Massive craters about 100 feet deep and 20 meters wide have been spotted in Siberia, CNN reports.

  • A Russian TV crew flying over the Siberian tundra noticed the holes.
  • Scientists don’t know what created the huge holes. But the recent spotting is the ninth one found since 2013.

What causes the holes?

Initial theories — which came out after one hole was discovered in the Yamal Peninsula in northwest Siberia — included “a meteorite impact, a UFO landing and the collapse of a secret underground military storage facility,” CNN reports.

  • Scientists now think the giant hole is connected to a blowup of methane gas, which would be the result of warming temperatures in the area.
  • “Warming and thawing of surface soil weakens the frozen ‘cap,’ resulting in the blowout that causes the craters,” Sue Natali, Arctic program director at Woodwell Climate Research Center, told Gizmodo.
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Why this hole is different

However, according to The Daily Express, researchers remain confused because the hole looks like something exploded outwards rather than collapsing inwards.

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Scientist Dr. Evgeny Chuvilin, a leading researcher at Skolkovo Institute of Science and Technology, said the hole’s quick creation is also a mystery, according to The Daily Express.

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  • “These are the colossal forces of nature that create such objects. The frost heaving that precedes a crater usually happens quite quickly, over one to two years, and this sudden growth is hard to observe, so almost all craters were discovered after everything had already happened.”
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