Spanning over 33 miles and descending nearly 800 feet below sea level, the Seikan Tunnel stands as one of the greatest civil engineering achievements in modern history. Built across decades through the turbulent depths of the Tsugaru Strait, it seamlessly links Honshu and Hokkaido, carrying high-speed Shinkansen bullet trains straight beneath the seabed. Traveling through this vast subterranean passage offers passengers a thrilling transit experience through a true wonder of modern infrastructure. For railway enthusiasts and curious travelers alike, traversing between Japan's islands beneath the ocean floor remains an unforgettable journey.
- Tunnels
- Engineering
- Trains
- Infrastructure
- Subterranean Sites
- Transportation
Swipe more in Aomori
tryJP is a swipe deck for Japan places — save spots you like and plan a route.
Open tryJP