HMS Safari was a third batch S-class submarine built for the Royal Navy during World War II. Commissioned in 1942, she was assigned to operate in the Mediterranean Sea. During the course of the war, Safari sank twenty-five ships, most of which were Italian.
HMS Spiteful was a third-batch S-class submarine built for the Royal Navy during the Second World War.
HMS Salmon was a second-batch S-class submarine built during the 1930s for the Royal Navy. Completed in 1935, the boat fought in the Second World War. Salmon is one of twelve boats named in the song "Twelve Little S-Boats".
HMS P48 was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. Commissioned on 18 June 1942, Vickers arranged for the wife of serving submarine Captain, Alister Mars of HMS Unbroken, Ting Mars and Commander of the cruiser Jamaica to officially launch P.48 at Barrow dockyard.
HMS Sturgeon was an S-class submarine that entered service with the Royal Navy in 1932. Ordered in 1930, she was laid down at Chatham Dockyard in January 1931 and launched on 8 January 1932. Commissioned on 27 February 1933, Sturgeon was assigned to the 2nd Submarine Flotilla.
HMS Splendid was a third-batch S-class submarine built for the Royal Navy during World War II. She was laid down on 7 March 1941 and launched on 19 January 1942. After an initial patrol through the Bay of Biscay to Gibraltar, Splendid conducted two patrols in the Mediterranean Sea; one was abandoned after technical problems and on the other she sank two Italian ships. On her next patrol, the submarine attacked two Italian convoys, sinking an Italian destroyer in the second attack. Based in Algiers, the boat operated north of Sicily, sinking six Italian ships, including two tankers and two heavy merchant ships. Splendid was detected by a German destroyer on 21 April 1943 while patrolling off Naples, Italy; the submarine was attacked with depth charges by the destroyer and forced to surface, after which she was scuttled and her surviving crew members taken prisoner. She was the most successful British submarine by tonnage sunk between November 1942 and May 1943.
HMS Sickle was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in 1942, she made her initial war patrol off the Norwegian coast. Sickle then sailed to Gibraltar, from where she conducted one patrol, then to Algiers, French North Africa. From 10 May to 10 October, the boat patrolled the Gulf of Genoa five times and sank a German submarine as well as three minesweepers and an escort ship. She then moved to Beirut, French Lebanon, and conducted two patrols in the Aegean Sea, sinking three caïques and a merchant ship, in addition to landing resistance operatives in Greece.
HMS Syrtis was a third-batch S-class submarine built for the Royal Navy during the Second World War. Completed in 1943, Syrtis spent most of her career in the Arctic, off Norway, other than a single patrol in the Bay of Biscay,
HMS Shakespeare was an S-class submarine built for the Royal Navy during the Second World War, and part of the Third Group built of that class. She was built by Vickers-Armstrongs and launched on 8 December 1941.
HMS Shalimar was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in April 1944, she conducted one war patrol off the Orkney Islands, then was assigned to the Pacific theater, arriving there in September. The submarine conducted one war patrol off the Nicobar Islands, destroying several small ships with gunfire. During her next three patrols in the Strait of Malacca, Shalimar sank twelve sailing vessels, eleven landing craft, four coasters, three lighters, three tugboats, and one minesweeper. After the war ended, the boat was sent back to England, placed in reserve, then sold for scrap in July 1950.
HMS Supreme was a S-class submarine of the third batch built for the Royal Navy during World War II. She survived the war and was sold for scrap in 1950.
HMS Sterlet was a second-batch S-class submarine built during the 1930s for the Royal Navy. Completed in 1938, the boat fought in the Second World War. The submarine is one of the 12 boats named in the song Twelve Little S-Boats. Thus far she has been the only ship of the Royal Navy to be named Sterlet.
HMS Snapper was a second-batch S-class submarine built during the 1930s for the Royal Navy. Completed in 1935, the boat participated in the Second World War. Snapper is one of the 12 boats named in the song "Twelve Little S-Boats".
HMS Seawolf was a second-batch S-class submarine built during the 1930s for the Royal Navy. Completed in 1936, the boat fought in the Second World War.
HMS L27 was a L-class submarine built for the Royal Navy during World War I. The boat was not completed before the end of the war and was one of three L-class boats to serve during World War II. She served as training boat before being broken up in 1944.
German submarine U-209 was a Type VIIC U-boat of the Kriegsmarine during World War II. The submarine was laid down on 28 November 1940 by the Friedrich Krupp Germaniawerft yard at Kiel as yard number 638, launched on 28 August 1941 and commissioned on 11 October under the command of Kapitänleutnant Heinrich Brodda.
Ro-49 was an Imperial Japanese Navy Kaichū type submarine of the K6 sub-class. Completed and commissioned in May 1944, she served in World War II and patrolled off the Philippines and the Ryukyu Islands. She was lost during her third war patrol sometime in late March or April 1945.
Ro-111 was an Imperial Japanese Navy Ro-100-class submarine. Completed and commissioned in July 1943, she served in World War II, operating in the Indian Ocean — where she sank a cargo ship and a troopship — and off the Admiralty Islands in the Pacific Ocean. She was sunk in June 1944 during her fifth war patrol.
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