Gary Cooper
Gideon Patch
Charlton Heston
John Sands
Michael Redgrave
Mr. Nyland
Virginia McKenna
Janet Taggart
Richard Harris
Higgins
Emlyn Williams
Sir Wilfred Falcett
Alexander Knox
Petrie
Cecil Parker
Inquiry Chairman
Ben Wright
Mike Duncan
Peter Illing
Gunderson
John Le Mesurier
Attorney
Noel Drayton
Charlie Bell
John Dearth
Reporter
Paul Bryar
Port Official (uncredited)
Albert Carrier
Ambulance Attendant (uncredited)
Louis Mercier
Commander of Police (uncredited)
Ron Nyman
Seaman (uncredited)