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[What day is it today? | Tohoku Edition] What day is March 10th?
The day the main tunnel of the Seikan Tunnel was completed
On March 10, 1985 , the main tunnel of the Seikan Tunnel was completed , connecting Honshu and Hokkaido by land.

The Seikan Tunnel (also known as the Seikan Tunnel) is a 53.85 km long railway tunnel that connects Imabetsu Town, Higashitsugaru District, Aomori Prefecture on Honshu with Shiriuchi Town, Kamiiso District, Hokkaido, and was the longest undersea tunnel in the world at the time
The "Seikan Tunnel Entrance Plaza" near the entrance on the Aomori side , and a "Tunnel Shrine" has been erected to commemorate the opening of the Hokkaido Shinkansen.

The sacred object a stone that was excavated when the main mine was drilled a "penetration stone" that has been preserved by local residents is also installed to the right of the worship hall.
reference
- Wikipedia: Seikan Tunnel
- Imabetsu Town Official Website: Seikan Tunnel Entrance Square




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