alternatehistory.com

So, I read somewhere that the Tunguska event occurred at about the same latitude as St Petersburg, and that if it had been delayed about 6 hours it would have hit St Petersburg. So, at about 7:14 AM on the morning of July 30, 1908, a comet airbursts over St Petersburg, at an altitude of about 8 km, and with a force of about 10 megatonnes. What happens next?
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