When a handful of British volunteers were pitted against the might of the German battleship Tirpitz in 1943, official records described the raid as the most daring attack of the war. Four-man X-class midget submarines battled for 11 days across arctic seas to the supposedly impregnable Norwegian fjord where Germany's biggest ship awaited them.
While crew from two of the vessels survived, mystery has always surrounded the role of the X5's team. A group of divers seek to reveal the story of these unsung heroes. Narrated by Michael Praed.
Director James Hayes ; Editor John Farren