National Geographic Documentaries
National Geographic Documentaries
Earth's Giant Hole (2012x31)
Exibido em:: Nov 21, 2012
Professor Darryl Granger explores China's tiankengs - giant natural holes, hundreds of metres deep, which have developed in unusual environmental conditions.
- Estreou: Set 1965
- Episódios: 859
- Seguidores: 39
- Em exibição
- CBS
- Desconhecido