![Theodore Bikel](http://image.tmdb.org/t/p/w92/haW3rcL6VM0EtwF7kZFSLgWfdys.jpg)
In World War II, the greatest threat to the British navy is the German battleship Tirpitz. While anchored in a Norwegian fjord, it is impossible to attack by conventional means, so a plan is hatched for a special commando unit to attack it, using midget submarines to plant underwater explosives.