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The Seikan Tunnel, which connects Hokkaido and Honshu, is essential to the lives of Hokkaido residents. However, more than 35 years have passed since it opened, and its deterioration has come under scrutiny. This time, a camera went into the Seikan Tunnel on a route that is not usually seen. (Broadcast on November 1, 2024) #SeikanTunnel #Deterioration #HokkaidoShinkansen #Infiltration #CableCar #TsugaruStrait #EvacuationShelter #Fukushima #JRHokkaido #Hokkaido #STV