All movies starring Jack Scalia

After the sinking of the submarine "Siren-1", another submarine called "Siren-2" is sent in search of it. The designer of the first submarine, Vic Hayes, is persuaded to go on the expedition. The crew members have great difficulty in diving into an underwater crevasse, slightly scratching the hull, and are soon confronted with the fact that life exists at great depths, and it is not unfriendly at all.

Following a series of dives, carnivorous algae are discovered, and a little later, a mass of malignant and flesh-hungry organisms that were the result of genetic experiments on the animals on Siren 1...