Hal and Roger Hunt are scuba diving in the South Seas as part of an underwater operation collecting rare species for the Oceanographic institute. They are exposed to incredible sights in the beautiful coral reefs of the South Pacific and go in search of hidden treasure in the sunken remains of an old Spanish naval ship. Sharks hungry for blood join them on several occasions in the water, but far more threatening is the presence of a crooked old school friend of Hal’s with his sights set on stealing the treasure for himself.
