Alien spaceship hit comet to save earth over Tunguska in Siberia

In 1908 an explosion occurred in Tunguska, Siberia flattening trees and scorching hundreds of square miles. The energy from the explosion was felt around the globe and estimated to be 1,000 times as powerful as the bomb dropped on Hiroshima, Japan and about one-third the power of the Tsar Bomba, the largest nuclear weapon ever detonated. Now in latest development according to Channel 4 program Close Encounters In Siberia."Alien spaceship hit comet to save earth over Tunguska in Siberia"