Close Encounters in Siberia.
Discussion
jimpritchard said:
Read the Arthur C Clarke book about this years ago, I imagine the destruction if it HAD hit a town would have been on par with Hiroshima / Nagasaki..
According to Wiki (yes I know, but this one has good references) estimates of the blast are around 10-15 megatons, which makes it roughly 1000 times as powerful as the Hiroshima bomb. The blast caused damage over 830 sq. miles 
http://en.wikipedia.org/wiki/Tunguska_blast
Sorry.. the memory's playing tricks, it MAY have been the 80's tv series...
http://www.imdb.com/title/tt0247885/
http://www.imdb.com/title/tt0247885/
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