The largest dual gauge underwater tunnel is called _________ rail, and it is situated in Japan.

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Eastern

Ikigai

Shanghai

Seikan

answer is D.

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Detailed Solution

The largest dual gauge underwater tunnel is located in Japan and is called Seikan rail.
Geospatial surveying commenced in 1946, and construction began in 1971. In 1988, the tunnel's construction was finished and it was inaugurated. A segment of the 53.85 km long Seikan rail that is 23.3 km long is submerged. Thus, it is the longest underwater tunnel in the world. It is also the second-deepest and second-longest main-line railway tunnel in the world.

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