| alanformstone.com | | Pictures and descriptions of cave diving trips in Mexico and Florida, including some of the more off the beaten track sites. |
| Blue Holes Foundation | | 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. |
| Cave Diver's Forum | | Multiple discussion boards feature gear exchange, trip reports, incident reporting and analysis, buddies and resources. |
| Cave Diving in Greece | | The exploration of Drakos and Polidrosso together with team, equipment and contact information. |
| Cave Diving Rocks | | South Georgia enthusiast offers statistical summary of his dives, articles, photos, projects, tips, files. Includes contact form. |
| Caveboard | | Discussion group covering all the various aspects of cavern & cave diving worldwide. Posts, calendar, members list, advice, locations, trip reports. |
| CDAA | | Cave Divers Association of Australia. |
| European Karst Plain Project | | The EKPP explores underwater caves, mainly in France. Projects, images, video, training information and contacts. |
| Expedition Divers | | Extreme underwater video production and services. DVDs for sale, technical diving instruction, expeditions and information on available services. |
| Florida Cave Diving | | Information on cave diving in the North Central Florida springs area and Mexico. Pictures, descriptions and links. |
| 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. |
| Jacksonville Diving | | Includes guides to area locations, marine forecasts and tides, essays, photos and links. |
| Mexico Profundo | | An organisation undertaking exploration, scientific study and mapping of water filled caves and related features in Mxico and Central America. |
| NACD | | National Association For Cave Diving based in Florida, USA. |
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