Sasson Tunnel



Sasson Tunnel (札樽トンネル) is a tunnel on JR's Hokkaido Shinkansen located between Otaru city and Sapporo Station in Hokkaido with total length of 26.230 km. It is under construction and was started excavation in 2020 in addition to existing JR railways in Hokkaido. Once completed, it will be the third longest tunnel on the Hokkaido Shinkansen line, after Seikan Tunnel and Oshima Tunnel. The Hokkaido Shinkansen line between Shin-Hakodate-Hokuto Station and Sapporo Station is scheduled to open in 2031.