The Mediterranean, 1941/42 - Axis forces are using frogmen and manned torpedoes to attack previously impregnable harbours. The Allied forces need to come up with something to answer this threat, which they find in the form of Lt. Lionel "Buster" Crabb.
Laurence Harvey
as Lieutenant "Buster" Crabb, R.N.V.R.
Michael Craig
as Leading Seaman Knowles
Dawn Addams
as Third Officer Jill Masters, W.R.N.S
John Clements
as The Admiral
Sid James
as Chief Petty Officer Thorpe
Alec McCowen
as Able Seaman Morgan
Nigel Stock
as Able Seaman Fraser
Ian Whittaker
as Ordinary Seaman Thomas
Arnoldo Foà
as Tomolino
Gianna Maria Canale
as Conchita
Massimo Serato
as Forzenelli
Giacomo Rossi Stuart
as Rosati
