Secrets Underground

6:00 AM to 7:00 AM
Saturday 21 December
+

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 Science +1 at 6:00 AM, Saturday 21 December. (Subtitles.)
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