Hitachi developed a quartz glass chip able to preserve data for millions of years - theorists believe extraterrestrials used this technology to store hidden encoded messages in crystal skulls, in this clip from Season 6, Episode 2, "The Crystal Skulls."

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From mysterious and supernatural occurrences, to extraordinary stories and investigations of the unknown, The UnXplained Zone is your portal to the paranormal. Follow the evidence, uncover the cover-ups, and discover what lies behind mankind's greatest mysteries and the world's strangest phenomenons.

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