I was watching the History Channel and the subject was what caused a mega blast in 1908 in a placed called Tunguska in Siberia. They cited asteroids and comets as the culprit, even a troubled ufo theory. I waited for them to credit Nikola Tesla with carrying out his death ray experiments in the same place and coincidentally at the same time but it never came up. In later life when the press asked Tesla if he were responsible for the Tunguska explosion referring to his death ray experiments he would simply smile at the reporter and say nothing.
More on Tesla here:
http://www.gravitycontrol.org/Nikola-Tesla.html
