The Survey and Cartography of The Underwater Caves of Quintana Roo Mexico. Includes exploration reports, surveys, descriptions, maps and contact info.

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.

Dedicated to exploration and scientific investigations of underwater caves in The Bahamas. Includes general information, photos and a list of publications. Located in Charleston, South Carolina, United States.

Multiple discussion boards feature gear exchange, trip reports, incident reporting and analysis, buddies and resources.

The EKPP dives primarily in Frane using DIR diving techniques. Project information, training, history, images and videos.

Information and pictures of a number of caves in Hungary.

A blog about seeking excellence in cave diving in Mexico. Photos, surveys and information on equipment, diet, fitness and training.

Underwater photographs of the cenotes in the Riviera Mayan region of Mexico.

Safety information from the San Marcos Area Recovery Team, National Speleological Society, USA.

A mailing list established to promote an exchange of cave diving related issues via Internet.