Interesting fact
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.
More about Seikan Tunnel Tappi Diagonal Line
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.