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.

The national organisation for Australia.

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

The official web site for the CDG of Great Britain.

The exploration of Drakos and Polidrosso together with team, equipment and contact information.

Covers what is involved, who can be a diver, when, where and how. Includes safety rules for diving in Florida and Mexico.

Discussion group covering all the various aspects of cavern & cave diving worldwide. Posts, calendar, members list, advice, locations, trip reports.

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

Extreme underwater video production and services. DVDs for sale, technical diving instruction, expeditions and information on available services.

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.

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

An organisation undertaking exploration, scientific study and mapping of water filled caves and related features in México and Central America.

National Association For Cave Diving based in Florida, USA.

The main organisation for cave divers in the USA.

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