Very brave to go this time of year, but excellent dive. Hopefully you're certified/trained/experienced for this type of dive...
I've been once, but I caution you that my memory for the directions is not much better than if I was led there blindfolded. I also seem to remember the directions on some of the websites are in fact misleading (deliberate?).
Anyway, what I remember is goto Chassahowitzka Wildlife Management Area, pay your money, take the left fork, come to a shelter area, go left again, follow the road through a canopy area and when you clear this there is a space off the road on the right for parking. About 100' further down the road is a a non-vehicle offshoot to the right that meanders into another canopy area (this is the point where you lug your gear for 0.5 miles through mosquito-infested swamp and curse thinking doing this in September was a good idea). At the end of that trail you basically keep going straight through the swamp ~ 100 meters (possibly following the red-orange ties?) to a clearing and swamp. Carefully enter the water, look around with your mask and you will see the floor drops out into a beautiful 130' and deeper cavern/cave.
Someone may need to correct my directions?