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Tunguska: The Russian Roswell | Russias Secret UFO Sightings | Full Documentary For the former USSR, the modern flying saucer era began in 1908, as villagers from a sparsely populated area of central Siberia, near the Tunguska River, witnessed a large glowing object streak across the sky and explode in mid-air with the force of a 40 megaton atomic blast, destroying hundreds of square miles of forest land. Includes film footage from ground zero and rare eyewitness accounts. Licensed from UFOTV®. All rights reserved #tunguskaufo #FreeFullMoviesOnYouTube #FreeFullSciFiMovies #ScienceFictionMovies