The Raspadskaya mine explosion was a mine explosion in the Raspadskaya mine, located near Mezhdurechensk in Kemerovo Oblast, Russia, which occurred on 8 May 2010. It was believed to have been caused by a buildup of methane. The initial explosion was followed by a second approximately four hours later which collapsed the mine's ventilation shaft and trapped several rescue workers. By 18 May 2010, 66[1] people were confirmed to have died with at least 99 others injured and as many as a further 24 unaccounted for.