Lechuguilla cavern is a man-eating cave discovered in New Mexico's carlsbad caverns national park in the mid-1980s. Estimated to extend for more than three hundred miles, only ninety of them mapped, the cave was formed b...Lechuguilla cavern is a man-eating cave discovered in New Mexico's carlsbad caverns national park in the mid-1980s. Estimated to extend for more than three hundred miles, only ninety of them mapped, the cave was formed by acid burning away the limestone; corridors, pits, cramped wormholes, cliffs, and splendid rooms the size of football fields tangle together in a maze shrouded in the utter darkness of the underground.