The Seikan Tunnel is a 53.85 kilometre railway tunnel in Japan. It has a 23.3 kilometre long portion under the seabed. Track level is about 140 metres below seabed and 240 metres below sea level. It connects Aomori Prefecture on the Japanese island of Honshu and the island of Hokkaido as part of the Kaikyo Line of Hokkaido Railway Company. Seikan is both the longest and the deepest operational rail tunnel in the world. It is also the longest undersea tunnel in the world.
Image of Seikan Tunnel
Image of Seikan Tunnel
Image of Seikan Tunnel
Image of Seikan Tunnel
Image of Seikan Tunnel
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