I'm curious to know the opinion of the group here about this recent development. Since getting my cavern certification last year I have dove Madison Blue around half a dozen times. When I finished my course my instructor even said it was a great cavern. On a recent dive trip I met a guy that told me he was denied entry to Madison recently because he was just cavern certified. I figured it must have been a misunderstanding. After looking into it, I think the rule has recently been changed. On the Florida Parks Madison Blue website, there is now a specific " no cavern diving" rule. I am sure that this rule was not there in October 2010 because I checked the page before driving down for a cavern dive. At that time the rule was just "no open water diving" and "stay within your limits". I was thinking about finding out if there were committees or appointees that set these rules and appealing to them to change the rule back, but first I'd like to ask more experienced divers for their opinion. Other than the obvious benefit to the cave environment that lowering the number of divers and raising the level of diver has, are there other reasons that a cavern diver shouldn't be able to dive within their limits at Madison Blue?