Robin Estridge (Screenplay) · Ralph Thomas (Director)
John Mills
Commandant Fraser
John Gregson
Lieutenant Alec Duffy
Donald Sinden
Lieutenant Tom Corbett
James Robertson Justice
Admiral Ryder
Michael Medwin
Smart
Theodore Bikel
German Officer
James Kenney
Abercrombie
William Russell
Ramsey
O.E. Hasse
Captain of the Tirpitz
Lee Patterson
Cox
Harry Towb
McCleery
Cyril Chamberlain
CPO Chubb
Tony Wager
George
Leslie Weston
Winley
Lyndon Brook
Diver Navigator, X2
Thomas Heathcote
Hutchins
Anthony Newley
Engineer, X2
John Horsley
Lt. Anderson
William Franklyn
No. 1, X2
Guido Lorraine
Officer Interpreter
Raymond Francis
Officer on Towing Sub. (1)
Basil Appleby
Officer on Towing Sub. (2)
Walter Gotell
German Officer on Tirpitz
Victor Harrington
RAF Officer (uncredited)
Arthur Howell
German Navy Officer (uncredited)
Barry Keegan
Sailor on Towing Sub (uncredited)
Frank Lawton
Naval Officer in Briefing Room (uncredited)
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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.
