March 6, 2007 —A pair of cave divers said Monday they have found subterranean passages in Mexico's Yucatan peninsula that constitute the world's longest underwater cave system.
British cave diver Steve Bogaerts said he and Robbie Schmittner, of Germany, found flooded underground passages connecting two previously known cave systems — a discovery that shows how interconnected and vulnerable the Yucatan's fabled underground water system is.
Gene Melton, chairman of the Cave Diving Section of the U.S.-based National Speleological Society, a nongovernmental association that tracks cave explorations, confirmed the discovery.
For thousands of years, Mayan Indians depended on water found in the caves and in lakes formed by sinkholes — areas where the caves' ceilings collapsed, opening them to the surface. The lakes dot the Yucatan peninsula, now one of the world's fastest-growing sites for tourism and resort developments.
Bogaerts said his dives proved a connection between the Nohoch Nah Chich caves and the Sac Actun system, which together measure 95 miles in length. That connection shows that many of the seemingly isolated watering holes are part of a single larger system, he said.
The longest previously known submerged cave system is the 91-mile Ox Bel Ha system, located in the same general area, according to documents posted by the Speleological Society on its Web site.
