All the Sharks

The teams grab their cameras and diving gear and hit the turquoise waters of the Maldives, where rare silvertips lurk and ferocious tiger sharks circle.

Brutal currents and jellyfish stings make Japan the most challenging dive yet — but the prospect of seeing a sharknado keeps the groups spirits afloat.

With a game-changing bonus in play, the teams head to Bimini. Amid lemon sharks and an epic hammerhead sighting, one expert bravely faces their fears.