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S1, E4: An examination of underground bunkers, from their use in ancient wartime planning to the hidden survival complexes found beneath modern American cities.
Documentary · Mar 30, 2014 · 43 min
Information
- Released
- 2014
- Run Time
- 43 min
- Rated
- 0+
- Region of Origin
- United States
- © 2014 Discovery Communications Inc.
Languages
- Original Audio
- English
- Audio
- Japanese (Japan) (AAC)