Episode 075 - In the summer of 1908 a huge explosion levelled over 2000 square kilometres in Siberia. The event happened near the remote Tunguska river. It created the loudest sound ever heard by human ears and was visible through Europe and Asia. Locals reported seeing a large fireball rumbling across the sky before the blast. To this day, almost 111 years later, the exact cause of Tunguska Event remains a mystery.NOTE: Scott is back as co-host!Sources:Russian Site on the Event - photos, investigation and first hand accounts100 Wonders: The Tunguska Event - Atlas Obscura - VideoNASA article on TunguskaThe Tunguska Event at WikipediaNuclear Secrecy - NukemapLeonid KulikNoctilucent CloudsCornell article on Mirror MatterSupport the show.