Return to Headstone Hell

Dr. Riley Elliott returns to Australia's Norfolk Island with underwater cinematographer Kina Scollay to see what happens when the island's tiger sharks go head-to-head with migrating great whites over an unusual food source: cow carcasses.

Big Shark Energy

Shark experts Dr. Riley Elliot and Kori Burkhardt conduct a one-of-a-kind shark competition to determine which male great white is the alpha in the pack. To see who has the most swagger, they test the sharks' speed, hunting ability and fearlessness.