Mexico Profundo

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

NSS Cave Diving Section

– The main organisation for cave divers in the USA.

Quiet Diver

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

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.

Rebreather Pro

– Leading cave diver Jill Heinerth espouses the benefits of rebreathers for cave diving

Rob Palmer Blue Holes Foundation

– A nonprofit organization dedicated to the scientific and physical exploration of water filled caves within the Bahamas and related environment.

SMART Cave Diving Policy

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

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.

Woodville Karst Plain Project

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

alanformstone.com

– Pictures and descriptions of cave diving trips in Mexico and Florida, including some of the more off the beaten track sites.