
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.
Cast

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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