Lechuguilla Cave is, as of August 2007, the fifth longest cave (126.1 miles (203 km)) known to exist in the world, and the deepest in the continental United States (1,604 feet (489 m)), but it is most famous for its unusual geology, rare formations, and pristine condition.The cave is named for Agave lechuguilla, a plant found near its entrance. It is located in Carlsbad Caverns National Park, New Mexico. Access to the cave is limited to approved scientific researchers, survey and exploration teams, and National Park Service management-related trips.
Since 1986, explorers have mapped over 126 miles (203 km) of passages and have pushed the depth of the cave to 1,604 feet (489 m), ranking Lechuguilla as the 5th longest cave in the world (4th longest in the United States) and the deepest limestone cave in the country. Cavers, drawn by the caves' pristine condition and rare beauty, come from around the world to explore and map its passages and geology. Lechuguilla Cave offered even more than just its extreme size. Cavers were greeted by large amounts of gypsum and lemon-yellow sulfur deposits. A large variety of rare speleothems, some of which had never been seen anywhere in the world. The Denver Museum of Natural History (now known as the Denver Museum of Nature and Science) filmed one of the first documetaries in the cave entitled "Lechuguilla Cave".
