MASTER DIVER FRANK MCGUIRE LEADS A TEAM-INCLUDING HIS 17-YEAR-OLD SON-TO EXPLORE THE LARGEST, MOST BEAUTIFUL AND LEAST ACCESSIBLE CAVE SYSTEM ON EARTH. BUT WHEN A TROPICAL STORM CUTS OFF THEIR ONLY ESCAPE ROUTE, THE TEAM MUST WORK TOGETHER TO FIND THEIR WAY THROUGH AN UNCHARTED AND DANGEROUS LABYRINTH.
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