Robert Mitchum as Capt. Murrell

Curd Jürgens as Kapitän von Stolberg

David Hedison as Lt. Ware

Theodore Bikel as Heinie Schwaffer

Russell Collins as Doctor

Kurt Kreuger as Von Holem (uncredited)

Frank Albertson as Lt. J.G. Crain

Biff Elliot as Quartermaster

Michael McHale as German Soldier

Alan Dexter as Lt. Mackeson

Joe Di Reda as BMSN Robbins

Robert Boon as Chief Engineer

Doug McClure as Ens. Merry (uncredited)

Joe Brooks as German Soldier

George Ford as Officer (uncredited)

Sasha Harden as German Sailor

Ralph Manza as Lt. Bonelli (uncredited)

Gordon Mitchell as German Sailor

Marco López as Soldier (uncredited)

Vince Deadrick Sr. as American Sailor (uncredited)

Marco Lopez as Soldier (uncredited)

Hans Moebus as Sailor (uncredited)

Ralph Reed as Fireman (uncredited)