Legendary boxer Mike Tyson is BACK, taking on a new challenge and he's chosen the most unlikely training partner -- sharks. Tyson will face his fears and square up with the ocean's champions to learn how to TKO a shark all in the name of research.

While a global lockdown quiets the ocean and lures New Zealand's biggest great whites out of hiding, expert Kina Scollay climbs inside a mobile dive cage, the "Snackbox," on a quest to find monster shark 747 and solve an even bigger mystery.

Lack of human activity on the water caused by the global lockdown has led the largest great whites in South Australia to return to their natural behaviors. Shark experts can now study them up close and personal in ways that were nearly impossible before.