Seikan tunnel is a 53.85 km railway tunnel with a 23.3 kilometer long portion under the seabed, and is the longest undersea tunnel in the world. Seikan Tunnel is an underwater railroad tunnel that connects between Honshu, the main island, and Hokkaido, the northern island. Seikan Tunnel The four main islands are all connected. When was it built; 3. Under the sea, there is an exhibition zone where visitors can learn how this magnificent 53.85 km tunnel built 240 m under the sea was completed. The Seikan Tunnel is the world’s longest underwater tunnel and connects Japan’s main island of Honshu with the island of Hokkaido. Hotels near Seikan Tunnel Museum: (0.45 km) Marufuku Ryokan (2.98 km) Pension Tsuru (12.66 km) Shiriuchi Onsen Ryokan (13.44 km) Onsen Ryokan Yano (14.29 km) Ryokan Yokohamaso; View all hotels near Seikan Tunnel Museum on Tripadvisor That is why in March of 2016, the Hokkaido Shinkansen, linking Aomori on Japan’s main island of Honshu with Hakodate on the island of Hokkaido via the Seikan Tunnel, was inaugurated. We introduce the world’s longest of Seikan Tunnel (240 m in sea floor, 53.85 km in total length) by sound, image and solid model. The history of this big project is shown in the way that is easy to understand. When you come out of the tunnel, you will be met by the expansive land that fosters magnificent nature and superb gourmet cuisine. Before the 26th of March 2015, the last stop of the Tohoku shinkansen was Shin-Aomori. Now the Hayabusa or Hayate Shinkansen go through the Seikan Tunnel ( 53,45 km) to cross the sea and stop at one or all of the new stations : Shin-Hakodate-Hokuto Station, Kikonai Station and … Until then, access to Hokkaido was challenging, but now with only one transfer, you can get there faster. It’s 135 metres below the surface. The tunnel started revenue service in 1988, and hosted some famous sleeper trains for almost 3 decades, including the Hokutosei, Cassiopeia, and Twilight Express. The tunnel, carrying a railway line, would replace the Seikan Ferry, then the only mass transportation between Hokkaido and the rest of Japan. South Portal is located on the Honshu side. You can go by the railway train which was actually used to the tunnel of 140 m below the sea level. This is one of only two undersea stations in the world. Perhaps the Seikan Tunnel doesn’t really belong in this section, as it's more a case of undersea than underground. 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