Today, the fault measures around a kilometer in length, 800 meters in width and 100 meters in depth, making it the largest permafrost thermokarst sinkhole in the world. Its shape is reminiscent of a gigantic mollusc with a tail.
Specialists of Rospotrebnadzor in the Leningrad Region are checking 12 barrels with unknown substance near Lake Voloyarvi.
Eyewitnesses posted photos and videos on social networks showing people walking knee-deep in water.
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