00:00Sightings of a mysterious creature in Scotland's Loch Ness have been reported for centuries.
00:06From blurry photos to sonar readings, the evidence teases but never proves.
00:11Is Nessie a prehistoric creature, just a trick of the light, or perhaps the world's best
00:17kept secret?
00:18From vanished colonies to signals from the stars, these mysteries remind us how little
00:23we truly understand about our world and beyond.
00:27What do you think is hiding in the shadows?
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