We have this in Germany, in the Ruhr area. If they do not pump water non-stop, the complete area would be flooded[0]. This is because coal mining has been brin

We have this in Germany, in the Ruhr area. If they do not pump water non-stop, the complete area would be flooded[0]. This is because coal mining has been bringing the complete cities below the natural level of the water table. Costs are taken care of by a foundation. [0]: https://de.m.wikipedia.org/wiki/Ewigkeitskosten https://de.m.wikipedia.org/wiki/Ewigkeitskosten Sadly no English version but some pictures.