PBS
Pbs Nova: The Mysterious Life of Caves
Companion to a PBS program in the Nova series. There are wonderful photos of the Lechuguilla cave system in New Mexico, and some new information on how caves are formed.
PBS
Nova: Jewel of the Underground
Take a virtual tour of Lechuguilla, a cave discovered in 1986, which turns out to be one of the biggest in the Americas. Twelve different pictures of interesting formations reveal the reason the park service has decided to keep it off...