| Person | Type | Job | Role(s) |
|---|---|---|---|
 Arthur Benjamin | Crew | Sound | Original Music Composer |
 Earl St. John | Crew | Production | Executive Producer |
George Provis | Crew | Art | Art Direction |
 Gerald Thomas | Crew | Editing | Editor |
 Ralph Thomas | Crew | Directing | Director |
Robin Estridge | Crew | Writing | Screenplay |
William MacQuitty | Crew | Production | Producer |
Ernest Steward | Crew | Camera | Director of Photography |
 Anthony Newley | Cast | Actor | Engineer, X2 |
Arthur Howell | Cast | Actor | German Navy Officer (uncredited) |
Barry Keegan | Cast | Actor | Sailor on Towing Sub (uncredited) |
Basil Appleby | Cast | Officer on Towing Sub. (2) | |
 Cyril Chamberlain | Cast | Actor | CPO Chubb |
 Donald Sinden | Cast | Actor | Lieutenant Tom Corbett |
 Frank Lawton | Cast | Actor | Naval Officer in Briefing Room (uncredited) |
Guido Lorraine | Cast | Actor | Officer Interpreter |
 Harry Towb | Cast | Actor | McCleery |
 James Kenney | Cast | Actor | Abercrombie |
 James Robertson Justice | Cast | Actor | Admiral Ryder |
 John Gregson | Cast | Actor | Lieutenant Alec Duffy |
 John Horsley | Cast | Actor | Lt. Anderson |
 John Mills | Cast | Actor | Commandant Fraser |
 Lee Patterson | Cast | Actor | Cox |
Leslie Weston | Cast | Actor | Winley |
 Lyndon Brook | Cast | Actor | Diver Navigator, X2 |
 Michael Medwin | Cast | Actor | Smart |
 O.E. Hasse | Cast | Actor | Captain of the Tirpitz |
 Raymond Francis | Cast | Actor | Officer on Towing Sub. (1) |
 Theodore Bikel | Cast | Actor | German Officer |
 Thomas Heathcote | Cast | Actor | Hutchins |
 Walter Gotell | Cast | Actor | German Officer on Tirpitz |
 William Franklyn | Cast | Actor | No. 1, X2 |
 William Russell | Cast | Actor | Ramsey |
 Tony Wager | Cast | Actor | George |
 Victor Harrington | Cast | Actor | RAF Officer (uncredited) |
| Person | Type | Job | Role(s) |
