cast
- Clive Brook
- Capt. Armitage
- John Clements
- Lieut. David Cranford
- Edward Chapman
- Capt. Eckersley
- Judy Campbell
- Lucy Armitage
- Penelope Dudley-Ward
- Mabel
- Edward Rigby
- Mr. Mathews
- Charles Williams
- Shorty Howard
- Allan Jeayes
- Cmdr. Blount
- David Hutcheson
- Capt. Sandeman
- George Carney
- Bates
- Al Millen
- Knowles
- Charles Farrell
- Walker
- John Laurie
- Gates
- George Benson
- Parker
- Hay Petrie
- Minesweeper Skipper
- Albert Lieven
- Commander of U-37
- Edward Lexy
- Skipper
- Harold Warrender
- Lt. Cmdr. Martin
- Stewart Granger
- Sutton
- John Wengraf
- Cmdr. Deutschland
- Mervyn Jones
- Mates
crew
- Pen Tennyson
- Director, Screenwriter
- Michael Balcon
- Producer
- Patrick Kirwan
- Screenwriter
- Gunther Krampf
- Cinematographer
- Roy Kellino
- Cinematographer
