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BRENT: Seven giant craters have mysteriously appeared in northern Siberia, possibly due to methane gas released from melting permafrost. Check out these jaw-dropping photos of the strange geological structures.
This crater, in the Yamal Peninsula, was discovered in 2014 by helicopter pilots 19 miles (30 kilometers) from Bovanenkovo, a major gas field in the Yamalo-Nenets autonomous district.
Four Arctic craters can be seen in this satellite image: B1, the famous Yamal hole located 19 miles (30 kilometers) from Bovanenkovo; B2, the recently discovered crater located 6.2 miles (10 km) south of Bovanenkovo; B3, a crater located 56 miles (90 km) from Antipayuta village; and B4, a crater located near Nosok village, north of the Krasnoyarsk region near Taymyr Peninsula.
