Secrets Underground

1:00 AM to 2:00 AM

Tuesday 3 February

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 Channel HD at 1:00 AM, Tuesday 3 February. (Subtitles.)

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