X-Craft submarines

Four-man, 52 feet long X-craft, complete submarines in miniature, were first laid down in September 1942 with one definite purpose, the destruction of the German battleship Tirpitz

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List of X-Craft

* Prototypes
o X3 — built by Varley Marine, Hamble, scrapped 1945
o X4 — built by Portsmouth Dockyard HMNB Portsmouth
* X5-type
o X5 — built by Vickers Armstrong Vickers Armstrong, Barrow-in-Furness, used in Operation Source, scuttled Altenfjord 22 September 1943
o X6 — built by Vickers, used in Operation Source, scuttled Altenfjord 22 September 1943
o X7 — built by Vickers, used in Operation Source, scuttled Altenfjord 22 September 1943, salved 1976 for museum restoration
o X8 — built by Vickers, used in Operation Source, scuttled in North Sea 17 September 1943
o X9 — built by Vickers, used in Operation Source, foundered under tow in North Sea October 15 1943
o X10 — built by Vickers, used in Operation Source, scuttled in North Sea 3 October 1943
* X20-type
o X20 — built by Broadbent, Huddersfield Huddersfield, used in Operation Gambit
o X21 — built by Broadbent
o X22 — built by Markham, Chesterfield Chesterfield

o X23 — built by Markham, used in Operation Gambit, sold 1945
o X24 — built by Marshall, Gainsborough, attacked Laksevåg, floating dock at Bergen, hulked 1945
o X25 — built by Marshall, sold 1945
* Training craft
o XT1 — built by Vickers, scrapped 1945
o XT2 — built by Vickers, scrapped 1945
o XT3 — built by Vickers, scrapped 1945
o XT4 — built by Vickers, scrapped 1945
o XT5 — built by Vickers, scrapped 1945
o XT6 — built by Vickers, scrapped 1945