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Deep in the forests of the South Pacificnlay a deadly maze known as the Mother of Caves, Isla Ala.nIts entrance was a 300-meter vertical cliff,nand within it snaked over 20 kilometers of dark waterways that swallowed everything.nAn expedition team ventured deep inside,nsearching for the legendary passage that led to the open sea.nThe cave's interior was complex,nand the passageways were pitch black.nThe team had been working for 34 straight days,npushing deeper and hauling equipment.nFrank, an expert cave diver,nwas already a thousand meters below,nand ahead of him lay completely uncharted territory.nCarl urged Frank on through video link,nsaying that since 80 percent of the dive had gone safely,nthe remaining 20 percent was just a matter of time.nFrank knew Carl was being naive.nThe divers had been working in the dark for too long,nand both mental strain and physical exhaustion were taking a heavy toll.nFrom the very first day they entered the cave,neveryone had accepted that death was a real possibility.nFrank and his teammate Judy went underwater again,nwhile George operated a mini-sub to maintain communication.nThe initial route was fairly wide,nand they reached the transfer station quickly,nwhere they picked up spare oxygen tanks and a thruster.nAhead lay a massive underwater passage along a sheer cliff wall,nits deep silence suffocating.nMeanwhile, Carl arrived at the cave's edge with his girlfriend Victoria and Frank's son Josh.nAfter checking their gear, Victoria jumped first,nnot knowing they were leaping straight into the devil's gaping maw.nJosh followed close behind,nand both were suspended in midair, awestruck by the natural wonder.nThen Carl jumped without even tying a rope,nand the massive opening was so deep that he fell for a long time before hitting the ground.