"A geologist from Novosibirsk has set up a new hypothesis of the explosion in Podkamennaya Tunguska, which took place on June 30, 1908. It was not a meteorite that caused such extensive destructions and conflagration, but a fluid jet, which had shot up under high pressure from the interior of the Earth.

...The scientist assumes that the gases associated with the oil deposits, and methane produced in the depths of coal beds were accumulated under a thick cover of basalts and then they broke free one day. It seems that a moderate earthquake could have promoted the process. "