National Geographic Documentaries
National Geographic Documentaries
Mysteries Underground (27x1)
Udgivelsesdato: Nov 18, 1992
Chronicles the exploration of the world's most exotic new cave: New Mexico's Lechuguilla Cave, which remained undisturbed for millions of years until 1986. Also see the 1972 expedition that stumbled upon a passageway that linked the Mammoth and Flint Ridge Cave systems, creating the longest cave network in the world.
- Premieret: Sep 1965
- Afsnit: 862
- Følgere: 39