No, these aren't natural disasters, craters from a huge meteorite, or the burrows of some massive worm from space. These are mines, created by the Soviet Union to harness the awesome natural resources of Russia and Eastern Europe. But they look like a glimpse of Hell itself.
We already showed you some wonderful old mines that you can still visit, but here are some pictures of Soviet ones that will blow your mind.
The Kuznetsk Basin, Western Siberia, Russia, one of the largest coal mining areas in the world, with dozens of opencast mines
The kimberlite pipe Mir (means Peace) in Mirny, Eastern Siberia, Russia, a diamond mine opened in 1955. Its 1722 ft (525 m) deep quarry is one of the largest in the world, and the airspace above it is closed for helicopters because it could suck them with its downward air flow.
The largest gypsum minefield in Europe, Novomoskovsk, Russia, discovered in 1929. The total length of the tunnels is over 310 miles (500 km).
(via English Russia)