Marlon Brando
Robert Crain
Yul Brynner
Captain Müller
Janet Margolin
Esther
Trevor Howard
Colonel Statter
Martin Benrath
Kruse
Hans Christian Blech
Donkeyman
Wally Cox
Dr. Ambach
Rainer Penkert
Milkereit
William Redfield
Baldwin
Oscar Beregi Jr.
Admiral (as Oscar Beregi)
Martin Brandt
Nissen
Carl Esmond
Busch
Martin Kosleck
Wilke
Norbert Schiller
Steward
Ivan Triesault
Lt. Brandt
Eric Braeden
Radio Officer (uncredited)
Jim Goodwin
Merchant Marine (uncredited)
Gregg Barton
Merchant Marine (uncredited)
Paul Baxley
Crew Member (uncredited)
Gene Dynarski
Merchant Marine (uncredited)
Horst Ebersberg
Crew Member (uncredited)
Roy Jenson
Merchant Marine (uncredited)
Buck Kartalian
Merchant Marine (uncredited)
Max Haufler
Branner
Charles De Vries
Kurz
Rick Traeger
Schultz
Robert Sorrells
Koeniger
Frank London
Merchant Marine (uncredited)
Hal Bokar
Merchant Marine (uncredited)
Heinz Brinkmann
Crew Member (uncredited)
Harold Dyrenforth
Cornelson, Ingo Navigator (uncredited)
Fritz Ford
Crew Member (uncredited)
Harold Goodwin
Merchant Marine (uncredited)
Sam Javis
Merchant Marine (uncredited)
Robert Kino
Capt. Hatsuma (uncredited)
Manfred Lating
Lutz (uncredited)