"The Sea Hornet" was a merchant ship sunk, supposedly by a torpedo, less than a mile off the California Coast during World War Two. Six years later when his buddy is killed, attempting to blow up the sunken ship, on the orders of Suntan Radford and Tony Sullivan, deep-sea diver "Gunner" McNeil has his suspicions aroused... especially since Suntan is the daughter of the ship's captain that died when the ship sunk, and Sullivan was a crew member. Plus the fact the ship had over a million dollars in cash on board. During the course of his investigation, he becomes romantically involved with Ginger Sullivan

Der verwegene Tiefseetaucher Gunner soll vor der kalifornischen Küste nach einem im zweiten Weltkrieg versenkten Schiff tauchen. Die Auftraggeber vermuten über eine Millionen Dollar im Schiffsrumpf. Im Verlauf des gewagten Manövers gerät der Taucher in eine Raubmordaffäre und muss um sein eigenes Leben kämpfen...

Un submarinista empieza a sospechar que un barco hundido desde la Segunda Guerra Mundial contiene algo más que metal oxidado, sobre todo desde que un colega muere cuando intentaba volarlo.