1908 Mystery in Tunguska, Russia. Meteorite etc.
Published in Documentary Blog
George Carey uncovers the mystery behind the massive explosion that shook Tunguska, Siberia in 1908 which has been variously attributed to a meteorite and a crashed UFO.
Here's some blurb I found [amongst others] on the Channel 4 feedback page which I thought was an interesting summary of the documentary's approach.