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Norway Is Building the World’s Deepest and Longest Underwater Road Tunnel—And It’s a $2 Billion Engineering Marvel

Norway is once again pushing the boundaries of engineering excellence with a massive infrastructure project that’s capturing global attention: the Rogfast Tunnel, poised to become the deepest and longest underwater road tunnel on the planet.
Norway Is Building the World’s Deepest and Longest Underwater Road Tunnel—And It’s a $2 Billion Engineering Marvel
Currently under construction beneath the stunning fjords of Norway’s west coast, the Rogfast tunnel will plunge an astonishing 1,300 feet (390 meters) below sea level and span an epic 27 kilometers (16.8 miles) in length—smashing two global records in one bold project. Once completed, it will stand as both the world’s longest undersea highway tunnel and the deepest four-lane road tunnel ever built.

Estimated to cost $2 billion, this futuristic feat of infrastructure is scheduled for completion by 2033. When finished, it will seamlessly connect the E39 highway between Stavanger and Bergen, slashing travel times and creating a vital, storm-resistant route that’s independent of ferries or weather disruptions.

But the scale of Rogfast isn’t just impressive—it’s almost unimaginable. The project will require the removal of over 8 million cubic meters of rock, a logistical and engineering task that places it among the most ambitious infrastructure endeavors in modern European history.

Why It Matters
Norway’s landscape, famous for its breathtaking fjords and rugged terrain, has long posed transportation challenges. Traditional ferry routes and winding coastal roads are often slow and weather-dependent. Rogfast changes that—creating a fast, reliable corridor that could transform regional trade, boost economic growth, and improve daily commutes for thousands.

It also marks a major leap in tunneling technology. Working under intense pressure, extreme depth, and seismic risk zones requires sophisticated design, environmental protections, and cutting-edge machinery. The project is a testament to Norway’s leadership in sustainable and resilient infrastructure.


A Glimpse Into the Future
While Rogfast is uniquely Norwegian in its geography and design, its success could set a global precedent. As climate change, urban congestion, and geography drive the need for smarter infrastructure, ultra-deep tunnels like Rogfast may soon become blueprints for global megaprojects—from Japan to the United States.

Whether you’re an engineer, an urban planner, or simply a fan of human achievement, the Rogfast tunnel is one of the most exciting developments in modern infrastructure—and a bold example of how vision, persistence, and $2 billion can reshape the future of transportation.

Source: Norwegian Public Roads Administration (Statens Vegvesen)

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