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A group of underwater cave enthusiasts and mountaineering organizations explore the Leye pre-history Karst in the Guangxi Zhang Autonomous Region. Never-before filmed, these underwater caves are home to species not yet discovered. (National Geographic)
Gallery (4)
Photo © National Geographic Channel
![The Search for China's Blue Hole - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/161/903/161903834_eda41c.jpg)
Photo © National Geographic Channel
![The Search for China's Blue Hole - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/161/903/161903835_bb0e24.jpg)
Photo © National Geographic Channel
![The Search for China's Blue Hole - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/161/903/161903836_2c7d23.jpg)
Photo © National Geographic Channel
![The Search for China's Blue Hole - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/161/903/161903837_ccbdbe.jpg)