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An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry links. [ 1 ]
The Centennial Bridge is the second major road crossing of the Panama Canal, the first being the Bridge of the Americas. (Small service bridges are built in the lock structures at Miraflores and Gatún Locks, but these bridges are only usable when the lock gates are closed and have limited capacity.)
The Port of Miami Tunnel (also State Road 887) is a 4,200-foot (1,300 m) [3] bored, undersea tunnel in Miami, Florida.It consists of two parallel tunnels (one in each direction) that travel beneath Biscayne Bay, connecting the MacArthur Causeway on Watson Island with PortMiami on Dodge Island.
The canal transports ships through the Gatun Lake, some 26 meters (85 ft) above sea level, via a series of interconnecting locks. Each ship's transit requires some 200 million liters (53 million ...
Submerged floating tunnels can be anchored to the seafloor (left) or suspended from a pontoon (right) A submerged floating tunnel (SFT), also known as submerged floating tube bridge (SFTB), suspended tunnel, or Archimedes bridge, is a proposed design for a tunnel that floats in water, supported by its buoyancy (specifically, by employing the hydrostatic thrust, or Archimedes' principle).
It is part of the "Northern Marmara Motorway", which will be further integrated with the existing Black Sea Coastal Highway, and will allow transit traffic to bypass city traffic. The Marmaray project, featuring a 13.7 km (8.5 mi) long undersea railway tunnel , opened on 29 October 2013. [ 34 ]
The Autovía A-6 or Autopista AP-6 (also called Autovía del Noroeste) (Galician: Autovía do Noroeste) is a Spanish autovía and autopista route that starts in Madrid and ends in Arteixo (A Coruña). The tolled Autopista AP-6, from Villalba to Adanero, has a total length of 72.19 km.
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