Directed by
| William A. Graham | ... | (as William Graham) |
Writing Credits
| Donald S. Sanford | ... | (screenplay) (as Donald Sanford) and |
| Guy Elmes | ... | (screenplay) |
| John C. Champion | ... | (story) and |
| Edmund H. North | ... | (story) (as Edmund North) |
Cast (in credits order) complete, awaiting verification
| James Caan | ... | Commander Bolton | |
| David Sumner | ... | Lt. Davies R.N.V.R | |
| Norman Bowler | ... | Sub. Lt. Pennington | |
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Brian Grellis | ... | C.P.O. Barquist |
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Paul Young | ... | Leading Seaman Quentin |
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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 | |
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Steve Kirby | ... | Leading Seaman X-2 |
| Nick Tate | ... | Leading Seaman X-1 (as Nicholas Tate) | |
| George Pravda | ... | Captain Erlich | |
| Rest of cast listed alphabetically: | |||
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Diana Beevers | ... | WRNS Officer (uncredited) |
| Rupert Davies | ... | Vice-Adm. Redmayne (uncredited) | |
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Paul Hansard | ... | Cmdr. Steiner (uncredited) |
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Luke Hanson | ... | German Lieutenant (uncredited) |
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Desmond Jordan | ... | Naval Doctor (uncredited) |
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Dennis Mayers | ... | Sub-Lieutenant on X-1 (uncredited) |
| Doug Robinson | ... | Seaman in Self-defence Demonstration (uncredited) | |
| George Roubicek | ... | Redmayne's Flag Officer (uncredited) | |
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Richard Steele | ... | Captain in Redmayne's Office (uncredited) |
Produced by
| John C. Champion | ... | producer |
| Ted Lloyd | ... | associate producer |
| Irving Temaner | ... | executive producer |
Music by
| Ron Goodwin | ||
Cinematography by
| Paul Beeson | ... | director of photography |
Editing by
| John S. Smith | ||
Art Direction by
| William C. Andrews | ... | (as Bill Andrews) |
Makeup Department
| George Blackler | ... | makeup artist |
Production Management
| Tom Sachs | ... | production manager |
Second Unit Director or Assistant Director
| Anthony Waye | ... | assistant director |
| Mike Higgins | ... | third assistant director: additional photography (uncredited) |
Art Department
| Kenneth Ryan | ... | set dresser |
Sound Department
| Rydal Love | ... | sound editor |
| Cyril Swern | ... | sound recordist |
| Peter Elliott | ... | dialogue editor (uncredited) |
Special Effects by
| Nick Allder | ... | special effects (uncredited) |
| Les Bowie | ... | special effects (uncredited) |
| Terry Schubert | ... | special effects technician (uncredited) |
Stunts
| Jack Cooper | ... | stunts (uncredited) |
Camera and Electrical Department
| Lionel Banes | ... | additional photography |
| Neil Binney | ... | camera operator |
| Dennis Fraser | ... | grip (uncredited) |
| Mike Rutter | ... | focus puller (uncredited) |
Costume and Wardrobe Department
| John Briggs | ... | wardrobe |
Music Department
| Ron Goodwin | ... | conductor |
Script and Continuity Department
| Doreen Soan | ... | continuity |
Additional Crew
| Raymond Becket | ... | production assistant (uncredited) |