Secrets Underground

5:00 PM to 6:00 PM

Friday 13 September

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 +1 at 5:00 PM, Friday 13 September. (Subtitles.)

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