First read this news item, made available to the public courtesy of the BBC. Note the final paragraph at the bottom of the page:
Such meteor strikes are rare in Russia but one is thought to have devastated an area of more than 2,000 sq km (770 sq m) in Siberia in 1908.
And now check out this set of pages, detailing an intriguing set of theories, rather well researched – which also interestingly correlate with a particular battle mentioned in the Baghavad gita.
It may seem like a lot to read, but within the pages are detailed descriptions of nuclear/hydrogen-type bomb blasts, years and centuries before the first atom bomb was invented.
By the way, I only found this information courtesy of my friend, Tina Deschamps, a cleverer lady I do not know. And if she is prepared to give even a vague level of credence to this information, then so am I.