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aatventure
The Khara-Hora shaft in Russia is one of the most mysterious rock formations ever found, and has become something of an internet mystery.
Depending on who you ask, it could have been built by an unknown ancient civilization (who may still be at the bottom of it), or it could be a secret superweapon from World War II.
Or… It might just be a weird natural formation. We look at all the theories in today’s video.