What is the deepest cave in the United States?
Lechuguilla Cave is, in 2006, the sixth longest cave (116 mi, or 187 km) known to exist in the world, and the deepest in the continental United States (489 m, or 1604 ft), but it is most famous for its unusual geology, unparalleled formations, and pristine condition. It is located in the 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.
