Cast
Austin Trevor
U-boat Captain
Cyril Chamberlain
Press
Frank Cellier
Schneider
John Stuart
Royal Navy: Naval Officer
George Merritt
German: German Shelter Marshal
Leslie Banks
Taylor
Thora Hird
German barmaid (uncredited)
Will Hay
Skipper
Michael Rennie
George
Alfred Drayton
Direktor
Morland Graham
Civil Service
Ronald Adam
German businessman (uncredited)
Michael Redgrave
Russian
John Mills
Tom
Marius Goring
German Propaganda Officer
John Boxer
Press
Bernard Miles
Royal Navy Mate
Ronald Shiner
Shipping clerk (uncredited)
Michael Wilding
Captain (uncredited)
Robert Morley
Von Geiselbrecht
Frederick Piper
Malta official (uncredited)
John Williams
Voice over (uncredited)
Albert Lieven
Gunter
George Woodbridge
Quisling
Manning Whiley
Naval officer (uncredited)