Générique complet
L'Ennemi silencieux
Laurence Harvey
Lieutenant "Buster" Crabb, R.N.V.R.
Michael Craig
Leading Seaman Knowles
Dawn Addams
Third Officer Jill Masters, W.R.N.S
John Clements
The Admiral
Sidney James
Chief Petty Officer Thorpe
Alec McCowen
Able Seaman Morgan
Nigel Stock
Able Seaman Fraser
Ian Whittaker
Ordinary Seaman Thomas
Arnoldo Foà
Tomolino
Gianna Maria Canale
Conchita
Massimo Serato
Forzenelli
Giacomo Rossi Stuart
Rosati
Carlo Giustini
Fellini
Raymond Young
Celloni
David Lodge
Sergeant
Ewen Solon
Willowdale Captain
Brian Oulton
Holford
Howard Marion-Crawford
Wing Commander
Cyril Shaps
Miguel
Lee Montague
Miguel's Mate
John Lee
Flag Lt.
Terence Longdon
Lt Bailey
Ian MacNaughton
Admiralty Sentry
Alan Webb
British Consul
John Moffatt
Diver
Harold Siddons
Army Interrogation Officer
Michael Brill
Naval Interrogation Officer
Jack May
Navy Doctor
Derren Nesbitt
Patrol Boat Officer
Yvonne Romain
Spanish Girl
Jerome Willis
Sailor
