Quote:
Originally Posted by Camaro_Corvette
Some of those shots do not look 30 feet deep. They look like they go forever.
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Kentucky sits on top of soft limestone that is riddled with underground rivers and reservoirs. That limestone filtered water is part of what makes Kentucky bourbon what it is rather than just being whiskey. The Bowling Green area sits right on top of the Mammoth Caves, the largest known cave system in the world, which is constantly growing. I would imagine that a lot of the concern about stability has to do with that knowledge and those endless holes you are seeing. They may open up to a cavern hundreds of feet deep.