X Craft Submarine

Based on the Royal Navy XT Class 1943 - 1946

During 1943 and 1944, Vickers shipyard at Barrow 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.

http://rnsubs.co.uk/boats/subs/xt-class.html

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