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Extreme Engineering - Season 3 Episode 5
The Gotthard Base Tunnel underneath the Swiss Alps will be the world's longest rail tunnel upon completion in 2015.
- Umwaka: 2011
- Igihugu: United States of America
- Ubwoko: Documentary
- Sitidiyo: Discovery
- Ijambo ryibanze: engineering
- Umuyobozi:
- Abakinnyi: