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National Geographic Documentaries: 2015

2015x57 The Search For China's Blue Hole
TV-PG

  • 2015-09-25T01:00:00Z on National Geographic
  • 45m
  • United States
  • English
  • Documentary
A group of underwater cave enthusiasts and mountaineering organizations explore the Leye pre-history Karst in the Guangxi Zhang Autonomous Region.
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