Did an alien spacecraft crash-land in Russia?

In 1908, in the remote forests of Siberia, there was a giant explosion and bright lights were seen in the sky. Was this an asteroid or a comet crashing to earth? Or could it have been an alien spacecraft – or even a human experiment gone horribly wrong? In this episode of History’s Greatest Conspiracy Theories, environmental historian Andy Bruno joins Rob Attar to explore the debates that still surround the mysterious Tunguska event.

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