Seikan Tunnel Tappi Diagonal Line
The Seikan Tunnel Tappi Diagonal Line in Japan connects the islands of Honshu and Hokkaido beneath the Tsugaru Strait. It is a railway tunnel measuring 53.85 kilometers, making it the second longest tunnel in the world. Opened in 1988, it facilitates both passenger and freight transport.
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The tunnel reaches a maximum depth of 240 meters below the seabed, making it one of the deepest in the world. Construction began in 1971 and took 17 years to complete. It is a critical infrastructure for Japan's railway system, used by both conventional trains and the Shinkansen. Visitors can access the Tappi Kaitei Station, which offers insights into the tunnel's construction and operation.