Researchers investigate whether orcas have begun hunting great white sharks off the coast of New Zealand.
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.
Shark expert Kina Scollay and his elite team return with a unique one-person submersible, the Mechashark, to a top secret location off New Zealand attempting to do something that's never been done: locate a great white shark mating ground.
