Despite being the longest train tunnel in the world, alternatives like the Seikan Tunnel in Japan's Tsugaru Strait and the Channel Tunnel connecting the UK and France offer quicker routes.
A separate system grouts the pieces together. With its official opening, the GBT has surpassed Japan's 53.9-kilometre Seikan tunnel as the world's longest train tunnel. The 50.5-kilometre Channel ...
The Hokkaido Shinkansen, which provides a direct rail link between Tokyo and the northernmost of Japan's four main islands via the undersea Seikan Tunnel, opened on March 26, 2016.