At least seven newly created mysterious craters have now been officially discovered in Siberia, though satellite imagery suggests there may be as many as 20. The discovery of the first three last year caused a small media storm as no one had any idea how the craters had come about. Since that time, one team of researchers actually went down inside one of the craters to see what might have caused it to come about. That expedition did not reveal any hard facts, but most geologists now suspect that the craters came about due to warming in Siberia, leading to melting permafrost, which led to underground gases filling underground cavities, which led, eventually, to blasts that caused the creation of the craters.
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