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.

Aaron Rodgers, Lindsey Vonn and Rob Gronkowski team up with scientists to learn about wildlife tags, which help researchers figure out where sharks feed, mate and birth their pups - crucial information that will help conserve the species.

Dr. Mauricio Hoyos and shark experts Partington and Brandon McMillan take a journey to the sea floor off Guadalupe Island to find the famed 20-foot-long great white shark, Deep Blue. Their trip marks the first manned expedition to the deepest parts of Guadalupe's sea in search of the notorious shark.