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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.

Trapped in a claustrophobic underwater labyrinth, a team of divers must outrun a rising flash flood before their oxygen runs out. Survival depends on navigating pitch-black cave systems where every wrong turn leads to a watery grave.

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