A deep sea fracking operation in the Arctic Ocean breaks through into a world hidden for 15-million years, an undersea cavern from the Pliocene Epoch of the Cenozoic Era. Among the prehistoric terrors unleashed is a giant megalodon, a shark so efficient it had no need to change for 20-million years. Asa Iverson was the only survivor from the Global Kulik incident. Now, the nightmares haunt him. Did he see a colossal shark long thought extinct, or was it a hypothermia-induced hallucination? Now, he's back in the Arctic to see for himself, and the deadliest predator the world has ever known is headed in his direction.