The megalodon shark. A prehistoric killing machine 60 feet long, flashing 200 pounds of teeth and weighing over 20 tons. It's the deadliest predator the world has ever seen. The scientists say it's been extinct for more than 10,000 years. The scientists are wrong. In the darkness of the deep, an underwater research station has been viciously destroyed. Now a tough team of daring divers led by Spencer Northcutt is taking an experimental sub to war. It's killer instinct vs. sophisticated technology, deadly jaws vs. harpoon tipped torpedoes, mega-shark vs. modern man in this thrilling extreme deep sea fight to the death.