Scientists identified 2 gas-filled cavities inside the bulging mound which merged into one, and then exploded. Professor Vasily Bogoyavlensky said: ‘The survey of C17 crater was the most difficult task I had ever faced in the Arctic’ https://t.co/Y13yP7S3tm pic.twitter.com/GN2r2ZTz3z

— The Siberian Times (@siberian_times) February 26, 2021