Seikan Tunnel Pilot Shaft Breakthrough, World’s Longest Subaqueous Tunnel January 27, 1983

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, the world's longest sub-aqueous tunnel (53.85 km) between the Japanese islands of Honshū and Hokkaidō, breaks through.

Date: January 27, 1983

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