Group One Boats
These fifteen pre-war submarines were ordered under the Programmes of 1935 (Triton), 1936 (next four), 1937 (next seven) and 1938 (last three). The boats originally had a bulbous bow covering the two forward external torpedo tubes, which quickly produced complaints that they reduced surface speed in rough weather. These external tubes were therefore removed from Triumph during repairs after she was damaged by a mine and Thetis during the extensive repairs following her sinking and subsequent salvage. Only six survived the war, less than half.
- Triton (sunk in the Adriatic on 18 December 1940)
- Thetis (sank during trials, was salvaged and recommissioned as Thunderbolt; sunk by the Italian corvette Cicogna off Messina Strait on 14 March 1942)
- Tribune
- Trident
- Triumph (lost, probably to Italian mines, on 14 January 1942)
- Taku
- Tarpon (probably sunk by German minesweeper M-6 on 14 April 1940)
- Thistle (torpedoed by U-4 on 10 April 1940)
- Tigris (probably sunk by German ship UJ-2210 on 27 February 1943)
- Triad (sunk by gunfire from the Italian submarine Enrico Toti in the Gulf of Taranto on 15 October 1940)
- Truant
- Tuna
- Talisman (lost, probably to Italian mines, on 17 September 1942)
- Tetrarch, the only boat completed with mine laying equipment (lost, probably to Italian mines, on 2 November 1941)
- Torbay
Read more about this topic: British T Class Submarine
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