Man vs. Wild host Michael Grylls survived some of nature's harshest conditions, but how will he fare when plunged into the depths of the ocean to survive among the sharks? Discover channel will put the adventurer's survival skills to the test when he takes a dive with the ocean's number one predator.

Ex-Marine and Navy vet Rob Riggle sets out to help Basketball legend Shaquille O'Neal overcome his fear of sharks before he takes his first deep dive.

The UFC Hall of Famer claimed victories over plenty of fighters, but she'll face off with perhaps her biggest opponent yet when she goes swimming—uncaged—with Mako sharks. Luckily she'll have expert Navy diver and shark attack survivor Paul De Gelder on hand to coach her through the match.