NSS-CDS
Last updated September 7, 2026
The Cave Diving Section of the National Speleological Society is a cave-diving-specific certifying body, founded in 1973 out of NSS cave-diving members' meetings and chaired first by Sheck Exley. It has been the world's largest cave diving training organization since the late 1970s, running its own dedicated cavern-through-full-cave progression rather than a broad multi-discipline technical catalog.
Tec Courses Offered by NSS-CDS
Instructors Certified by NSS-CDS
Dive Centres with NSS-CDS Instructors
We're still building out the directory country by country, so this list isn't every NSS-CDS instructor or dive centre in the world — more locations are coming soon.