53.85 kilometer
461 Contributions. The Seikan Tunnel is a 53.85 km (33.49 mile) railway tunnel in Japan, with a 23.3 km (14.5 mile) portion under the seabed. It is the longest undersea tunnel in the world, alth … ough the Channel Tunnel between England and France has a longer under-sea portion. For the deepest tunnel in the world in general go here -. Eiksund Tunnel-The deepest tunnel in the World. Seikan tunnel is nearly ' 53.85 kilometer long ' with a 23.3 kilometer section under the sea-bed which has been continuously welded. The track is 460 ft(140 meters) below the seabed and total depth from sea level to the tracks is 240 meters (790 ft) . Finally with all those brutal conditions, the Seikan tunnel was opened on 13 March 1988 and the cost of construction reached 3.6 billion Dollars. Seikan Tunnel holds the record for Deepest operational Railway Tunnel in the World and also as the longest Tunnel in the World. : Deepest Cave in the World (2kms Deep). The track level is about 100 metres (330 ft) below the seabed and 240 m (790 ft) below sea level. It travels beneath the Tsugaru Strait — connecting Aomori Prefecture on the main Japanese island of Honshu with the northern island of Hokkaido — as part of the Kaikyo Line of Hokkaido Railway Company (JR Hokkaido). The tunnel was opened on 13 March 1988, having cost a total of ¥ 538.4 billion (US$3.6 billion) to construct. Once the tunnel was completed, all railway transport between Honshu and Hokkaido used it. However, for passenger transport, 90% of people use air due to the speed and cost. The tunnel is 54 kilometres long, and descends to a depth of 240 metres below the surface of the sea. It took 17 years and ¥538,000,000,000 to build, and opened in 1998. It’s 135 metres below the surface. Perhaps the Seikan Tunnel doesn’t really belong in this section, as it's more a case of undersea than underground. It connects the Japanese mainland (Honshu) to the northern island of Hokkaido, and is the world's longest undersea tunnel. Today, the Seikan Tunnel is the longest railroad tunnel in the world at 33.4 miles in length, 14.3 miles of which lie under the Tsugaru Strait. Three stories high and 800 feet below the sea, the main tunnel was designed to serve the Shinkansen, Japan's high-speed bullet train.  The Seikan Tunnel is the deepest operational main-line rail tunnel in the world (though Line 3 of the Guangzhou Metro 's central tunnel has been longer since 2010) and the second longest after the Gotthard Base Tunnel in Switzerland. The tunnel was opened on 13 March 1988, having cost a total of ¥ 538.4 billion (US$3.6 billion) to construct. Once the tunnel was completed, all railway transport between Honshu and Hokkaido used it. However, for passenger transport, 90% of people use air due to the speed and cost. The Seikan Tunnel is a 53.85 km (33.49 mile) railway tunnel in Japan, with a 23.3 km (14.5 mile) portion under the seabed. It is the longest undersea tunnel in the world, alth … ough the Channel Tunnel between England and France has a longer under-sea portion. The Seikan Tunnel is 14.5 miles long, being one of the longest tunnels in the world. Making the world better, one answer at a time. The Seikan Tunnel is 14.5 miles long, being one of the longest tunnels in the world. It is the longest undersea tunnel in the world, alth … ough the Channel Tunnel between England and France has a longer under-sea portion.
http://www.answers.com/Q/How_long_is_the_Seikan_Tunnel http://www.factshunt.com/2013/05/seikan-tunnel-longest-tunnel-in-world.html https://en.wikipedia.org/wiki/Seikan_Tunnel http://www.unmissablejapan.com/underground/seikan-tunnel http://www.pbs.org/wgbh/buildingbig/wonder/structure/seikan.html https://en.wikipedia.org/wiki/Seikan_Tunnel http://www.answers.com/Q/Where_is_the_Seikan_Tunnel_located_and_how_long_is_it http://www.answers.com/Q/How_long_is_the_Seikan_Tunnel
how long is the seikan tunnel