6 Sezon
41 Episod
Mega Builders - Season 6 Episode 1 Episodul 1 (2012)
Return to the 57-kilometer long high-speed rail tunnel in Switzerland's Gotthard Mountain range to see what it will take to finish the project by 2017.
- Țară : Canada, Germany, United States of America
- Gen : Documentary
- Studio : Discovery
- Director :
- Distribuție :
