- The Blue Holes Foundation
- Explore the foundation's goals, publication listings and general cave education page. With cave related articles.
- Cave Diving Group - Great Britain
- Browse through featured articles, message board, newsletter and training program details. Plus general notices.
- European Karst Plain Project
- Chronicles the exploration efforts of the group. With project information, training details and media gallery.
- Grupo de Exploracion Ox Bel Ha
- Includes group's history, underwater cave system exploration details, media gallery, maps, related articles, and FAQs section.
- National Speleological Society - Cave Diving Section
- Ushers cave diving facts, membership information, accomplishment report, news and events updates, and media gallery.
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