In the Perm region mine has caused huge gaps in residential areas.

In the Perm region extracting potash mine caused the huge gaps in residential areas.
Initially, production was located outside the city limits, and everything would be fine, but the city has grown closer to mine.
Over time, the house turned out to be above the mine. Under the city is now 85, 2 million. Cu. m., and salt water,
surface settles, crack houses and produce large crevices that are growing.