Haie an Bord plot
Dive instructor Fred Norman, who works in a jet-set resort on the Costa Smeralda, is approached one day by Andrea Jacobs. She is the lover of the mobster Harry Lang. Both have sunk the loot from a robbery on a money transport, years earlier, in the sea, to secure it for their fellow gangsters. Jacobs and Lang force Norman to help them dig up the gold. The excitement on board the fishing cutter, with which one goes in search, is to die for. Especially when the operation turns out to be much more difficult than expected. In addition, an ex-partner of the gangsters, Paul Barko, also appears to be after the loot.