Harvard researchers propose the mind-bending idea that a technologically advanced civilisation might be hidden on Earth, possibly in unexplored ocean depths or remote regions. If proven, this hypothesis could revolutionize our understanding of history and technology. Are we sharing our planet with unknown neighbours?

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https://futurism.com/harvard-scientists-unknown-civilization-cryptoterrestrials?utm_source=flipboard&utm_content=HariTulsidas%2Fmagazine%2FMind+and+Matter