William Holden

Capt. David Ross

Sophia Loren

Stella

Trevor Howard

Capt. Chris Ford

Bernard Lee

Cmdr. Wadlow

Oskar Homolka

Van Dam

Kieron Moore

Kane

Noel Purcell

Hotel Clerk

Bryan Forbes

Weaver

Beatrix Lehmann

Housekeeper

Rupert Davies

Baker

Russell Waters

Sparks

Sidney Vivian

Grogan

Irene Handl

Clerk

John Crawford

American Captain

Jameson Clark

English Captain

Guy Standeven

Policeman (uncredited)

Keith Faulkner

Signalman (uncredited)

Michael Caine

Seaman (uncredited)

Robert Rietti

Dubbing (voice) (uncredited)