SMRTR Science & EngineeringJun 22, 2026MIT Technology Review

Inside the world’s deepest and longest subsea road tunnel

SMRTR summary

Norway is building Rogfast, the world's longest and deepest subsea road tunnel — 26.7 kilometers long and 390 meters below the North Sea. Using controlled explosives rather than boring machines, crews battle constant water seepage and complex geology, with completion expected in 2033, eliminating two ferry routes and cutting regional travel time significantly.

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