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

Sharktopia - Shar Week

Dr. Riley Elliott returns to Australia's Norfolk Island with underwater cinematographer Kina Scollay to see what happens when the island's tiger...

In New Zealand, shark experts simulate epic battles between great whites and 60-foot leviathan, studying orca tactics to find the ultimate predator.

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...