The water is way clear. Its 120' to the bottom, however open water ends at about 60' at the cave warning sign. Its a state park so its $5 to dive, you have to have a buddy, and you can not carry lights if you are not cavern or cave cert. If you are caught diving solo or with lights then you are given a ticket, and they ain't cheap. The flow from the boil is very strong. Very cool limestone formations due to the force of the water over the walls over millions of years. Over the years the walss have been defaced by stupid people that insist on carving their names into the limestone. That is illegal, just so you know, or if you see someone doing that you can stop them, or notify a ranger. Oh the rangers...they are very strict there. Last few times I was there, there were a bunch of cool armoured catfish there.
When you enter the water, don't put your fins on, walk along in the water along the right side til you get to the basin (no point in swimming against the current wasting air) and after your dive do a shallow drift dive down the spring run back to the steps. Oh and the walk from the parking lot to the water is a bitof a haul.
Oh and I forgot to say, it is illegal too to take fossils from a state park.