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These articles are pretty much a list of awesome cave diving sites. Mount Gambier, Nullarbor Plain, Florida, Ewen's Ponds and Piccaninnie Ponds.

Technically this isn't a sinkhole, if you read the description you'll see that they were drilling for gas. There's a number of sites similar to this, several in the US and Russia that I've read about. The gas, coal or other fuel source burns for decades. There was a lot of concern that...