Undersea tunnel

An underwater tunnel is a tunnel under a river or a strait and can be built as a (more expensive ) alternative to a bridge. The construction of underwater tunnels is often placed at the crossing of waterways, which are navigated by large ships as underwater tunnels pose no limitation of headroom for shipping. In particular, for railways provide underwater tunnel in shallow topography of a suitable alternative to a high bridge, since it will allow a gradient poor routing.

Underwater tunnel in Germany

• Old Elbe Tunnel ( road traffic, including pedestrians)
• New Elbe Tunnel ( road, highway)
• Ems ( road, highway)
• Herrentunnel
• Channel Tunnel Rendsburg ( road, four-lane federal highway )
• Warnowtunnel
• Wesertunnel
• Tunnel of the subway Frankfurt am Main and the S- Bahn Rhein -Main under the Main
• Several tunnels of the Munich subway (U1 / 2 and U4/U5 ) and S -Bahn ( main line [ Rosenheimerplatz ↔ Isartor ] ) under the Isar

Underwater tunnel in the world

• Seikan Tunnel
• Euro tunnel under the English Channel
• Rail tunnel under the Great Belt
• Holland Tunnel and Lincoln Tunnel under the Hudson River in New York City
• Eiksundtunnel, Norway, 287 meters below sea level, the deepest road tunnel in the world
• Hirsch grave tunnel of the S -Bahn Zurich, passes under the river Sihl and Limmat
• Ellingsøytunnel (Norway )
• Godøytunnel (Norway )
• Valderøytunnel (Norway )
• North Cape tunnel (Norway )