Sounds like that is something else. It doesn't look the guy out to explore "rock hole" ever made it there. As typical, information is hard to come by for these mostly unknown sites.
When we put together our Blue Hole Mapping Project, we had several contacts that lived in the vicinity of the owner and still it was hard to get info. The pond is nothing more than a 40' undeveloped Blue Lagoon but that was one of the most fun outings we've had. We did it up nice with a team of 20 with assigned tasks from underwater search teams, surface support teams, admin teams checking divers in and out of water, IT guys inputting diver notes into Autocad onsite, refreshment stand, and first aid tent. We rotated so everyone got plenty of water time. We had a 40' motorhome, a jonboat, depth sticks, gps units, bullhorns, walkie talkies, O2 kits, and the kitchen sink. Looked almost like a real operation!
Below are a few pics, see dozens more in our
CHUM Gallery.