An engineer has discovered a new special alloy for the construction of submarines and is about to launch it on the world market. To force him to give up the formula, his opponents kidnap his son.

• Frederick Stafford
• Dagmar Lassander
• Enzo Maiorca
• Alberto Farnese
• Stelio Candelli
• Chris Avram
• Massimo Corsetti
• Mariana Camara