Clive Brook

Character: Captain Tom Armitage

John Clements

Character: Lieutenant Cranford

Edward Chapman

Character: Captain Eckersley

Judy Campbell

Character: Lucy Armitage

Penelope Dudley-Ward

Character: Mabel

Edward Rigby

Character: Mr. Matthews

Allan Jeayes

Character: Commander Blount

Michael Wilding

Character: Dot

Harold Warrender

Character: Lt. Commander Martin

David Hutcheson

Character: Captain Sandeman

George Carney

Character: Bates

Al Millen

Character: Knowles

Charles Farrell

Character: Walker

John Laurie

Character: Gates

George Benson

Character: Parker

Hay Petrie

Character: Minesweeper Skipper

Mervyn Johns

Character: His Mate

Albert Lieven

Character: Commander U.37

John Wengraf

Character: Commander Deutschland

Edward Lexy

Character: Merchantman Skipper

John Glyn-Jones

Character: Mate

John Boxer

Character: German Captain

John Carol

Character: Edmonds

Alec Clunes

Character: Bit Part

Anton Diffring

Character: U-Boat Officer

Derek Elphinstone

Character: Hawkins

Alf Goddard

Character: Bosun's Mate

Stewart Granger

Character: Sutton

Bryan Herbert

Character: Signals Yeoman

Patrick Holt

Character: Holt

James Knight

Character: Admiral

Maire O'Neill

Character: Mary Hogan

Charles Rolfe

Character: Peacock - Wardroom Steward

Harry Terry

Character: Sailor

Charles Williams

Character: 'Shorty' Howard

Howard Lang

Character: Gunnery Officer (uncredited)