詹姆斯·凯恩
饰 Cmdr. Richard Bolton, RNVR
David Sumner
饰 Lt. Davies R.N.V.R
Norman Bowler
饰 Sub-Lt. Pennington, RN
Paul Young
饰 Leading Seaman Quentin
Brian Grellis
饰 CPO Barquist X 3
William Dysart
饰 Lt. Robert Talbot Gogan R.N.R.
John Kelland
饰 Sub-Lt. Keith Willis, RNVR
Kenneth Farrington
饰 CPO Boker Knowles
Carl Rigg
饰 CPO Norman Kennedy
Steve Kirby
饰 Leading Seaman X-2
Nick Tate
饰 Leading Seaman X-1
George Pravda
饰 Capt. Erlich of the 'Lindendorf'
Rupert Davies
饰 Vice Admiral Redmayne (uncredited)
Keith Alexander
饰 Sub. Lt. X-3
Diana Beevers
饰 WRNS Officer (uncredited)
Paul Hansard
饰 Cmdr. Steiner (uncredited)
Luke Hanson
饰 German Lieutenant (uncredited)
Desmond Jordan
饰 Naval Doctor (uncredited)
Dennis Mayers
饰 Sub-Lieutenant on X-1 (uncredited)
Doug Robinson
饰 Seaman in Self-defence Demonstration (uncredited)
