This is a movie length film so give yourself time to watch this great movie 

Accept no imitations! Go to Tunguska Ground Zero in this Amazing Fact Filled Documentary. Villagers from central Siberia, near the Tunguska River, witnessed a large glowing object streak across the sky and explode in midair with the force of an atomic blast equal to over 40 megatons, completely destroying miles of forest. Light from the blast was witnessed from thousands of miles away. Hear from one of the last living eyewitnesses of this event as well as the experts and former KGB officers who describes a cover-up surrounding this event, and how metallic evidence of an alien spacecraft gathered by the soviet military from the site was discovered and then disappeared in secrecy. Includes shocking film footage and spellbinding interviews with researchers and the best known, most credible Tunguska authorities in the world today.