Udachnaya Pipe. Amazing Photos (20 pics)
The Udachnaya pipe is the largest diamond deposit in Russia and one of the largest in the world.
According to Wikipedia, it is an open-pit mine and it is almost 600 meters (1 968 ft.) deep.
When you are standing on the top, the huge Caterpillars look tiny.
And when you are at the bottom of the pipe, it looks... well, it looks just amazing (the 2nd photo).