• 
  Bryan Forbes

  scenarist

• 
  Christopher Lee

  Submarine Commander Grieves
• 
  Trevor Howard

  Capitanul Thompson
• 
  Anthony Newley

  Clarke
• 
  Peter Arne

  Marine Stevens
• 
  José Ferrer

  Major Stringer
• 
  Victor Maddern

  Sgt. Craig
• 
  Karel Stepanek

  Assistant Gestapo Officer

• 
  Walter Fitzgerald

  Gestapo Comdt.
• 
  Andreas Malandrinos

  French Fisherman
• 
  Dora Bryan

  Myrtie
• 
  Sydney Tafler

  Poliţist
• 
  Gladys Henson

  Barmaid
• 
  Percy Herbert

  Marine Lomas
• 
  Patric Doonan

  Marine Claridge

• 
  John Van Eyssen

  Marine Bradley
• 
  Beatrice Campbell

  Mrs. Ruddock
• 
  Robert Desmond

  Marine Todd
• 
  John Fabian

  Marine Cooney
• 
  David Lodge

  Marine Ruddock
• 
  Graham Stewart

  Marine Booth