Norway is implementing one of the most ambitious road infrastructure projects in the world. This is the Rogfast underwater tunnel, which will be the longest and deepest underwater tunnel in the world after its completion.
With a length of 27 miles [27 km] and a peak depth of 392 feet [392 m] below sea level, the project aims to transform transportation along Norway’s western coast.
The tunnel will better connect the Stavanger and Haugsund regions, facilitating travel to the country’s main cities and reducing dependence on ferry transport.
Rogfast will consist of two separate tunnels, each in two lanes of traffic. One of the most specific elements of the project will be a double roll, built about 260m below sea level, which will enable connections to the island of Ktimes.
Currently, it takes about 21 hours to travel and use seven ferries to cover all of this route. The goal of Norwegian authorities is to create a ferry – free road corridor through the construction of tunnels and bridges.
One of the biggest construction challenges is ensuring that the two teams working from the opposing ends of the tunnel meet with a maximum shift of only two inches [5 cm].
Laser scanners and advanced measurement equipment are used to gather up to 2 million data stations per second. This data creates a digital pattern of the tunnel, enabling the ongoing comparison of works with the original design.
However, construction also faces major geological challenges. In some parts there have been considerable degradation of salt water, requiring special techniques for rock isolation and ensuring worker safety.
An advanced ventilation system, cameras, radar and technology for real-time identification of incidents will also be installed for the safety of automotive drivers.
Work began in January 2018, but it was cut off at the end of 2019 because of increased costs and contract restructuring. Construction resumed in late 2021.
The tunnel’s completion is forecast for 2033, while the cost of the project is estimated at about $2.4 billion.
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