Disaster strikes more than six miles below the ocean surface when water crashes through the walls of a drilling station. Led by their captain, the survivors realize that their only hope is to walk across the sea floor to reach the main part of the facility. But they soon find themselves in a fight for their lives when they come under attack from mysterious and deadly creatures that no one has ever seen.

Legacy designed the specialty suits for the actors, which included some that allowed the actors to actually scuba-dive underwater.