The Tunguska Event — The Largest Impact in Recorded History (1908)

On the morning of June 30, 1908, a massive explosion occurred near the Podkamennaya Tunguska River in the remote Siberian taiga, flattening an estimated 80 million trees over an area of 830 square miles — roughly the size of a major metropolitan area. The blast, estimated at 10 to 15 megatons of TNT (approximately 1,000 times the power of the Hiroshima bomb), was detected by seismic stations across Europe and produced atmospheric pressure waves recorded as far away as England. Night skies across Europe and Asia glowed for several days afterward, bright enough to read by in London. Despite the enormous scale of the devastation, no impact crater was ever found. The remoteness of the location meant that the first scientific expedition to the site, led by Leonid Kulik, did not arrive until 1927 — nearly twenty years after the event. Kulik found a forest of trees stripped bare and knocked flat in a radial pattern, but at ground zero, some trees remained standing upright, stripped of branches. The leading scientific consensus holds that the event was caused by the airburst of a stony asteroid or comet fragment approximately 160 to 620 feet in diameter, which exploded 3 to 6 miles above the Earth's surface, generating a superheated shockwave that devastated the forest below without creating a traditional impact crater.