Leslie Banks

Taylor

Michael Redgrave

Russian

Will Hay

Skipper

John Mills

Tom

Bernard Miles

Royal Navy Mate

Michael Rennie

George

Frank Cellier

Schneider

Robert Morley

Von Geiselbrecht

Alfred Drayton

Direktor

Marius Goring

German Propaganda Officer

Austin Trevor

U-boat Captain

Albert Lieven

Gunter

Leif Konow

Dane

John Stuart

Royal Navy: Naval Officer

Morland Graham

Civil Service

John Boxer

Press

Cyril Chamberlain

Press

Elliott Mason

German: German Stationmistress

George Merritt

German: German Shelter Marshal

Bernard Rebel

Quisling

George Woodbridge

Quisling

Ronald Adam

German businessman (uncredited)

Mark Daly

Driver (uncredited)

Thora Hird

German barmaid (uncredited)

Frederick Piper

Malta official (uncredited)

Ronald Shiner

Shipping clerk (uncredited)

Manning Whiley

Naval officer (uncredited)

Michael Wilding

Captain (uncredited)

John Williams

Voice over (uncredited)