Bruce Bennett
— Archie Gibbs
Erik Rolf
— Kapitaen Ganz, The U-Boat Captain
John Abbott
— Alfonse Lamont
John Wengraf
— Gunther Rudehoff, Gestapo Agent
Robert B. Williams
— Destroyer Commander Tom Bristol
Trevor Bardette
— Convoy Ship Commander (uncredited)
Anthony Caruso
— Benny, Seaman's Union Hall Man (uncredited)
Eric Feldary
— Hans Braustig, Injured Sailor (uncredited)
Ray Teal
— C.P.O. Shaw (uncredited)