National Geographic Documentaries Season 2012 Episode 31

National Geographic Documentaries Season 2012 Episode 31 Earth's Giant Hole

  • November 21, 2012

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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Description
  • First Aired
    November 21, 2012
  • Language
    English
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