Is it possible to hike and camp in the Popigai Crater (Siberia) in winter?

The crater is supposed to be 100km in diameter and up to 10km deep? Is that really true? Then you could live there in winter at a depth of 1500-2000m, when the surface is around -20°C, Siberian cold, right? ChatGPT says: At a depth of 1600 meters, the temperature would likely be between 12°C and…