Bloodpearl13,
I don't want to respond like I'm an expert as I may not know what I am talking about (a little knowledge is dangerous). Some sinkholes are over 100 feet deep (Big Dismal in Tallahassee). Warm Mineral Springs in Sarasota is over 200' deep - I have termed this site a sinkhole whereas it may actually be a spring (it's just a water hole in the middle of a field). It is so different from the other Florida springs and has no apparent flow and thus I'm calling it a sinkhole - and I could very well be wrong.
There are many small sinkholes that open up and are clearly not connected to the aquifer. Large ones (I believe) like Warm Mineral Springs are connected. Having never explored the bottom of the large ones, I can only surmise but I think that at some point the vents become too narrow for human passage (much like many of the springs).
I am only responding to this post as I mentioned freediving in sinkholes in earlier ones. Those diving experiences and just living in Florida are my only sources of information and so I may be way off base.
Scott
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