In 1971 in the Karakum desert near Darvaza village in Turkmenistan, the Soviet petroleum engineers accidently tapped into an underground cavern filled with natural gas. The ground just below the camps and the drilling rig collapsed becoming a natural gas crater. Geologists set it on fire to prevent the spread of deadly methane gas, and it has been burning continuously since then: http://bit.ly/Darvaza_Gas_Crater












