TunnelDB
106 guides on famous tunnels worldwide. From the Gotthard Base Tunnel and the Channel Tunnel to the Laerdal road tunnel, New York water aqueducts and canal heritage bores, explore the great underground passages of rail, road, water and mining.
Key Tunnels
Gotthard Base Tunnel
The longest railway tunnel in the world, twin bores driven 2,300 m beneath the Gotthard massif. Built over 17 years as the centerp...
Seikan Tunnel
Links Honshu and Hokkaido beneath the Tsugaru Strait, with 23.3 km under the seabed and 240 m of rock cover at its deepest. Planne...
Channel Tunnel
Three parallel bores, two rail and one service, driven through chalk marl between Folkestone and Coquelles, with 37.9 km under the...
Laerdal Tunnel
The longest road tunnel in the world, carrying the E16 between Laerdal and Aurland on the Oslo to Bergen route. Three illuminated ...
Mont Blanc Tunnel
Links Chamonix and Courmayeur between France and Italy under the highest Alpine massif. The March 1999 truck fire killed 39 people...
Delaware Aqueduct
Longest tunnel in the world, carrying New York City water from Rondout and Delaware reservoirs by gravity. A chronic leak under th...
Eisenhower-Johnson Memorial Tunnel
I-70 bores under the Continental Divide at 3,401 m in Colorado, the highest vehicle tunnels in the US interstate system. The Eisen...
Eysturoy Tunnel
Subsea link between Streymoy and Eysturoy featuring the first undersea traffic roundabout in the world, a 200 m ring beneath Skala...
Mponeng Mine
Deepest mine in the world, a gold operation west of Johannesburg reaching more than 4 km below surface. Rock temperatures near 60 ...