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Wednesday, March 24, 2010

Fw: World's Longest Under sea Tunnel - Seikan tunnel. [7 Attachments]

From: FARDEEN <>
Subject: World's Longest Under sea Tunnel - Seikan tunnel. [7 Attachments]
Date: Tuesday, March 23, 2010, 6:14 PM

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The Seikan Tunnel is a 53.85 km (33.46 mi) railway tunnel in Japan, with a 23.3-kilometre (14.5 mi) long portion under the seabed. Track level is about 140-metre (460 ft) below seabed and 240-metre (790 ft) bve years later, construction began. By August 1982, less than 700 metres of the tunnel remained to be excavated. First contact between the two sides was in 1983.
The Tsugaru Strait has eastern and western necks, both approximately 20 kilometres across. Initial surveys undertaken in 1946 indicated that the eastern neelow sea level. It is the longest undersea tunnel in the world, although the Channel Tunnel between the United Kingdom and France has a longer under-sea portion. It travels beneath the Tsugaru Strait—connecting Aomori Prefecture on the Japanese island of Honsh? and the island of Hokkaid?—as part of the Kaikyo Line of Hokkaido Railway Company. Although it is the longest traffic (railway or road) tunnel in the world, faster and cheaper air travel has left the Seikan Tunnel comparatively underused. Its claim to the record for the longest tunnel will be taken when the Gotthard Base Tunnel, a European railway tunnel, is completed in around 2018. It is also the deepest rail tunnel in the world.


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