Lors d'un forage dans une caverne sous-marine, des scaphandriers sont attaqués par un megalodon. Ancêtre préhistorique du requin, il est le plus féroce prédateur des mers que n'ait jamais connu notre planète. Employée par le richissime collectionneur Feiersinger, l'océanographe Kim Melville découvre que des spécimens ont survécu dans des grottes sous-marines alors qu'ils sont censés avoir disparu depuis 5 millions d'années ! Une découverte...

The megalodon, the prehistoric ancestor of the great white shark was the most ferocious predator of the seas, an 80 foot killing machine extinct for millions of years… But when divers drilling in an underwater cave are attacked by this living fossil, oceanographer Kim Melville discovers that this creature may not only have survived, but thrived, and is reclaiming its place at the top of the food chain.

The megalodon, the prehistoric ancestor of the great white shark was the most ferocious predator of the seas, an 80 foot killing machine extinct for millions of years… But when divers drilling in an underwater cave are attacked by this living fossil, oceanographer Kim Melville discovers that this creature may not only have survived, but thrived, and is reclaiming its place at the top of the food chain.

The megalodon, the prehistoric ancestor of the great white shark was the most ferocious predator of the seas, an 80 foot killing machine extinct for millions of years... But when divers drilling in an underwater cave are attacked by this living fossil, oceanographer Kim Melville discovers that this creature may not only have survived, but thrived, and is reclaiming its place at the top of the food chain.