Related images and discussion here: http://siberiantimes.com/science/casestudy/news/n0678-200000-year-old-soil-found-at-mysterious-crater-a-gate-to-the-subterr

Related images and discussion here: http://siberiantimes.com/science/casestudy/news/n0678-200000-year-old-soil-found-at-mysterious-crater-a-gate-to-the-subterranean-world/ http://siberiantimes.com/science/casestudy/news/n0678-200000... http://siberiantimes.com/science/casestudy/news/n0127-dozens-of-mysterious-new-craters-suspected-in-northern-russia/ http://siberiantimes.com/science/casestudy/news/n0127-dozens... https://news.ycombinator.com/item?id=9120690 https://news.ycombinator.com/item?id=9120690