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Watch History's Greatest Mysteries Season 3 Episode 3 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

An infamous Cold War cold case: nine hikers found mutilated on a remote mountain slope. For over 60 years, authorities and amateurs alike have been trying to figure out what happened, in a place that's been called "Russia's Area 51."