X Class Submarine - Builders

Builders

The numbering sequence of the X class began with X3 because the designations X1 and X2 had already been used previously - X1 had been a one-off submarine cruiser design from the 1920s while X2 had been assigned to a captured Italian submarine.

  • Prototypes
    • X3 — built by Varley Marine, Hamble, scrapped 1945
    • X4 — built by Portsmouth Dockyard, scrapped 1945
  • X5-type
    • X5 — built by Vickers Armstrong, Barrow-in-Furness, used in Operation Source, scuttled Altenfjord 22 September 1943
    • X6 — built by Vickers, used in Operation Source, scuttled Altenfjord 22 September 1943
    • X7 — built by Vickers, used in Operation Source, scuttled Altenfjord 22 September 1943, salved 1976 for museum restoration
    • X8 — built by Vickers, used in Operation Source, scuttled in North Sea 17 September 1943
    • X9 — built by Vickers, used in Operation Source, foundered under tow in North Sea 15 October 1943 with all hands
    • X10 — built by Vickers, used in Operation Source, scuttled in North Sea 3 October 1943
  • X20-type
    • X20 — built by Broadbent, Huddersfield, used in Operation Gambit
    • X21 — built by Broadbent
    • X22 — built by Markham & Co., Chesterfield, collided with HMS Syrtis and lost with all hands while training February 7, 1944
    • X23 — built by Markham, used in Operation Gambit, sold 1945
    • X24 — built by Marshall, Gainsborough, attacked Laksevåg floating dock at Bergen, hulked 1945
    • X25 — built by Marshall, sold 1945
  • Training craft
    • XT1 — built by Vickers, scrapped 1945
    • XT2 — built by Vickers, scrapped 1945
    • XT3 — built by Vickers, scrapped 1945
    • XT4 — built by Vickers, scrapped 1945
    • XT5 — built by Vickers, scrapped 1945
    • XT6 — built by Vickers, scrapped 1945

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    —Plato (c. 427–347 B.C.)