Japan’s Seikan Tunnel: The World’s Longest Undersea Tunnel Japan’s Seikan Tunnel is the longest undersea tunnel in the world, stretching over 53 kilometers, with 23 kilometers running beneath the ocean floor. Built to withstand earthquakes and harsh seabed conditions, it connects Honshu and Hokkaido. Completed in 1988, the tunnel stands as a triumph of civil engineering, safety planning, and geological mastery—especially in one of the world’s most seismically active regions. Important Details: •

Underwater Railway Tunnel sa JAPAN “THE SEIKAN TUNNEL” #fyp #japan #seikantunnel #fblifestyle | 𝐒𝐄𝐍𝐏𝐀𝐈 𝐕𝐎𝐍

Seikan Tunnel Bullet Train (1988) #reels #fbreels #india #japan #bullettrain #japantrain #newpost #TsugaruStraitTunnel #BulletTrain #SeikanTunnel #JapanTravel #RailwayHistory #TrainEnthusiast #RidingTheTunney #1988Japan #EngineeringMarvel #CrossingTheStrait #TsugaruStrait #JapanRailways #TrainSpotting #HistoricalTransportation #TransitAdventure #TravelJapan #RailwayInfrastructure #TunnelConstruction | The Informed Citizen

Japan, you are amazing! The Seikan Tunnel, which connects Honshu and Hokkaido, is the longest undersea railway tunnel in the world. Spanning 53.8 km—23.3 km of which runs beneath the Tsugaru Strait—it was completed in 1988 and now serves as a key part of the Hokkaido Shinkansen. | Wander in Japan