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!
as Captain Morgan
as Luigi Durand de la Penne
as Emilio Bianchi
as Lieutenant Field
as Surgeon Commander Reilly
as Norris
as Bedford
as Rev. Ellis
as Capt. Turnbull
as Payne
as Admiral
as Italian Commander
