European Karst Plain Project
- The EKPP dives primarily in Frane using DIR diving techniques. Project information, training, history, images and videos.
- http://www.ekpp.org/

Pluto Dive
- Located in Playa del Carmen, Yucatan, Mexico and providing training for cenote and cavern diving. Training and dive site details, local history, pictures and accommodation options.
- http://www.plutodive.com/index_english.htm

Underwater Caves of Hungary
- Information and pictures of a number of caves in Hungary.
- http://www.cavediver.ini.hu

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.
- http://www.blueholes.org/

Expedition Divers
- Extreme underwater video production and services. DVDs for sale, technical diving instruction, expeditions and information on available services.
- http://www.expeditiondivers.com

alanformstone.com
- Pictures and descriptions of cave diving trips in Mexico and Florida, including some of the more off the beaten track sites.
- http://alanformstone.com/

Cave Diving Rocks
- South Georgia enthusiast offers statistical summary of his dives, articles, photos, projects, tips, files. Includes contact form.
- http://awooten.1afm.com/mysite/index.html

SMART Cave Diving Policy
- Safety information from the San Marcos Area Recovery Team, National Speleological Society, USA.
- http://www.smartdivers.com

NSS Cave Diving Section
- The main organisation for cave divers in the USA.
- http://www.nsscds.com/

Caveboard
- Discussion group covering all the various aspects of cavern & cave diving worldwide. Posts, calendar, members list, advice, locations, trip reports.
- http://www.caveboard.com

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.
- http://www.cavediving.com/

German Cave Diving Mailing List
- A mailing list established to promote an exchange of cave diving related issues via Internet.
- http://cave.lawo.de/jbohnert/mailinglist.htm

Cave Diving in Greece
- The exploration of Drakos and Polidrosso together with team, equipment and contact information.
- http://www.cavediving.gr

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.
- http://www.mexicocavediving.com

Cave Diving Group
- The official web site for the CDG of Great Britain.
- http://www.cavedivinggroup.org.uk

Loco Gringo Underground
- A basic introduction to safe cave diving with some nice photographs.
- http://locogringo.com/cavediving/

Cave Divers Association of Australia
- The national organisation for Australia.
- http://www.cavedivers.com.au/

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.
- http://www.caves.org/project/qrss/

Hooked On Cave Diving
- Underwater photographs of the cenotes in the Riviera Mayan region of Mexico.
- http://www.scubadr333.com

NACD
- National Association For Cave Diving based in Florida, USA.
- http://www.safecavediving.com

Mexico Profundo
- An organisation undertaking exploration, scientific study and mapping of water filled caves and related features in México and Central America.
- http://www.mexicoprofundo.org/

Cave Diver's Forum
- Multiple discussion boards feature gear exchange, trip reports, incident reporting and analysis, buddies and resources.
- http://www.cavediver.net

CDAA
- Cave Divers Association of Australia.
- http://www.cavedivers.com.au/welcome.htm

Woodville Karst Plain Project
- An organisations undertaking exploration of deep underwater caves in North Florida.
- http://www.wkpp.org/