The Silent Enemy

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