On June 17, 1908, one of the most grandiose and mysterious disasters in human history occurred in the Siberian taiga - a monstrous explosion, according to the official version, caused by the fall of the Tunguska meteorite. However, there is still debate about what it really was - a natural phenomenon? Alien ship crash? or the work of human hands? This book convincingly substantiates the latter version. Having studied all the circumstances of the tragedy, analyzing all scientific hypotheses and eyewitness accounts, the author comes to the conclusion that the cause of the Tunguska disaster was the risky experiment of the great scientist and inventor Nikola Tesla.