National Geographic Documentaries
National Geographic Documentaries
The Search For China's Blue Hole (2015x57)
Seizoensfinale
Uitzenddatum: Sep 24, 2015
A group of underwater cave enthusiasts and mountaineering organizations explore the Leye pre-history Karst in the Guangxi Zhang Autonomous Region.
- in première gegaan: Sep 1965
- Afleveringen: 862
- Volgers: 39
