Sinkholes aren't all that uncommon in Florida. Comes with the limestone "bedrock". During high ground water times, the moving water underground dissolves the limestone. During low ground water times, the support of that water on the "roof" is lessened and collapses can take place.
Sometimes they may appear to be nothing more than a shallow depression in the ground, indicating small collapses in the past, so the landscape is pretty much dotted with them. Heck there are several small ones on my property. There is an impressive one at a state park north of us right at the county line between Wakulla and Leon counties
I'm sure developers just fill them in when they find them on a project, so you might never know that your house was built right on top of one.
Heck, when we bought the property here, there was a capped off 4 inch pipe from an existing well. We had the cap removed to hook up our own pump and the guy doing the install ran a plumb line down the pipe. He hit water at 20 ft, and wanted to see how deep it was. He ran out of his 100 ft line without hitting bottom. So, wouldn't surprise me in the least to learn that our house is build overtop of a huge underground cavern.
Sinkhole in Dunedin
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