Explosive Connections! · 5:36pm May 15th, 2018
This article came up as I read the news.
http://www.bbc.com/earth/story/20160706-in-siberia-in-1908-a-huge-explosion-came-out-of-nowhere
It never ceases to make me smile.
Just thought I'd let you in on some of what goes on in my head.
My guess would be a weapon of some kind. This is close to around the time that Grand Tartary likely fell.
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It was a great inspiration for the final act of this story.