Horror fell upon humanity from the depths of the ocean. Terrible biotechnological weapons, intelligent organic torpedoes and mines, developed in military laboratories, refused to obey their creators. Now the World Ocean is a territory forbidden to humans. When Andrei Vershinsky was a teenager, sea creatures deprived him of his closest people. Having matured, Vershinsky becomes a professional adventurer, but the thought of revenge does not leave him. Having lifted a load of gold from a barge flooded with biotech, he uses these funds to gather a team of sea-obsessed fighters and soon opens the deadly season of the Great Hunt for intelligent weapons that have taken over the ocean.