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Seikan Tunnel – Japan - Atlas Obscura
Seikan Tunnel Museum(Seikan Tunnel Museum)|Search Destinations in Tohoku
Seikan tunnel - The Longest Underwater Rail Tunnel
The Seikan Tunnel —【Japanology Plus】
File:Seikan Tunnel Museum (青函トンネル記念館) - panoramio.jpg - Wikimedia Commons
Japan Atlas: Seikan Submarine Tunnel
Going Down, Down, Down
The world's longest underwater tunnel that's an insane 33 miles long and cost £5.6b, World, News
Water, Free Full-Text