Those pictures of the Guatemala Sink Hole are spooky. I've never seen anything remotely like that, and central Florida, where I'm from, is definitely sinkhole country. They are THE primary topographic landform generator in Karst topography. Limestone is water soluble, especially since the groundwater is slightly acidic from dissolved CO2. The result is large systems of caves and underground waterways, manifesting themselves as springs where the limestone strata intersect the surface.

Periodically, the roof of one of these caves will collapse, leaving a shallow, circular crater that rapidly fills up with water. The Lutz area north of the University of South Florida is pocked with these features, and they have a tendency to develop overnight. One of them swallowed up an entire Porsche dealership in Winter Haven one night!

But I've never seen anything this deep before in Florida. The underground cavern must be very large and very deep down...if it is indeed a sinkhole....ooooeeeeoooooo.....