Located in the Kara-Kum desert of Turkmenistan is the village of Darvaza (Derweze) near to where, in 1971, a team of Soviet prospectors allegedly drilled into a large chamber filled with natural gas. The roof of the cavern collapsed leaving a crater-like sinkhole some 25 metres deep with a diameter of approximately 60 - 70 metres. It soon became evident that natural gas was still rising into the crater from even deeper sources and the story goes that the decision was made to ignite the emissions rather than risk either a concentrated build-up of gas or local poisoning. According to various sources it has burned continuously since then and has apparently been named The Gate to Hell by the local people. However, another source that spoke with the guides from the region claims that it is a wholly natural phenomenon.