Season 17, Episode 7 Secret Underground

First Aired: December 10, 2010

Secret underground places are explored, including military installations; and scientific facilities.

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  • Premiered: December 10, 1993
  • Rating: TV-PG
  • User Rating:4.62 out of 5 (68 ratings)
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  • Premise: Chronicling man's achievements in the fields of science, technology, electronics, mechanics, engineering, architecture, industry, mass production manufacturing and agriculture, the episodes of Modern Marvels details the development of certain landmark prod… (more)

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