After losing a submarine and fifty crew in a battle with a German ship during WWII, a Royal Navy officer gets a second chance in a daring raid with midget subs.
Submarine X-1 is a 1968 British war film loosely based on the Operation Source attack on the German battleship Tirpitz in 1943. In the film, James Caan stars as Lt. Commander Richard Bolton, a Canadian, who must lead a group of midget submarines in an attack on a German battleship.