If I found myself falling into the pit of the Earth's belly, I would just be shaking my head thinking one and a zillion chance in falling into a sink hole, like winning three lottery's in one lifetime. And yet I am falling in this hole on my way to a certain death, INSTEAD of winning the lottery.....
It actually happens all the time there, the limestone karst gets eaten away by underground streams and when it gets eroded enough the ground above the stream collapses
Isn't that the same area where they have vast underground rivers? Seems I saw something about that on Discovery channel last summer. Some university geologists were scuba diving in them and making surveys of water temp and pH while mapping the caves. Not sure if this is the same area, though. In any case, they went on for hundreds of miles.
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