Mysteries UndergroundDVD - 2009
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.
Publisher: Washington, DC : National Geographic Video, c2009
Characteristics: 1 videodisc (50 min.) : sd., col. ; 4 3/4 in