23 עונה
705 פרק
Modern Marvels - Season 17 Episode 7 פרק 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.
- שָׁנָה: 2022
- מדינה: United States of America
- ז'ָאנר: Documentary
- סטוּדִיוֹ: History, H2
- מילת מפתח: technology, invention, disaster, construction, machine
- מְנַהֵל: Bruce Nash
- ללהק: