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