History Shockers on Instagram: "In 1991, a massive Metallica show in Moscow pulled in more than 1.6 million people, turning the concert into one of the biggest gatherings ever seen for a live performance. The crowd was so dense and the heat so intense that military helicopters hovered overhead, swooping low and releasing water to keep people from overheating."

ThePopRewind on Instagram: "In 1991, Metallica performed in Moscow for a crowd estimated at over a million people, one of the largest rock gatherings in history. Because the event took place during a politically tense period, the Soviet military was heavily involved in security. Helicopters were flown low over the audience to monitor the crowd and maintain control. But the close passes created dramatic gusts of wind, making it look as though the helicopters were cooling the crowd. #metallica #mo