Tappi-Kaitei Station, Underground railway station in Sotogahama, Japan
Tappi-Kaitei Station sits 240 meters below sea level inside the Seikan Tunnel, which runs beneath the Tsugaru Strait connecting Honshu and Hokkaido. Two side platforms faced each other across the tracks, with an underground cable car system lifting people up to ground level.
The station opened on March 13, 1988, when the Seikan Tunnel began service as a major transport link between the islands. It was designed primarily as a safety refuge for train passengers who needed to escape in case of emergency.
The museum inside shares how engineers tackled the challenge of building beneath the ocean. Visitors can see the methods and problems that workers solved to connect the two islands below the water.
To reach the station today, visitors take the underground cable car from the surface, a slow but manageable descent. Since trains no longer run here, access is reserved only for those wishing to tour the facility and museum.
When it operated, this was one of the world's deepest underwater stations, a rare engineering achievement now frozen in time. Visitors today can explore this hidden place and experience the quietness of being far beneath the ocean surface.
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