At 392 Meters Under the Sea, Costing €1.9 Billion and Measuring 26.7 Km Long, the World's Largest Underwater Road Tunnel Will Be in Norway and Construction Has Already Begun

At 392 Meters Under the Sea, Costing €1.9 Billion and Measuring 26.7 Km Long, the World’s Largest Underwater Road Tunnel Will Be in Norway and Construction Has Already Begun

Written by Romário Pereira de Carvalho

Published on 21/10/2025 at 22:27

Imagem: Reprodução / YouTube

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With 26.7 km in Length and 392 m in Depth, the Rogfast Tunnel Promises to Revolutionize Transport in Norway by Halving Travel Time and Replacing Seven Ferry Crossings on Highway E39

Norway has launched one of the largest infrastructure projects in its history: the Rogfast tunnel. With 26.7 kilometers in length and 392 meters in depth, it will be the longest and deepest underwater road tunnel in the world. The expected completion date is in 2033, and the project promises to significantly shorten travel time between the cities of Trondheim and Kristiansand.

Half the Travel Time and End of Ferries

Currently, traveling the 1,090 kilometers of the E39 highway takes about 21 hours. This is because the route relies on seven ferry crossings, making the journey slow and subject to delays.

With Rogfast, the same stretch could be covered in approximately 10 hours, halving the travel time.

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Financing and Toll Model

The total investment for the project is estimated at € 1.9 billion. The Norwegian government will cover 40% of this amount, while the remainder will be financed through tolls. The anticipated fee is € 30 per vehicle.

This financing model has been designed to ensure the financial balance of the project without impacting traffic.

Moreover, the tunnel will be an efficient and permanent alternative to the ferries, which frequently suspend operations due to bad weather.

Unprecedented Engineering Under the Sea

Rogfast will be the first four-lane underwater road tunnel of its kind with these dimensions.

The construction requires advanced excavation techniques under the seabed, a challenge that reinforces Norway’s tradition in civil engineering.

When inaugurated, the project will place Norway at the forefront of global subterranean works and high-efficiency transport.

The country also hopes to boost tourism and regional trade, strengthening its economy with a stable connection throughout the year.

With information from Fórum Magazine.

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At 392 Meters Under the Sea, Costing €1.9 Billion and Measuring 26.7 Km Long, the World’s Largest Underwater Road Tunnel Will Be in Norway and Construction Has Already Begun

With 26.7 km in Length and 392 m in Depth, the Rogfast Tunnel Promises to Revolutionize Transport in Norway by Halving Travel Time and Replacing Seven Ferry Crossings on Highway E39

Half the Travel Time and End of Ferries

Financing and Toll Model

Unprecedented Engineering Under the Sea

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At 392 Meters Under the Sea, Costing €1.9 Billion and Measuring 26.7 Km Long, the World’s Largest Underwater Road Tunnel Will Be in Norway and Construction Has Already Begun

With 26.7 km in Length and 392 m in Depth, the Rogfast Tunnel Promises to Revolutionize Transport in Norway by Halving Travel Time and Replacing Seven Ferry Crossings on Highway E39

Half the Travel Time and End of Ferries

Financing and Toll Model

Unprecedented Engineering Under the Sea

Dissatisfied with seeing people sleeping on the street, a man named Ryan Donais started building small mobile homes so that homeless people can escape the cold, each equipped with a bed, running water, electricity, and heating.

Workers were opening a modern road in Dover when they found, 6 meters below the asphalt, a 3,500-year-old boat made of stitched oak and plant fibers.

A giant brown band visible from space, approximately 8,850 kilometers long, connected Africa to America in the Atlantic Ocean, and satellites revealed that it is neither land nor pollution, but the largest accumulation of seaweed in the world, which broke records in 2025.

Engineers want to carve through Africa with a giant canal to bring water from the world’s second-largest river to a dying lake on the edge of the Sahara Desert that has already lost 90% of its water.

Panama bets on a $4.5 billion railway bridge over the Panama Canal and calls on Renfe to validate a 450 km high-speed line that promises 50,000 jobs, but still faces the technical challenge of crossing one of the world’s most strategic routes.

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