In this thrilling WWII adventure, a new commanding officer is sent to tighten the discipline of a group of Navy underwater demolition experts, a.k.a. frogmen. Replacing a popular officer whom the men idolized, the new commander at first wins few friends with his strict style. He finally proves himself by risking his own life to disarm a live torpedo, and then helps the men prepare for a critical, but dangerous mission - sabotaging a Japanese submarine base.