HMS Sceptre (P215) was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in April 1943, she spent the majority of her career in the North Sea, off Norway. After an uneventful patrol, the submarine participated in Operation Source, an attack on German battleships in Norway using small midget submarines to penetrate their anchorages and place explosive charges. However, the midget submarine that she was assigned to tow experienced technical difficulties and the mission was aborted. During her next four patrols, Sceptre attacked several ships, but only succeeded in severely damaging one. She was then ordered to tow the submarine X24, which was to attack a floating dry dock in Bergen. The operation, codenamed Guidance, encountered difficulties with the attacking submarine's charts, and the explosives were laid on a merchant ship close to the dock instead. The dock was damaged and the ship sunk, and X24 was towed back to England. Sceptre then conducted a patrol in the Bay of Biscay, sinking two German merchant ships, before being reassigned to tow X24 to Bergen again. The operation was a success, and the dry dock was sunk.
HMS Seraph was an S-class submarine built for the Royal Navy during the Second World War. Completed in 1942, she carried out multiple intelligence and special operations activities during World War II, the most notable of which was Operation Mincemeat.
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 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 P48 was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. Commissioned on 18 June 1942, she spent most of her career in the Mediterranean Sea.
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 Starfish was a first-batch S-class submarine built for the Royal Navy during the 1930s. Completed in 1933, she participated in the Second World War.
HMS Stonehenge was an S-class submarine of the third batch built for the Royal Navy during World War II. Completed in 1943, she made her initial patrol off Norway and was then transferred to the Far East, where she conducted two war patrols, during which she sank two Japanese ships. On her second patrol, Stonehenge disappeared with all hands and was declared overdue on 20 March 1944. The most probable cause of her sinking is that she hit a mine, but her wreck has never been found.
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 Stratagem was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in 1943, she made her first war patrol off Norway before she was sent to the Far East, where she conducted three war patrols. On her second, she shelled installations on a Japanese-held island. Her only success came on her last patrol, when she torpedoed and sank a Japanese oil tanker. Soon after, she was spotted by aircraft and depth charged by a destroyer. She was forced to surface, and was scuttled to prevent her capture. Ten crew members escaped the sinking submarine and were taken prisoner, of whom only three survived the war.
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 Simoom was a third-batch S-class submarine built for the Royal Navy during World War II. She was laid down on 14 July 1941 and launched on 12 October 1942.
HMS Saracen was a third-batch S-class submarine built for the Royal Navy during the Second World War. Completed in 1942, Saracen conducted a patrol in the North Sea where she sank a German U-boat. She was then assigned to the 10th Submarine Flotilla in Malta, from where she made three patrols; on her second, she sank an Italian submarine. Saracen was then reassigned to the 8th Submarine Flotilla, based in Algiers, French North Africa.
HMS Sahib was a third-batch S-class submarine built for the Royal Navy during the Second World War. She was launched on 19 January 1942 and commissioned on 13 May 1942. She was the only British naval vessel to bear the name Sahib.
HMS Sea Rover was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in July 1943, she conducted one war patrol off Norway, before being re-assigned to the Pacific theater. Arriving in February 1944, the boat conducted several patrols in the Strait of Malacca, sinking one transport, one gunboat, one merchant, three sailing vessels, two coasters, and one lighter. During this time, she was attacked several times by aircraft and surface ships; in one attack, she took on two tons of water from leaks caused by depth charges. Sea Rover collided with an Australian corvette in December 1944, and she was sent back to England, then the United States, for repairs. After the war ended, the boat was sent back to England, placed in reserve, then sold for scrap in October 1949.
HMS Seadog was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in September 1942, she spent most of her career in Arctic waters, off Norway, but sank only one German ship in 13 patrols. In January 1945, she was redeployed to the Far East, meeting more success. On her first patrol in the area, the submarine rescued four American airmen. After two patrols, she and her sister ship HMS Shalimar sank five sailing vessels, two coasters, a barge, a tugboat and a Japanese tank landing ship. After the war ended, Seadog was sent back to England, placed in reserve, then sold for scrap in December 1947. She was ultimately broken up in August 1948.
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 Sportsman was a third-batch S-class submarine built for the Royal Navy during World War II. Completed in 1942, she spent most of the war serving in the Mediterranean Sea. After an initial patrol off Norway, she sank the heavy transport Général Bonaparte in the Mediterranean in 1943 and missed a French oil tanker. She was heavily damaged after a mistaken attack by an Allied bomber, and was sent east after repairs to participate in operations in the Black Sea. After the operation was cancelled, Sportsman patrolled the Aegean Sea, sending several Greek and German ships to the bottom. She sank the German transport SS Petrella in early 1944 despite it being clearly marked as a prisoner-of-war ship, killing 2,670 out of 3,173 Italians aboard. Sportsman sank several more ships, and suffered minor damage when she was detected and sighted while attempting to attack a convoy.
HMS P222 was a third-batch S-class submarine built for the Royal Navy during World War II. Commissioned in 1942, the boat had an uneventful first war patrol in the Alboran Sea. She intercepted the Vichy French merchant ship SS Mitidja in July, then provided protection for an Allied convoy to Malta in Operation Pedestal the next month. The navy intended that she was to be sighted on the surface by enemy aircraft to discourage potential attacks by surface warships. Though P222 did not encounter enemy forces, the convoy arrived at its destination on 15 August after sustaining severe losses. She then reconnoitred along the coast of Algeria in advance of Operation Torch, and was attacked by a French patrol ship, but sustained no damage.
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