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1943 - 1946: XT Class

During 1943 and 1944, Vickers built six XT-craft submarines for training purposes. Having an endurance of only 500 miles at 4 knots, the XT-boats were a simplified X5 class submarine without the side cargo-release gear, night periscope or automatic helmsman. In addition, their day periscope, projector compass and air-induction trunk were fixed in the 'up' position.

XT Class General Arrangement
XT Class General Arrangement

Twelve more vessels, ordered in 1943 from Broadbents of Huddersfield, were cancelled before completion. The six Barrow-boats were scrapped at the end of the war.

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1942 - 1946: X Class1943 - 1977: Amphion Class