Clive Brook
Captain Tom Armitage
Acting
John Clements
Lieutenant Cranford
Acting
Edward Chapman
Captain Eckersley
Acting
Judy Campbell
Lucy Armitage
Acting
Penelope Dudley-Ward
Mabel
Acting
Edward Rigby
Mr. Matthews
Acting
Allan Jeayes
Commander Blount
Acting
Michael Wilding
Dot
Acting
Harold Warrender
Lt. Commander Martin
Acting
David Hutcheson
Captain Sandeman
Acting
George Carney
Bates
Acting
Al Millen
Knowles
Acting
Charles Farrell
Walker
Acting
John Laurie
Gates
Acting
George Benson
Parker
Acting
Hay Petrie
Minesweeper Skipper
Acting
Mervyn Johns
His Mate
Acting
Albert Lieven
Commander U.37
Acting
John Wengraf
Commander Deutschland
Acting
Edward Lexy
Merchantman Skipper
Acting
John Glyn-Jones
Mate
Acting
John Boxer
German Captain
Acting
John Carol
Edmonds
Acting
Alec Clunes
Bit Part
Acting
Anton Diffring
U-Boat Officer
Acting
Derek Elphinstone
Hawkins
Acting
Alf Goddard
Bosun's Mate
Acting
Stewart Granger
Sutton
Acting
Bryan Herbert
Signals Yeoman
Acting
Patrick Holt
Holt
Acting
James Knight
Admiral
Acting
Maire O'Neill
Mary Hogan
Acting
Charles Rolfe
Peacock - Wardroom Steward
Acting
Harry Terry
Sailor
Acting
Charles Williams
'Shorty' Howard
Acting
Howard Lang
Gunnery Officer (uncredited)
Acting