The Seikan tunnel is the longest railway undersea tunnel in Japan, which is 53.85 km long between both openings and having its 23.3 km long portion below the seabed. The track laid down in the Seikan tunnel is 240m below the sea level; on the other hand the track is 140m below the seabed.This
discussion allows us to know all about an undersea tunnel specially the SEIKAN
TUNNEL, advantages and disadvantages of the tunnels over bridges. To know more
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