![Sanctum](https://image.chilimovie.com/public/300px/20200507/zRUNv1CbeVtmTCNr6RLHnxV2QYm.jpg)
Master diver Frank McGuire has explored the South Pacific's Esa-ala Caves for months. But when his exit is cut off in a flash flood, Frank's team—including 17-year-old son Josh and financier Carl Hurley are forced to radically alter plans. With dwindling supplies, the crew must navigate an underwater labyrinth to make it out.