By the way, this is not naturally occurring. This is a result of a Russian screwup in 1971.
Dumping ground for a scorching hot hot sauce?
what did the russians do to make this?
BTW there is a coal fire in Centralia Pennsylvania that has been burning underground for over 50 years I think.
There is no way to put it out except to trench out and extinguish every sinlge thing
A tire fire is another example- it creates its own oxygen and so you can’t put it out very easily