61 cave dive sites in United States.
Biggest areas: Hawaiian Islands (14), Florida (12), California (5), Mariana Archipelago (5) and Hawaii (2).
Recorded maximum depths range from 3 m to 61 m (30 of 61 sites have a depth).
By level: 18 beginner, 6 intermediate, 7 advanced and 2 technical.
Species confirmed at these sites by diver sightings (three or more independent divers) or by two or more independent sources, with the number of sites each is confirmed at.