Trevor Howard

Captain Thompson

José Ferrer

Major Stringer

Anthony Newley

Marine Clarke

Victor Maddern

Sgt. Craig

Percy Herbert

Marine Lomas

David Lodge

Marine Ruddock

Peter Arne

Marine Stevens

Graham Stewart

Marine Booth

John Fabian

Marine Cooney

John Van Eyssen

Marine Bradley

Robert Desmond

Marine Todd

Walter Fitzgerald

Gestapo Comdt.

Karl Stepanek

Assistant Gestapo Officer

Dora Bryan

Myrtie

Beatrice Campbell

Mrs Ruddock

Sydney Tafler

Policeman

Christopher Lee

Submarine Commander Alan Grieves

Pat McGrath

Marine Bellamy (uncredited)