Seikan, the world's longest railway tunnel

Seikan is the world's longest railway tunnel: The Seikan Tunnel, which connects two islands in Japan, is recorded as the longest railway tunnel in the world.
Seikan Tunnel, which is one of the structures where Japanese engineering and creativity has been exhibited at the highest level, is the railway tunnel that connects Hokkaido Honshu Islands in Japan with a total length of 53.8 kilometers. It is called the Tsugaru Strait.
Seikan Tunnel deserves its title as the world's second largest underwater tunnel after the Channel Tunnel. 23,3 kilometers of the Seikan tunnel are under the sea. The deepest part of the tunnel is located 240 meters below sea level. The place where it is close to the bottom of the sea in the sea is around 100 meters. While the inner height of the tunnel is 7,85 meters, the inner width is around 9,7 meters.
The Seikan Tunnel 1954 is a horrific disaster, which caused the 5 passenger ship to collapse and the 1430 passenger ship, including Toya Maru, after a severe typhoon on the Japanese coast. Bufacia has led to the idea of ​​linking Hokkaido and Honshu islands under the sea.
The project of the tunnel construction was carried out during 9 year and the construction was started in 1964. When the construction of the tunnel in many years was completed in 1988 538.4 billion as the cost of the 3.6 billion as it cost with the figures of that period has found XNUMX billion dollars.
The official opening of the Seikan Tunnel was made on March 13, 1988. The tunnel, which was designed with soft curves and inclinations to be suitable for the use of trains, was built as a double line suitable for round trip use. When it was first opened, normal high-speed trains were used, and then high-speed train Shinkansen trains, called lead bullets, were used. There are 2 stations in the train and these stations are currently used as restaurants.
Although the Seikan Tunnel is the longest tunnel in the world, it is expected that the tunnel will soon be dumped by another tunnel. The 2017 railway tunnel, which is planned to be completed in 27 and will pass through the Alps, is expected to sign a new record.