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The Boknafjord tunnel (main part of the Rogfast project) is under construction and will in 2033 be the world's longest and deepest undersea tunnel, 26.7 kilometres (88,000 ft) long and reach 392 metres (1,286 ft) under sea level.
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 ]
According to a United Press report at the time, 53 workers were killed during its construction, and it was second only to the Mersey Railway tunnel in length for an underwater tunnel. [3] Work on the Kanmon Roadway Tunnel began in 1937, but was halted in 1939 by World War II. Work resumed in 1952, and the tunnel was officially opened on March 9 ...
At its lowest point, it is 75 m (246 ft) below the sea bed and 115 m (377 ft) below sea level. [5] [6] [7] At 37.9 km (23.5 miles), it has the longest underwater section of any tunnel in the world and is the third-longest railway tunnel in the world. The speed limit for trains through the tunnel is 160 km/h (99 mph). [8]
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).
While the sub-sea tunnel deepest point is 165 meters (541 ft) below sea level, the deepest sea depth is 40 meters (130 ft), and the minimum rock coverage is 40 meters (130 ft). The tunnel is a single bore with 2 lanes, except on the northern end of the tunnel where there are 3 lanes: 2 lanes on the uphill section and 1 lane downhill.
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A tunnel under a fjord, the Hvalfjörður Tunnel, is among the longest underwater road tunnels in the world, and goes as deep as 165 m (541 ft) below sea level. [1] Tunneling is a relatively recent trend in Icelandic road infrastructure. It started off slowly and was at first only used in extreme circumstances, such as under Arnardalshamar in 1948.