SMART Cave Diving Policy - Safety information from the San Marcos Area Recovery Team, National Speleological Society, USA. Quintana Roo Speleological Survey - The Survey and Cartography of The Underwater Caves of Quintana Roo Mexico. Includes exploration reports, surveys, descriptions, maps and contact info. Mexico Profundo - An organisation undertaking exploration, scientific study and mapping of water filled caves and related features in México and Central America. Cave Diver's Forum - A place on the Internet for civil discussions of anything cave diving related. This site contains plenty of comments, stories, reports, and opinions. Main cave diving forum for USA cave divers. Cave Diving Group - The official web site for the CDG of Great Britain. Grupo de Exploracion Ox Bel Ha - Dedicated to the continued exploration of the world's largest underwater cave system and the largest cave system in the Mexican Republic, located in the Yucatan Peninsula. Includes members, history of the system, maps, FAQs, articles. The Cave Diving Website - Covers what is involved, who can be a diver, when, where and how. Includes safety rules for diving in Florida and Mexico. Quiet Diver - A blog about seeking excellence in cave diving in Mexico. Photos, surveys and information on equipment, diet, fitness and training. Cave Diving Down Under - The definitive resource for Australian cave diving containing: expedition and dive reports, equipment reviews, information on cave diving sites across the country, cave maps, cave diving systems and training information. NSS Cave Diving Section - The main organisation for cave divers in the USA. RebreatherPro - Leading cave diver Jill Heinerth espouses the benefits of rebreathers for cave diving