Secret Underground

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.

Writing:
  • Bruce Nash

Stars:
Release Date: 1993-12-10
Seasons: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
TMDb: 7.9/10
  • Country: US
  • Language: English
  • Runtime: 44

Other episodes for this season

Mega Stores
Episode 1 - Mega Stores
Supersized Food
Episode 2 - Supersized Food
Coin Operated II
Episode 3 - Coin Operated II
Engineering Disasters 22
Episode 4 - Engineering Disasters 22
Dogs
Episode 5 - Dogs
Built to Last
Episode 6 - Built to Last
Secret Underground
Episode 7 - Secret Underground
Made in the USA
Episode 8 - Made in the USA
Driver's Seat
Episode 9 - Driver's Seat
Rice
Episode 10 - Rice
Packaging
Episode 11 - Packaging
Grease
Episode 12 - Grease
Ropes & Chains
Episode 13 - Ropes & Chains
American Trucking
Episode 14 - American Trucking