A Peruvian fisherman disappears on the high seas. Hordes of poisonous jellyfish are besieging the shores of Australia. In Canada, peaceful whales have turned into aggressors. Millions of worms with powerful jaws have appeared at the bottom of the Norwegian Sea - and they are interfering with oil production. Various scientists suggest that behind these anomalies lies something more - something is setting the inhabitants of the seas against humans. The continued existence of the human race is in question. But who or what is unleashing the disaster emanating from the ocean? In search of the culprit, scientists and military personnel are faced with the worst of their nightmares and realize: we know even less about the underwater world of our planet than about space...