Norway has proposed plans to build the world’s first underwater floating tunnel, and it’s cost nearly $25 billion.

To help cut down the 21 hours and seven ferry crossings it takes to drive from the southern city of Kristiansand to Trondheim, the Norwegian Public Roads Administration (NPRA) has proposed the world's first underwater floating tunnel, which would be submerged in the Norwegian Sea.

If the proposal passes, the tunnel would be built with two 4,000-foot-long, curved concrete tubes, submerged 66 feet below the surface of the Norwegian Sea.

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