A mapping expedition in which an explorer broke a leg deep below the Earth's surface discovered 2.6 more miles to Lechuguilla Cave, making it the eighth-longest in the world. At 56.9 miles, the cave jumped four notches from 12th in the world, Carlsbad National Park management assistant Bob Crisman said. The cave is the deepest in the United States at 1,565 feet and fourth-longest in the country. During the expedition Emily Mobley of Schoharie, N.Y., broke a leg and had to be rescued. After the rescue, the expedition resumed April 4, discovering 2.6 more miles of rooms and passages.
