Super Tunnel
- Episode aired May 28, 2018
- TV-PG
- 42m
Building Giants follows the epic plan to build 19 miles of new train tunnels underneath Copenhagen - the largest engineering feat in the Danish capital for over 400 years.Building Giants follows the epic plan to build 19 miles of new train tunnels underneath Copenhagen - the largest engineering feat in the Danish capital for over 400 years.Building Giants follows the epic plan to build 19 miles of new train tunnels underneath Copenhagen - the largest engineering feat in the Danish capital for over 400 years.