Modern Marvels (1993 – ...)

1993 • 23 seasons • Documentary • TV-PG

On August 8, 2026

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Episode 7 — Secret Underground

Name: Episode 7 — Secret Underground
Released: 2010-12-10
Duration: 44 min

Season 17 • Modern Marvels

Released: 2010-12-10 • Documentary

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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.

Episodes

Episode 1
Mega Stores
2010-10-29

Episode 2
Supersized Food
2010-11-05

Episode 3
Coin Operated II
2010-11-12

Episode 4
Engineering Disasters 22
2010-11-19

Episode 5
Dogs
2010-11-26

Episode 6
Built to Last
2010-12-03

Episode 7
Secret Underground
2010-12-10

Episode 8
Made in the USA
2010-12-17

Episode 9
Driver's Seat
2010-12-21

Episode 10
Rice
2010-12-29

Episode 11
Packaging
2011-01-14

Episode 12
Grease
2011-01-21

Episode 13
Ropes & Chains
2011-01-28

Episode 14
American Trucking
2011-02-04

Information

Episode air date	10.12.2010
Episode runtime	44 min
Episode rating	0.00
Genres	Documentary
TMDB series rating	8.1
IMDb series rating	8.1
Series status	Returning series
Age rating	6+
Country	US

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