Technically, all sinkholes in active karst zones are growing and could collapse. Collapse is imminent on a geologic timescale. Fortunately, I don't live on a geologic timescale.
That said, I'd probably avoid the southeastern-most sinkhole, but that doesn't mean I wouldn't investigate the others further if I lived close by.
We recently found a cave in the bottom of a freshly-opened sinkhole. The walls of the sinkhole will probably continue sloughing off dirt and roots for the next 50 years, but we were more than happy to explore the cave despite the risks.
-Jon



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