The fireball that rose over a conifer forest in the remote Stony Tunguska River basin in central Siberia on the morning of June 30, 1908, reached an altitude of twelve miles, and the blast was heard hundreds of miles away. Those closest to the explosion, the townspeople of Vanavara, 40 miles away, felt a wave of intense heat; windows cracked, objects fell from walls, and one man sitting on his porch was thrown several yards and knocked unconscious. Trees were flattened and scorched over an area of several hundred square miles, their felled trunks all pointing away from the epicenter.
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