Cage Dive (2017) on Netflix

Plot summary

Jeff, his brother Josh and Jeff's girlfriend Megan, from Laguna Beach, California, want a place on a reality game show that pays $100,000, and the application calls for proof of physical and mental strength. Jeff buys an underwater camera to record their attempt at a shark cage dive. Days before the dive the three fly to Sydney and stay with Josh and Jeff's cousin Greg, who throws them a good luck party. In Adelaide they reach the hotel, swim, and sleep before the tour. At the docks the next morning the crew gives safety instructions and chums the water so tourists can take turns in the steel cage. Josh, Jeff and Megan go in, and a rogue wave capsizes the boat.