World-class Red Bull high diver Molly Carlson leaps from a helicopter hovering above the open ocean in a bid to complete the highest freefall dive in Shark Week history, targeting a narrow plexiglass cage surrounded by circling reef sharks, or risking a direct plunge into a chum-filled feeding frenzy where seconds mean survival. From concept to execution, this fearless athlete will push herself to the limit with a record-setting stunt that no high diver has ever attempted.

After a wave of mauled marine life washes ashore in New York, conservation biologist Dr. Craig O'Connell launches an investigation to find the culprit. When it leads to an old nuclear dumping ground teaming with great whites and makos, he is left with the chilling theory that the predator may be radioactive. A deeper dive reveals an unexpected hotspot for massive makos off the coast of the Hamptons, suggesting that these waters may be hiding something even bigger beneath the surface.