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Exotic versions of the Tunguska meteorite: antimatter, nuclear explosion, collision with Earth of a miniature black hole, crash of an alien spacecraft (proposed by the famous Soviet science fiction writer A. Kazantsev), Nikola Tesla's experiments on resonant excitation of the ionosphere through the Wardenclyffe Tower (it could transmit a huge amount of energy, and the meteorite was never found), and so on.
I watched this program myself. I just don't remember the details anymore.
O God of Earth and Altar, Bow down and hear our cry, Our earthly rulers falter, Our people drift and die, The walls of gold entomb us, The swords of scorn divide, Take not thy thunder from us, Take away our pride.