Scientists in South America are studying the shark species thought to be responsible for a spike in deadly attacks since 1990. Marine biologist Danni Washington and shark conservationist Paul de Gelder join a team tracking tiger sharks off a pristine tropical archipelago in Brazil.

News of a harrowing shark encounter at North Carolina's Frying Pan Tower sends underwater cinematographer Andy Casagrande and shark expert Kori Burkhardt on a dangerous quest to discover whether great white sharks are moving into the state's waters.

A 14-foot giant mako shark is spotted in the waters of Portugal's Azores region. Underwater cinematographer Joe Romeiro and his marine biologist wife, Lauren, search the teeming depths around the ancient islands to capture the beast on film.