Norway's Rogfast project is currently making massive strides as it aims to become the world’s longest and deepest undersea road tunnel. As of early 2026, construction is in full swing across multiple major contracts to bridge the gap between the coastal hubs of Stavanger and Bergen. The twin-tube tunnel will stretch approximately 27 kilometers and reach a staggering record depth of 392 meters below the North Atlantic seabed. One of its most unique features is a massive double roundabout carved 2

Lærdal tunnel - the worlds longest 🤩🇳🇴 | Spectacular Norway