In the Caribbean, a deepsea camera captured footage of a 14-foot tiger shark suffering an assault by a large, unseen beast. It could be an unknown species of mega-shark or even a cannibalistic tiger shark. Dr. Austin Gallagher wants to find out.

On the edge of the Bermuda Triangle lies Ghost Island, a place locals have abandoned after multiple shipwrecks and shark attacks. Dr. Craig O'Connell has been here before to study the potential shark hot spot, but his first trip ended abruptly when his boat nearly sank. Now Craig is back with a team of experts and they are determined to find why this island attracts so many sharks, even the great white.