Richard Widmark as Capt. Adam Jones

Bella Darvi as Denise Montel

Victor Francen as Prof. Montel

Cameron Mitchell as 'Ski' Brodski

Gene Evans as Chief Holter

David Wayne as Tugboat Walker

Stephen Bekassy as Neuman

Richard Loo as Hakada Fujimori

Robert Adler as Welles (uncredited)

Eugene Borden as French Reporter (uncredited)

Leslie Bradley as Mr. Aylesworth (uncredited)

Henry Kulky as McCrossin (uncredited)

Peter Ortiz as Crewman (uncredited)

Ray Stevens as Crewman (uncredited)

John Wengraf as Col. Schuman (uncredited)

Harry Carter as

Harry Denny as

Frank Kumagai as

Eddie Lee as

Rollin Moriyama as

Don Orlando as

Beal Wong as

Ben Wright as BBC Announcer (uncredited)

Ron Nyman as Lee Sockwell (uncredited)

John Roy as Crewman (uncredited)

Robert B. Williams as Reporter (uncredited)

Cactus Mack as Crewman (uncredited)

Weaver Levy as Asian Man (uncredited)

Robert Kino as Passenger (uncredited)