National Association For Cave Diving based in Florida, USA.

The national organisation for Australia.

Cave Divers Association of Australia.

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

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

An organisations undertaking exploration of deep underwater caves in North Florida.

The main organisation for cave divers in the USA.

The official web site for the CDG of Great Britain.

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

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