"After losing a submarine and fifty crew in a battle with a German ship during WWII, a Royal Navy officer gets a second chance in a daring raid with midget subs."
James Caan
as Cmdr. Richard Bolton, RNVR
David Sumner
as Lt. Davies R.N.V.R
Norman Bowler
as Sub-Lt. Pennington, RN
Paul Young
as Leading Seaman Quentin
Brian Grellis
as CPO Barquist X 3
William Dysart
as Lt. Robert Talbot Gogan R.N.R.
John Kelland
as Sub-Lt. Keith Willis, RNVR
Kenneth Farrington
as CPO Boker Knowles
Carl Rigg
as CPO Norman Kennedy
Steve Kirby
as Leading Seaman X-2
Nick Tate
as Leading Seaman X-1
George Pravda
as Capt. Erlich of the 'Lindendorf'
Rupert Davies
as Vice Admiral Redmayne (uncredited)
Keith Alexander
as Sub. Lt. X-3
Diana Beevers
as WRNS Officer (uncredited)
Paul Hansard
as Cmdr. Steiner (uncredited)
Luke Hanson
as German Lieutenant (uncredited)
Desmond Jordan
as Naval Doctor (uncredited)
Dennis Mayers
as Sub-Lieutenant on X-1 (uncredited)
Doug Robinson
as Seaman in Self-defence Demonstration (uncredited)
George Roubicek
as Redmayne's Flag Officer (uncredited)
Richard Steele
as Captain in Redmayne's Office (uncredited)
William A. Graham
Director
Guy Elmes
Screenplay
John C. Champion
Story
Edmund H. North
Producer
Donald S. Sanford
Ron Goodwin
Original Music Composer
Paul Beeson
Director of Photography