Seikan Tunnel

The Seikan Tunnel from Aomori to Hokkaido: the World’s Longest Undersea Tunnel

The Seikan Tunnel, which travels beneath the Tsugaru Strait, is the world’s longest undersea tunnel in the world. It serves as a connection between Aomori Prefecture on the island of Honshu and the northern island of Hokkaido. It was built in the 20th century with a length extending to 53.85 km. The tunnel can be…