A strange hum has disturbed people worldwide, but the source of this sound is unknown - experts investigate the cause of this amazing sonic mystery, in this clip from Season 1, "Mystery Hum and Mayans on Mars."
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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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