Where To Stream Building Giants Season 4 Episode 3
Underground Mega Highway
- Aired May 20, 2020
- 60 Min
- Rated 9.0
- Number 19 Of 31 Rated Episodes
An expert team of engineers use hi-tech explosions and state-of-the-art drilling rigs to tear through solid granite and build an 11-mile underground tunnel, one of the longest in the world.