Secrets Of The Underground - Mystery Of The Serpent Mound

(2017)

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Synopsis

In a major city riddled with underground passageways, could some of these tunnels lead to the underground headquarters of a secret organization planning to overthrow the government? Or are these just wild assertions from far-out conspiracy theorists? We deploy advanced sonic technology to investigate under Denver's airport, state capitol building, and downtown financial district. And in Ohio, mystery shrouds an ancient mound, stretching almost a quarter-mile long, shaped like a serpent. Was this serpent mound simply a shrine for religious rituals, as some believe? Or is does it conceal something far more disturbing below the surface like the victims of some ritualistic sacrifice?

Cast