KNOW: What is The Door to Hell
The Gates of hell also known the Door to hell or Darwaza gas crater was created in 1971 when a Soviet drilling rig accidentally punched into a massive underground natural gas cavern, causing the ground to collapse and the entire drilling rig to fall in. Having punctured a pocket of methane gas. It is a natural gas field is located in Derweze, Turkmenistan.

The origin of the fire still remains a mystery but, according to some reports,
the flames have been burning since 1971. A group of Soviet geologists
accidentally created the crater, searching for oil, according to the
Smithsonian Magazine.
It is located in the LOWER PARTS OF EARTH and it's burning for the last 49
years ago.
The engineers set up a drilling rig and operations to assess the quantity of oil available at the site. Soon after the preliminary, the survey found a natural gas pocket, the ground beneath the drilling rig, and camp collapsed into a wide crater and the rig was buried with no casualties.
Expecting dangerous releases of poisonous gases from the cavern into nearby towns, the engineers considered it advisable to burn the gas off. It was estimated that the gas would burn out within a few weeks, but it has instead continued to burn for 49 years and is expected to keep on burning.