Eight photos: Inside the world’s longest undersea road tunnel 8 photos Already under construction, Rogfast will be the world’s longest and deepest undersea road tunnel, spanning 27 kilometers (17 miles). Click on the gallery to see more. Skanska Eight photos: Inside the world’s longest undersea road tunnel

Already under construction, Rogfast will be the world’s longest and deepest undersea road tunnel, spanning 27 kilometers (17 miles). Click on the photo to see more. Skanska

The tunnel will have two separate tubes, each with two traffic lanes, exclusively for road traffic. At its deepest it will be 392 meters (1,286 feet) below sea level. Skanska

By replacing existing ferry connections, Rogfast is intended to reduce travel time between two of Norway’s biggest cities — S

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