HMS Trident was a British T class submarine built by Cammell Laird, Birkenhead. She was laid down on 12 January 1937 and was commissioned on 1 October 1939. HMS Trident was part of the first group of T class submarines.
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 Storm was an S-class submarine of the Royal Navy, and part of the third group built of that class. She was built by Cammell Laird and launched on 18 May 1943. So far, she is the only RN ship to bear the name Storm.
HMS Sibyl 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 Cammell Laird and launched on 29 April 1942.
HMS Solent was a S-class submarine built by Cammell Laird and launched on 8 June 1944 of the third batch built for the Royal Navy during World War II. She spent most of her career in the Pacific Far East, often in company with her sister ship, HMS Sleuth. Together they sank fifteen Japanese sailing vessels and the Japanese auxiliary minesweeper Wa 3. She survived the war and was sold for scrap in 1961.
HMS Stubborn was an S-class submarine of the Royal Navy, and part of the Third Group built of that class. She was built by Cammell Laird and launched on 11 November 1942. So far she has been the only ship of the Royal Navy to bear the name Stubborn.
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 Truant (N68) was a T-class submarine of the Royal Navy. She was laid down by Vickers Armstrong, Barrow and launched on 5 May 1939.
HMS Torbay (N79) was a T-class submarine of the Royal Navy. She was laid down at Chatham Dockyard and launched on 9 April 1940.
HMS Terrapin was a British submarine of the third group of the T class. She was built as P323 by Vickers Armstrong, Barrow and launched on 31 August 1943. So far she has been the only ship of the Royal Navy to bear the name Terrapin, after the animal of that name. Apart from a brief period in home waters off the Scandinavian coast, Terrapin served in the Far East for much of her wartime career.
HMS Tactician was a British submarine of the third group of the T class. She was built as P314 by Vickers-Armstrongs, Barrow, and launched on 29 July 1942.
HMS Ultor (P53) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness, launched in 1942, and part of the third group of the class. So far she has been the only ship of the Royal Navy to bear the name Ultor.
HMS Universal (P57) was a Royal Navy U-class submarine built by Vickers-Armstrong at Newcastle upon Tyne. So far she has been the only ship of the Royal Navy to bear the name Universal.
HMS Unrivalled (P45) was a U-class submarine built for the Royal Navy during World War II. The boat has been the only ship of the Royal Navy to ever bear the name Unrivalled. Completed in 1942, the boat spent most of the war in the Mediterranean. She sank a number of small merchant ships and naval auxiliaries, but major success eluded her during the war. Too small and slow for the post-war environment, Unrivalled was scrapped in 1946.
HMS Unruffled was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. So far she has been the only ship of the Royal Navy to bear the name Unruffled.
HMS Unswerving (P63) was a Royal Navy U-class submarine built by Vickers-Armstrong. So far she has been the only ship of the Royal Navy to bear the name Unswerving.
HMS Untiring (P59) was a Royal Navy U-class submarine built by Vickers-Armstrong. So far she has been the only ship of the Royal Navy to bear the name Untiring. After the war, she was loaned to the Greek Navy and renamed Xifias (Y-10).
HMS Uproar (P31) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. So far she has been the only ship of the Royal Navy to bear the name Uproar. She was originally named P 31, renamed Ullswater in February 1943 and finally renamed Uproar in April 1943.
HMS Usurper (P56) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. So far she has been the only ship of the Royal Navy to bear the name Usurper.
HMS P47 was a Royal Navy U-class submarine built by Vickers-Armstrong. She was transferred to the Royal Netherlands Navy before completion and renamed HNLMS Dolfijn.
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