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Clive Brook as Captain Tom Armitage |
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John Clements as Lieutenant Cranford |
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Edward Chapman as Captain Eckersley |
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Judy Campbell as Lucy Armitage |
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Penelope Dudley-Ward as Mabel |
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Edward Rigby as Mr. Matthews |
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Allan Jeayes as Commander Blount |
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Michael Wilding as Dot |
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Harold Warrender as Lt. Commander Martin |
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David Hutcheson as Captain Sandeman |
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George Carney as Bates |
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Al Millen as Knowles |
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Charles Farrell as Walker |
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John Laurie as Gates |
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George Benson as Parker |
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Hay Petrie as Minesweeper Skipper |
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Mervyn Johns as His Mate |
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Albert Lieven as Commander U.37 |
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John Wengraf as Commander Deutschland |
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Edward Lexy as Merchantman Skipper |
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John Glyn-Jones as Mate |
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John Boxer as German Captain |
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John Carol as Edmonds |
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Alec Clunes as Bit Part |
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Anton Diffring as U-Boat Officer |
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Derek Elphinstone as Hawkins |
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Alf Goddard as Bosun's Mate |
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Stewart Granger as Sutton |
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Bryan Herbert as Signals Yeoman |
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Patrick Holt as Holt |
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James Knight as Admiral |
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Maire O'Neill as Mary Hogan |
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Charles Rolfe as Peacock - Wardroom Steward |
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Harry Terry as Sailor |
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Charles Williams as 'Shorty' Howard |
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Howard Lang as Gunnery Officer (uncredited) |
| Directing | Pen Tennyson | Director |
| Writing | Pen Tennyson | Screenplay |
| Writing | Patrick Kirwan | Screenplay |
| Production | Michael Balcon | Producer |
| Sound | Ernest Irving | Music |
| Crew | Roy Kellino | Cinematography |
| Crew | Günther Krampf | Cinematography |
| Editing | Ray Pitt | Editor |
| Art | Wilfred Shingleton | Art Direction |
