The conspiracy: Duck and cover, this one's explosive. Back in June 1908, a mysterious object detonated in the center of Russia, leveling over 800 miles of forest in what is now known as the Tunguska Event. The explosion was supposedly caused by a meteor, but not everyone bought that story, so conspiracy theories have cropped up to explain what really happened. Maybe it was aliens, or secret bomb testing, or time-traveling aliens, or a black hole, or anti-matter, or other science-y stuff. Heck, some people even think Nikola Tesla did it! Haha, how silly!
Assassin's Creed says… Nikola Tesla did it. With a giant death ray on top of Wardenclyffe Tower. Because fuck Thomas Edison. It seems that in 1908, the Templars got ahold of yet another Piece of Eden and took it to a research facility near the Podkamennaya Tunguska River. Assassins approached Tesla, who at that point had been financially ruined by Templars like Edison, and asked him to use his tower's wireless power transmission to destroy the facility. Destroy it he did, but not before getting in one last dig.