Scientists believe that monster sharks make their home under the Old Seven Mile Bridge. Fishermen claim that one of the sharks is a 18-foot long, one-ton great hammerhead named Big Moe. If this is true, he will be the largest hammerhead on the planet.

Adam Devine and a team of experts found a secret shark lair that may be the world's largest gathering of tiger sharks. To Adam and friends Anders Holm and Blake Anderson, it's the ultimate shark party, and they want to know what makes this party epic.

In Australia, scientists have made an astonishing discovery: there's not just one population of great whites, there's two. And one appears deadlier than the other. Experts pit the shark tribes against one another to discover what's really going on.