The Batagaika crater is the world's biggest permafrost crater or mega-slump.
First observed in the 60's, it is already more than 1 km long and more than 100 m deep with the perimeter increasing by about 10 m per year.
World's largest permafrost crater
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By hhgygy @ 2023-07-30 13:38:47
Detailed research here https://bombarman.livejournal.com/34505.html
at the end of the topic there is a link “Continuation 4”, I wrote about it there (where are the screenshots of Antarctica)
But it’s better, of course, to read the entire study.