Just came across this amazing picture on ICIS Chemicals Confidential which has added to my ever-expanding list of places I really do not want to work.
It shows the Berezniki 1 potash mine in Russia's Perm region. Apparently, the sinkhole was caused by flooding, and is now threatening the nearby railway line.
So, for the record, I do not want to work near the potash mines of Russia. Or in Russia, come to that.