Sanctum plot
"The only way out is down."
A team of divers is on an expedition to the largest, most beautiful and least accessible caves on Earth. A tropical storm forces them to go deeper into the caves. Experienced diver Frank McGuire has spent months exploring the Esa-ala Caves in the South Pacific. But when his unknown escape route is blocked by a tidal wave, Frank's team, including his 17-year-old son Josh and financier Carl Hurley, are forced to radically change their plan. With dwindling supplies, they must navigate an underwater maze to find a way out.