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Clive Brook
Captain Tom Armitage

John Clements
Lieutenant Cranford

Edward Chapman
Captain Eckersley

Judy Campbell
Lucy Armitage

Penelope Dudley-Ward
Mabel

Edward Rigby
Mr. Matthews

Allan Jeayes
Commander Blount

Michael Wilding
Dot

Harold Warrender
Lt. Commander Martin

David Hutcheson
Captain Sandeman

George Carney
Bates

Al Millen
Knowles

Charles Farrell
Walker

John Laurie
Gates

George Benson
Parker

Hay Petrie
Minesweeper Skipper