Full Credits
22 members

James Caan
Cmdr. Richard Bolton, RNVR

David Sumner
Lt. Davies R.N.V.R

Norman Bowler
Sub-Lt. Pennington, RN

Paul Young
Leading Seaman Quentin

Brian Grellis
CPO Barquist X 3

William Dysart
Lt. Robert Talbot Gogan R.N.R.

John Kelland
Sub-Lt. Keith Willis, RNVR

Kenneth Farrington
CPO Boker Knowles

Carl Rigg
CPO Norman Kennedy
Steve Kirby
Leading Seaman X-2

Nick Tate
Leading Seaman X-1

George Pravda
Capt. Erlich of the 'Lindendorf'

Rupert Davies
Vice Admiral Redmayne (uncredited)
Keith Alexander
Sub. Lt. X-3
Diana Beevers
WRNS Officer (uncredited)

Paul Hansard
Cmdr. Steiner (uncredited)
Luke Hanson
German Lieutenant (uncredited)
Desmond Jordan
Naval Doctor (uncredited)
Dennis Mayers
Sub-Lieutenant on X-1 (uncredited)
Doug Robinson
Seaman in Self-defence Demonstration (uncredited)

George Roubicek
Redmayne's Flag Officer (uncredited)
Richard Steele
Captain in Redmayne's Office (uncredited)
8 members
William A. Graham
Director
John C. Champion
Story
Edmund H. North
Story
Donald S. Sanford
Screenplay
Guy Elmes
Screenplay
John C. Champion
Producer
Paul Beeson
Director of Photography
Ron Goodwin
Original Music Composer