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National Geographic Documentaries: 2012

2012x42 Earth's Giant Hole
TV-PG

  • 2012-11-22T02:00:00Z on National Geographic
  • 45m
  • United States
  • English
  • Documentary
Professor Darryl Granger explores China's tiankengs - giant natural holes, hundreds of metres deep, which have developed in unusual environmental conditions.
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