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One of the last Japanese megaprojects of the 20th century, [12] the roadway was built at a cost of the ¥1.44 trillion (US$11.2 billion) and opened on December 18, 1997 [6] by then-Crown Prince Naruhito and then-Crown Princess Masako [13] after 23 years of planning and nine years of construction.
In Japan, the Kanmon Roadway Tunnel (関門国道トンネル, kanmon kokudō tonneru) carries National Route 2 under the Kanmon Straits. [1] At the time of its construction, it was the longest undersea highway in the world. [2] It opened in 1958. The overall length is 3,461 metres (11,355 ft) meters, and it is 58 metres (190 ft) below sea ...
the second-longest road tunnel in Japan (~10.7 km) Tokyo Bay Aqua-Line bridge-tunnel: 18 December 1997: Kawasaki, Kanagawa: Kisarazu, Chiba: the third-longest road tunnel in Japan Enasan Tunnel - Chūō Expressway: 1985: Nagano: Nakatsugawa City, Gifu: the fourth-longest road tunnel in Japan (~8.6 km) Ikuta Tunnel - Musashino Line: 1976: Ikuta ...
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).
The "Korea Japan Friendship Tunnel System" is a proposal for a fixed link from the city of Fukuoka on Kyūshū, Japan, to the port city of Busan in Korea via four islands. The maximum ocean depth in this area is 146 m (479 ft). Similar proposals have been discussed for decades by Korean and Japanese politicians.
The Seikan Tunnel (Japanese: 青函トンネル, Seikan Tonneru or 青函隧道, Seikan Zuidō) is a 53.85 km (33.46 mi) dual-gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) portion under the seabed of the Tsugaru Strait, which separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido.
An undersea volcano erupted off Japan three weeks ago, providing a rare view of the birth of a tiny new island, but experts say it may not last very long. The unnamed undersea volcano, located ...
The Bayshore Route (湾岸線, Wangan-sen) signed as Route B, is one of the routes of the tolled Shuto Expressway system in the Greater Tokyo Area.The Bayshore Route is a 62.1-kilometer (38.6 mi) stretch of toll highway that runs from the Kanazawa ward of Yokohama in the west, northeast to the city of Ichikawa in Chiba Prefecture in the east.