alt Hacker NewsThis is quite normal thing to do for many open pit mines or rather hard not to do if the pit goes below the water table.
There are some very nice natural swimming pools in the local area thanks to that, for example:
https://www.kudyznudy.cz/aktivity/koupaliste-u-libuse-v-lule... (stone quarry, IMHO one of the best summer swimming pools anywhere)
https://cs.wikipedia.org/wiki/Zatopen%C3%BD_lom_v_Blansku (stone quarry)
https://www.jednoustopouceskem.cz/listing/lom-kaolinka-prime... (kaolin mine)
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The "interesting" part is that the mine closing will significantly reduce the water supply to Berlin on its own, and filling the pit will probably raise the issue to possibly catastrophic levels: https://www.umweltbundesamt.de/presse/pressemitteilungen/spr...
I go often to a quarry lake in Canmore (near Banff)
I recently went swimming in one of these submerged mines/quarries in North America. This one flooded during a severe hurricane: https://en.wikipedia.org/wiki/Portland_Brownstone_Quarries
Luleč is really amazing and the food they have there is top.
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Czech republic has some really nice quarries and dams where you can swim for free or next to free. One thing I've noticed is that Czechs only seem to go to such places when it's really really warm. So they're often empty even when they're perfect for swimming. At least the ones near me in Plzeň. I grew up swimming in the Atlantic so my idea of swimming temperature may be different to average Czechs!