Trailer
Images
 | Jack Hawkins as Ericson |
 | Donald Sinden as Lockhart |
 | Denholm Elliott as Morell |
 | John Stratton as Ferraby |
 | Stanley Baker as Bennett |
 | Liam Redmond as Watts |
 | Meredith Edwards as Yeoman Wells |
 | Bruce Seton as Tallow |
 | John Warner as Baker |
 | Barry Letts as Raikes |
 | Gerard Heinz as Polish Captain |
 | Fred Griffiths as Gracey |
 | Glyn Houston as Phillips |
 | Virginia McKenna as Julie Hallam |
 | Megs Jenkins as Tallow's Sister |
 | June Thorburn as Doris Ferraby |
 | Moira Lister as Elaine Morell |
 | Alec McCowen as Tonbridge |
 | Leo Phillips as Wainwright |
| Dafydd Havard as Signalman Rose |
 | Laurence Hardy as Sellars |
 | Sam Kydd as Carslake |
 | John Singer as Gray |
| Barry Steele as Broughton |
| Gerik Schjelderup as Norwegian Captain |
| Gaston Richer as French Captain |
 | Andrew Cruickshank as Scott Brown |
| Kenn Kennedy as Allingham |
 | Harold Goodwin as ASDIC Operator |
 | George Curzon as Admiral at Party |
| Anthony Snell as R.N. Lieutenant |
| Ronald Simpson as R.N. Captain |
 | Don Sharp as Lieutenant-Commander |
| Herbert C. Walton as The Waiter |
| Jack Howard as A Survivor |
 | Russell Waters as A.R.P. Warden |
| Harold Jamieson as A.R.P. Warden |
| Warwick Ashton as Petty Officer Instructor |
 | Walter Fitzgerald as Warden (uncredited) |
 | Paddy Joyce as Sonar Operator (uncredited) |
 | Richard Leech as Sailor (uncredited) |
 | Jim Brady as Sailor in Water |
 | Alan Webb as Admiral Murray-Forbes (uncredited) |
| Directing | |
| Charles Frend | Director |
Writing | |
| Nicholas Monsarrat | Novel |
| Eric Ambler | Screenplay |
Production | |
| Leslie Norman | Producer |
Sound | |
| Alan Rawsthorne | Music |
Camera | |
| Gordon Dines | Director of Photography |
Editing | |
| Peter Tanner | Editor |
Art | |
| Jim Morahan | Art Direction |
Costume & Make-Up | |
| Sidney Turner | Makeup Artist |
| Barbara Barnard | Hairstylist |
Directing | |
| Norman Priggen | Assistant Director |
Crew | |
| Sydney Pearson | Special Effects |
Camera | |
| Chic Waterson | Camera Operator |
Production | |
| Hal Mason | Production Supervisor |
| L. C. Rudkin | Unit Production Manager |
Sound | |
| Stephen Dalby | Sound Supervisor |
| Leo Wilkins | Sound Recordist |
Directing | |
| Jean Graham | Continuity |
Costume & Make-Up | |
| Anthony Mendleson | Wardrobe Designer |
Visual Effects | |
| Geoffrey Dickinson | Visual Effects |
Camera | |
| John R.F. Stewart | Additional Photography |
Crew | |
| J. E. Broome | Technical Advisor |
| R. S. Abram | Technical Advisor |
| Jo Jago | Second Unit Cinematographer |
| Paul Beeson | Second Unit Cinematographer |
Sound | |
| Ernest Irving | Conductor |
