The Door to Hell EarthCache During rule of Soviet Russia, back in ???? when geologists were conducting ???? drilling in Kara-Kum desert and discovered an underground chamber close to the village of Darvaza. The discovery of the chamber was accidental and resulted in drilling rig collapsing, leaving giant crater. The idea of burning the ???? until the area was stable, then resuming drilling. When they first lit the crater on fire, they thought the fire would go out after a few days As it turns out, the supply of ???? below the crater is near infinite as the crater’s been burning since ???? without interruption. Photo Gallery Select the correct combination to fill in the blanks. 2002 - Red Solo cups 1971 - Natural gas 1935 - Coal 1949 - Low quality crude oil 1968 - Farmer Brown Hay 1949 Propane