- James Caan
- Commander Bolton
- David Sumner
- Lt. Davies R.N.V.R
- Norman Bowler
- Sub. Lt. Pennington
- Brian Grellis
- C.P.O. Barquist
- Paul Young
- Leading Seaman Quentin
- William Dysart
- Lt. Gogan R.N.R.
- John Kelland
- Sub. Lt. Willis R.N.V.R.
- Kenneth Farrington
- C.P.O. Boker Knowles
- Keith Alexander
- Sub. Lt. X-3
- Carl Rigg
- C.P.O. Kennedy
- Steve Kirby
- Leading Seaman X-2
- Nick Tate
- Leading Seaman X-1
- George Pravda
- Captain Erlich
- Diana Beevers
- WRNS Officer
- Rupert Davies
- Vice-Adm. Redmayne
- Paul Hansard
- Cmdr. Steiner
- Luke Hanson
- German Lieutenant
- Desmond Jordan
- Naval Doctor
- Dennis Mayers
- Sub-Lieutenant on X-1
- Doug Robinson
- Seaman in Self-defence Demonstration
- George Roubicek
- Redmayne's Flag Officer
- Richard Steele
- Captain in Redmayne's Office
