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by jodrellblank 403 days ago
The Lake Peigneur diaster in 1980, drilling for oil in a lake bed in Louisiana they accidentally drilled down into a salt mine and drained the freshwater lake into it. That disolved the salt pillars supporting the mine's roof and created a 65 acre sink hole and backfilled the whole area from the saltwater bay.

https://en.wikipedia.org/wiki/Lake_Peigneur