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