While locals have known about the sinkholes for centuries, it was only "discovered" by the outside world in 1994, when British explorers attempted to survey its maze-like underground cave system. Despite attempting to map the underground river five times in a 10-year period, speleologists found the gushing torrent too difficult to navigate and the team never succeeded. As a result, this deep, dark underworld remains one of China's great geological mysteries.
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