Inside the Amazing Lechuguilla Cave

Only scientists are allowed inside the delicate Lechuguilla Cave in New Mexico's Carlsbad Caverns—so this amazing segment from the Planet Earth documentary is your only chance to get a glimpse inside this astonishing natural wonder.

Liked this? You'll love these, too:

• 

  An Antarctic Time Machine

  In this TED Talk, science writer Lee Hotz explains a fascinating project in Antarctica. Watch Now

• 

  Joshua Klein on the Intelligence of Crows

  In this TED Talk, writer Joshua Klein describes the vending machines he built to test crows' intelligence. Watch Now

• 

  Asteroid Discovery From 1980 - 2010

  An amazing view of the solar system over the past 30 years, showing all the asteroids that have been discovered. Watch Now

• 

  The Bubble Room

  Follow a diver down to a special "bubble room" at the bottom of the ocean. Watch Now

• 

  The Lynx Nudibranch

  A fascinating look at the microscopic creatures that live on top of an oyster's shell. Watch Now