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    Secrets of the Underground
    Secrets of the Underground
    Reality
    Documentary

    Secrets of the Underground

    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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    Created By

    Status

    Returning Series

    Original Name

    Secrets of the Underground

    First Air Date

    February 14, 2017

    Last Air Date

    December 16, 2017

    Seasons

    2

    Episodes

    16

    Language

    English

    Production Companies

    Science Channel

    Networks

    Science

    S02E08

    Quest for the Gold Rush Fortune

    Millions of dollars of stolen Gold Rush treasure is rumored to have been stashed in a cave in Northern California. Rob Nelson and Stefan Burns use cutting-edge technology to search for the legendary treasure.

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