Secrets Underground

7:00 PM to 8:00 PM
Sunday 8 December
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Rocky Mountain Monsters

Season 1 Episode 5 of 8

Rob Nelson examines bizarre markings that suggest a violent clash between prehistoric beasts, and in California, he investigates whether a strange lake might be home to alien life

Secrets Underground airs on Discovery History at 7:00 PM, Sunday 8 December. (Subtitles.)
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