The city of Berezniki, in Russia’s Ural mountains, is slowly sinking into the earth. The city of more than 150,000 individuals was built directly on top of a potash mine, which was standard practice during Soviet times. After nearly a century of extraction, deep voids were left underneath the city. The ceilings of these huge underground caverns are supported only by walls and pillars of soluble salt. In 2006, when a freshwater spring began flowing into the mine some 720 to 1,500 feet below the surface, it dissolved the supporting pillars and the city came crashing down.
Listen beautiful relax classics on our Youtube channel.
Source: amusingplanet.com