Cave Fresh water
This is a cenote, essentially a technical dive. Most of the dive is dark, light required. Also there is no open water overhead for most of the dive. We went on a guided dive. There are two cenotes in the immediate area a short walk from parking. It was a fantastic dive with interesting geological formations and clear water conditions. You do go though a halocline at some points in the dive profile.
3 Cenotes at this site: Chac-Mool, Kukulkan, and Big Brother
Stalagtites at the cave