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