Let me introduce you to the Seikan Tunnel [1] between the islands of Honshu and Hokkaido in Japan, 53.85km with 23.3km of that under the sea. [1] https://en.wikipedia.org/wiki/Seikan_Tunnel
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Let me introduce you to the Seikan Tunnel [1] between the islands of Honshu and Hokkaido in Japan, 53.85km with 23.3km of that under the sea. [1] https://en.wikipedia.org/wiki/Seikan_Tunnel
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