Having placed mines on the hull of a British warship whilst it is safe in harbour during the second World War , the two man crew of an Italian miniature submarine are captured and held prisoner whist the crew try and discover the nature of their mission!
Captain Morgan
Luigi Durand de la Penne
Emilio Bianchi
Lieutenant Field
Surgeon Commander Reilly
Norris
Bedford
Rev. Ellis
Capt. Turnbull
Payne
Admiral
Italian Commander