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