HMS Tiara (P351) was a Royal Navy Group Three T-class submarine laid down at Portsmouth Dockyard on 8 April 1943 and launched on 18 April 1944. However the war ended before she was completed and she arrived at Dover Industries for scrapping in June 1947. Her sister vessel Thor was launched on the same day at Portsmouth dockyard and not completed either. She would have been the only ship of the Royal Navy to bear the name Tiara.
HMS Upholder (P37) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. She was laid down on 30 October 1939, launched on 8 July 1940 by Mrs. Doris Thompson, wife of a director of the builders. The submarine was commissioned on 31 October 1940. She was one of four U-class submarines which had two external torpedo tubes at the bows in addition to the 4 internal ones fitted to all boats. They were excluded from the others because they interfered with depth-keeping at periscope depth.
HMS Tireless, a Taciturn- or T-class submarine, was the first ship of the Royal Navy to bear that name. She was authorized under the 1941 War Emergency Programme and her keel was laid down on 30 October 1941 at Portsmouth Dockyard. She was launched on 19 March 1943 and was completed on 18 April 1945.
HMS P33 was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.
HMS P32 was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.
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 Tempest (N86) was a T-class submarine of the Royal Navy. She was laid down by Cammell Laird & Co Limited, Birkenhead and launched in June 1941, serving in the Mediterranean theatre until 13 February 1942, when she was sunk by the Regia Marina while on patrol the Gulf of Taranto.
HMS Thorn (N11) was a T-class submarine of the Royal Navy. She was laid down by Cammell Laird & Co Limited, Birkenhead and launched in March 1941.
HMS Traveller (N48) was a T-class submarine of the Royal Navy. She was laid down by Scotts, Greenock and launched in August 1941.
HMS Taurus was a Second World War T-class submarine, built by Vickers Armstrong, Barrow.
HMS Una was a British U-class submarine, of the second group of that class, built at Chatham Dockyard. She was laid down on 7 May 1940 and was commissioned on 27 September 1941.
HMS Unbeaten was a U-class submarine, of the second group of that class, built by Vickers Armstrong, Barrow-in-Furness. She was laid down on 22 November 1939 and was commissioned on 10 November 1940. So far she has been the only ship of the Royal Navy to bear the name Unbeaten.
HMS Undaunted was a British U class submarine, of the second group of that class, built by Vickers Armstrong, Barrow-in-Furness. She was laid down on 2 December 1939 and was commissioned on 30 December 1940.
HMS Unique was a U-class submarine of the Royal Navy, of the second group of that class, built by Vickers Armstrong, Barrow-in-Furness. She was laid down on 30 October 1939 and was commissioned on 27 September 1940.
HMS P36 was a British U class submarine, a member of the third group of that class to be built. She was sunk at the quayside in Malta in 1942, and some of her survivors were shipwrecked again in another submarine less than six weeks later.
HMS Varangian was a British built U class submarine, a member of the third group of that class to be built. The submarine carried out patrols in the Norwegian Sea and was also used in a training role. She was broken up at Gateshead in 1949. Her ship's bell is in the possession of the Royal Navy Submarine Museum in Gosport, United Kingdom.
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 Upstart (P65) 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 Upstart. After the war, she was loaned to the Greek Navy and renamed Amfitriti.
HMS P611 was a submarine of the Oruç Reis class originally built for the Turkish Navy intended to be named Oruç Reis, but commissioned into the Royal Navy after the outbreak of war.
HMS H31 was a British H class submarine built by Vickers Limited, Barrow-in-Furness. She was laid down on 19 April 1917 and was commissioned on 21 February 1919.
United Kingdom
