"Tunguska UFO crash"@en . . "The Tunguska Event was a large explosion that occurred in the atmosphere over the Tungus region of Siberia. Although the object responsible burst in the air rather than hitting the surface, this event is still referred to as an impact. Estimates of the energy of the blast range from 5 to as high as 30 megatons of TNT"@en . . "The Tunguska Event was a large explosion that occurred in the atmosphere over the Tungus region of Siberia. Although the object responsible burst in the air rather than hitting the surface, this event is still referred to as an impact. Estimates of the energy of the blast range from 5 to as high as 30 megatons of TNT"@en .