Gary Cooper as Gideon Patch

Charlton Heston as John Sands

Michael Redgrave as Mr. Nyland

Virginia McKenna as Janet Taggart

Richard Harris as Higgins

Emlyn Williams as Sir Wilfred Falcett

Alexander Knox as Petrie

Cecil Parker as Inquiry Chairman

Ben Wright as Mike Duncan

Peter Illing as Gunderson

John Le Mesurier as Attorney

Noel Drayton as Charlie Bell

John Dearth as Reporter

Paul Bryar as Port Official (uncredited)

Albert Carrier as Ambulance Attendant (uncredited)

Louis Mercier as Commander of Police (uncredited)

Ron Nyman as Seaman (uncredited)

Lomax Study as Photographer (uncredited)