on Operation Heckle on 11 September 1944, again by X24 which was 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 Surviving examples X24 – the only one to have seen combat and survive is at the Royal Navy Submarine Museum, Gosport The remains of two XT-class craft are present on the beach at Aberlady Bay in East Lothian, Scotland. They were towed there in 1946 and moored to a large concrete block at the low tide level and were used as targets for aircraft. Much of the structure remains, semisubmerged in the sand, and can be reached at low spring tides. In the media This type of midget submarine was portrayed in the 1955 war film, Above Us the Waves, featuring John Mills, which was based on both Operation Source and the earlier Chariot attacks on the Tirpitz. An X-class submarine – marked as "X2" – features in the 1959 film The Giant Behemoth (a.k.a. Behemoth the Sea Monster). This class of submarine was later featured in the 1968 movie Submarine X-1 starring James Caan as a Canadian Royal Naval Volunteer Reserve officer who after losing his submarine and fifty crew members in a battle with a German ship during World War II, gets a second chance training crews to take part in a raid using midget subs. A 2006 Alexander Fullerton novel, The Gatecrashers, features a fictionalized account of X-class midget submarines, including X-12 piloted by one of the protagonists, that lays explosive charges to damage the Tirpitz. See also HM Submarine X1 – World War 1 submarine. HM Submarine X2 – Name given to the Italian Submarine, Galileo Galilei, after she was captured and taken into service by the Royal Navy. XE class submarine – Improved X Class submarine. Stickleback class submarine – Improved XE class submarine, in service in the 1950s. References Bibliography Above Us The Waves by C. E. T. Warren and James Benson - George G. Harrap & Co. LTD - 1953 - Submarines in Colour by Bill Gunston - Blandford Colour Series - Blandford - 1976 - Submarines - The History and Evolution of Underwater Fighting Vessels by Anthony