In Siberia, the Batagaika Crater is a 1km long, 50m deep gash in the earth -a "megaslump"- and it is getting bigger. At the very bottom of the exposed outcrop, the permafrost dates back 650,000 years. Scientists say the megaslump was caused by deforestation and mineral exploration and the thawing of the permafrost is making it worse. It releases carbon monoxide and methane, accelerating climate change.
This picture is from
ScienceAlert but the original story I saw was from
BBC Reel