The Seikan Railroad Tunnel

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At 33 miles long, the Seikan Railroad Tunnel is the worlds longest tunnel.

Túnel Ferroviario Seikan

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Seikan Tunnel

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The Seikan undersea tunnel

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The Longest Tunnel

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Describes the construction and history of the world's longest and deepest tunnel, the Seikan Tunnel in Japan, which connects Honshu to Hokkaido by rail.