MHK once bubbled...
As far as I know I believe Wakulla and perhaps Sally Ward, but Chickdiver can say more certain then I could.. You ask why?? Because the WKPP is working with NSS and the state of Florida for important research projects. For example last weekend, in a joint effort with the NSS, they put in flow meter's and several other environmental tools to help gather information about the protection and preservation of the environment. Many of these projects involve time consuming set up's that require stage bottles, scooters and a whole host of other support tools be precisely placed at very strategic points days, if not weeks, in advance. Divers lives depend on those bottles and/or scooters being in precise places. Unlimited access to those projects creates an unacceptable safety risk that an unknowing diver could move, steal or otherwise remove a life saving piece of equipment..
After thinking about it I decided to comment on this. Lots of us do cave dives that require advance set up. Sometimes on the way into the cave and sometimes on a previous dive. If some one tampered with out equipment the result would be the same for us as it would be for the WKPP.
I think you would be hard pressed to find a cave diver who didn't know better than to mess with another divers staged equipment. I also think you would be hard pressed to find a cave diver who would do it because they know it could cost another diver their life.
Also, we don't plan things such that our live depend on any single bottle so a bunch of stuff would need to be tampered with to do more than make us real mad.
We have had shallow bottled left in the basin messd with by free divers and OW divers but I've never had anything touched by a cave diver.
I don't at all see this as a valid reason to have the sites closed. It would, IMO, be reasonable to close to the public during big dives just to keep things as simple as possible by limiting traffic. Although if I want to do a big dive in Cannonball I just have to work around any one else who wants to dive there at the same time.
I have also heard the argument (not from MHK) that divers would drop like flies if they were let in there. I don't buy that either. We have a deeper way colder cave in Missouri. We dive it. We're not dropping like flies and we don't need any one to protect us.
There may be sites that should be closed for conservation purposes, I don't know, but I would like to be able to dive all the others. Wouldn't you?