Secret Underground
Modern Marvels · Season 17 · Episode 7
Just below the surface, there's a whole different America hidden from public view. Take a revealing look at the America under our feet, from secret military installations, and experimental farms to tunnel networks and neutron lasers.
Episode Details
Air date, runtime, timezone, and episode position.
Season
17
Episode
7
Air Date
10/Dec/2010
Air Time
21:00
Runtime
44 min
Overview
Episode summary.
Just below the surface, there's a whole different America hidden from public view. Take a revealing look at the America under our feet, from secret military installations, and experimental farms to tunnel networks and neutron lasers.
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