🇷🇺 The Mirny diamond mine in Russia is one of the largest pits dug by humans on Earth, and its scale is almost impossible to grasp at first glance. The open-pit mine stretches over more than a mile and goes deep into the ground, creating powerful air currents that move unpredictably inside and above the crater. These whirlwinds have become such a hazard that authorities have banned any helicopter flights over the mine.