Batagai / Batagaika Crater (Siberian Permafrost Crater)

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For more on the background to this - the world's largest thermokarst depression / crater - check the Wikipedia article ...
Batagaika crater

The Batagaika crater is a thermokarst depression in the Chersky Range area. The biggest permafrost crater in the world, it administratively it belongs to the Sakha Republic, Russia.

The depression is in the form of a one-kilometre-long gash up to 100 metres (328 feet) deep, and growing, in the East Siberian taiga, located 10 km (6.2 mi) southeast of Batagay and 5 km (3.1 mi) northeast of the settlement Ese-Khayya, about 660 km (410 mi) north-northeast of the capital Yakutsk. The structure is named after the near-flowing Batagayka, a right tributary of the river Yana. The land began to sink due to the thawing permafrost in the 1960s after the surrounding forest was cleared. Flooding also contributed to the enlargement of the crater. Paleontologists have found Ice Age fossils buried in the mud around the rim of the crater.The rim is extremely unstable as there are regular landslides into the crater and the permafrost is constantly thawing. The crater is currently growing in size.
https://en.wikipedia.org/wiki/Batagaika_crater
 

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This 2018 ScienceAlert article also provides an overview ...
There's a 'Doorway to The Underworld' in Siberia So Big It's Uncovered Ancient Forests

It's no secret that Siberia's permafrost is on thin ice. Conditions are varying so much that huge holes are appearing out of nowhere, and, in some places, tundra is quite literally bubbling underneath people's feet.

But one of the biggest craters in the region, known by the local Yakutian people as the 'doorway to the underworld', is growing so rapidly that it's uncovering long-buried forests, carcasses, and up to 200,000 years of historical climate records.

Known as the Batagaika crater, it's what's officially called a 'megaslump' or 'thermokarst'.

Many of these megaslumps have been appearing across Siberia in recent years, but researchers think Batagaika could be something of an anomaly in the region, located around 660 km (410 miles) north-east of the region's capital city of Yakutsk.

Not only is the crater already the largest of its kind, almost 1 km (0.6 miles) long and 86 metres (282 feet) deep, but it's getting bigger all the time. ...
FULL STORY: https://www.sciencealert.com/siberi...nnia-old-forests-and-carcasses-climate-change
 

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