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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 ...
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Kanmon Straits, Japan: The first undersea tunnel in Japan, connecting the islands of Honshu and Kyushu. One of three tunnels underneath the Kanmon Straits: 3.604 km: 1936–1942 Lincoln Tunnel: New York, USA: Set of road tunnels built in three stages, crossing the Hudson River between Manhattan and New Jersey: 2.4 km average: 30 m: 1934–1957
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.
Susami (すさみ町, Susami-chō) is a town in Nishimuro District, Wakayama Prefecture, Japan. As of 31 October 2021 [update] , the town had an estimated population of 3,709 in 2041 households and a population density of 21 persons per km 2 . [ 1 ]
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.