SMRTR Science & EngineeringDec 3, 2025Interesting Engineering

Norway building world’s deepest road tunnel plunging 1,280 feet under the sea

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Norway is constructing the world's deepest undersea road tunnel, plunging 1,280 feet below sea level and stretching 17 miles to connect Stavanger and Bergen without ferries. The $2.4 billion Rogfast project, expected to complete by 2033, will cut travel time by 40 minutes while facing major engineering challenges from saltwater leaks and extreme underwater pressure.

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