Lieutenant "Buster" Crabb, R.N.V.R.

Laurence Harvey

Leading Seaman Sid Knowles

Michael Craig

Third Officer Jill Masters, W.R.N.S.

Dawn Addams

Conchita

Gianna Maria Canale

The Admiral

John Clements

Naval Interrogation Officer

Michael Brill

Chief Petty Officer Thorpe

Sidney James

Able Seaman Morgan

Alec McCowen

Able Seaman Fraser

Nigel Stock

Ordinary Seaman Thomas

Ian Whittaker

Tomolino

Arnoldo Foà

Forzellini

Massimo Serato

Rosati

Giacomo Rossi-Stuart

Fellini

Carlo Giustini

Celloni

Raymond Young

Wing Commander

Howard Marion-Crawford

Sergeant

David Lodge

Willowdale Captain

Ewen Solon

Miguel

Cyril Shaps

Miguel's Mate

Lee Montague

Holford

Brian Oulton

Lt. Bailey

Terence Longdon

British Consul

Alan Webb

Driver Volunteer

John Moffatt

Cruiser Captain

Sydney King

Flag Lieutenant

John Lee

Helmsman

Peter Welch

Tattooed Sailor

Murray Kash

Sentry outside Admiral's Office

Ian MacNaughton

Spanish Girl

Yvonne Romain

Army Interrogation Officer

Harold Siddons

(uncredited)

Jack May

(uncredited)

Derren Nesbitt

Sailor

Jerome Willis

(uncredited)

Hugh Moxey

(uncredited)

Desmond Jordan

Tom Watson

(uncredited)

Laurence Brooks

Johnny Lee