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.
John Mills
John Gregson
Donald Sinden
James Robertson Justice
Michael Medwin
Theodore Bikel
James Kenney
William Russell
O.E. Hasse
Lee Patterson
Harry Towb
Cyril Chamberlain
Tony Wager
Leslie Weston
Lyndon Brook
Thomas Heathcote
Anthony Newley
John Horsley
William Franklyn
Guido Lorraine
Raymond Francis
Basil Appleby
Walter Gotell
Victor Harrington
Arthur Howell
Barry Keegan
Frank Lawton