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.

Researchers investigate whether orcas have begun hunting great white sharks off the coast of New Zealand.

Scientists set out to learn how great whites defeated a super-predator.