Mysteries of Krasnoyarsk Krai

The Tunguska Incident: Siberia's Unexplained Megablast

On June 30, 1908, an explosion 1,000 times more powerful than the Hiroshima bomb detonated over remote Siberia, flattening 80 million trees across 830 square miles. No crater. No debris. After 117 years, the cause remains hotly debated.