1983day.year
The pilot shaft of the Seikan Tunnel, the world's longest sub-aqueous tunnel (53.85 km) between the Japanese islands of Honshū and Hokkaidō, breaks through.
The pilot shaft of the Seikan Tunnel, connecting Honshū and Hokkaidō, broke through in 1983, creating the world's longest undersea rail tunnel.
On January 27, 1983, engineers completed the pilot shaft breakthrough of the Seikan Tunnel in Japan. The 53.85 km tunnel connects the main island of Honshū with Hokkaidō beneath the Tsugaru Strait. Construction began in 1971 and faced challenges like high water pressure and complex geology. The breakthrough marked a major engineering milestone in subaqueous tunneling. It paved the way for the tunnel's final completion in 1988. Today, the Seikan Tunnel is a critical link in Japan's railway network, used by both freight and passenger trains. It remains one of the longest and deepest operational tunnels in the world.
1983
Seikan Tunnel
Honshū
Hokkaidō