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

Lyndon Brook

Diver Navigator, X2

Thomas Heathcote

Hutchins

Anthony Newley

Engineer, X2

John Horsley

Lt. Anderson

William Franklyn

No. 1, X2

Raymond Francis

Officer on Towing Sub. (1)

Walter Gotell

German Officer on Tirpitz

Frank Lawton

Naval Officer in Briefing Room (uncredited)