before the bats migrate south for the winter. Lechuguilla Cave at Carlsbad Caverns is the deepest limestone cave in the country, and the fifth-longest known cave in the world. Read more about Oil and ...

Two decades later, I organized a series of expeditions to investigate new deep caves, using dye traces in cave streams to probe Arabika’s potential depth. In 2001 a team led by Ukrainian Yuri ...