Mysterious crater appears in Siberian tundra

Discovered by journalists with Vesti Yamal TV in Russia, a 164-ft crater in Siberia joins the other mysterious holes (previously, previously) thought to be the result of methane explosions. Record temperatures in the region accellerate the thawing of permafrost, releasing the trapped gases.

This is the 17th such feature, called a hydrolaccolith, that scientists have found across the thawing Siberian tundra, according to The Siberian Times. Researchers discovered the first one in 2014.