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!

• Euro International Films
• BHP
• John Mills
• Ettore Manni
• Roberto Risso
• Robert Shaw
• Liam Redmond
• Dinsdale Landen
• John Meillon
• Patrick Barr