Secrets of the Underground

Secrets of the Underground (2017)

Reality Documentary

A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.

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  • First Air Date: 2017-02-14
  • Last Air Date: 2017-12-16
  • Total Seasons: 2
  • Total Episodes: 16
  • Episode Runtime: 60 min.
  • Network: Science

Where to Watch Secrets of the Underground Online

You can now watch Secrets of the Underground online on the following streaming providers in the United States.


    • Seasons

    • Season 1

      8 Episodes

    • Season 2

      8 Episodes

    Trailer