🚄 Seikan Tunnel Museum (青函トンネル記念館) – Aomori
Explore One of the World's Longest Undersea Tunnels
The Seikan Tunnel Museum, located in Tappi Misaki (Cape Tappi) in Aomori Prefecture, offers a fascinating look into the history, construction, and technology behind the Seikan Tunnel (青函トンネル) — the world’s longest undersea railway tunnel until 2016, connecting Honshu (Aomori) and Hokkaido beneath the Tsugaru Strait.
🌊 About the Seikan Tunnel
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Total length: 53.85 km (33.4 miles)
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Undersea section: 23.3 km (14.5 miles)
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Completed in 1988 after more than 17 years of construction
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An engineering marvel built to withstand strong currents, earthquakes, and harsh weather
🏛️ What to See at the Museum
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Detailed exhibits on tunnel construction, geology, and engineering challenges
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Scale models, videos, and photos of the massive project
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Historical machinery used in excavation
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Displays that honor the workers and victims involved in the construction
🚇 Experience the Underground World
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In summer (typically April to November), visitors can ride the Seikan Tunnel Experience Train down to the actual underground work station used during construction, known as the “Kaikyo Line Shiryōkan” (海峡線資料館)
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Travel 140 meters below sea level, walk along a former work site, and feel the power of this feat of engineering
🌅 Scenic Location
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The museum is located near Cape Tappi, known for its dramatic coastal cliffs and panoramic views of the Tsugaru Strait
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You can also visit the Tappi Wind Park and nearby hiking trails for beautiful ocean scenery
🎯 Why Visit?
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🚄 Learn about one of the greatest infrastructure projects in Japan
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🌊 Stand above and go near the legendary tunnel beneath the sea
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👷 Appreciate the human effort and innovation behind connecting two islands
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📸 Enjoy a combination of technology and natural beauty at Cape Tappi
🧭 Access
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From Aomori City, take a train to Minmaya Station, then a short taxi or bus to the museum
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The tunnel access tour is seasonal and may require reservations
Whether you're interested in railways, engineering, or Japanese history, the Seikan Tunnel Museum offers a rare and unforgettable look into one of Japan’s boldest achievements beneath the sea.
Official Website
http://seikan-tunnel-museum.jp/en/
Accommodation sites
Agoda