Norway is building a huge undersea road tunnel called Rogfast beneath the North Sea. The tunnel will run 27 kilometres and reach depths close to 400 metres below sea level. It will connect Randaberg and Bokn as part of the E39 coastal highway. This highway currently requires seven ferry rides to travel along the western coast. Rogfast will help drivers avoid these ferries for smoother travel. Work started in 2018 but paused in 2019 due to costs. After changes, construction resumed in 2021. The project is expected to finish by 2033 and cost about 25 billion Norwegian kroner (roughly 2.4 billion US dollars). Building the tunnel is a big engineering challenge. Teams are digging from both ends under the seabed, aiming to meet with just a 5 cm margin of error. Laser scanners help by mapping every section with millions of data points, creating precise digital models. This helps reduce costly mistakes. Water pressure and leaks from saltwater are major concerns. The builders use special grouting to seal cracks and keep the tunnel dry and safe. The northern section, about 9 km long, is the deepest and toughest part. The tunnel will have two tubes with two lanes each. There will be a double roundabout around 260 metres underwater linking a branch to the island of Kvitsøy. Air quality will be managed by a strong ventilation system and real-time cameras and sensors will monitor traffic and safety. Anne Brit Moen from Skanska said, "Water ingress has already occurred during excavation," but the team is working on better sealing methods. Moen added the tunnel will support jobs beyond the ferry industry by improving road access for work, education, and services. It is also expected to help industries like seafood processing by lowering transport costs. Rogfast will quietly transform travel and commerce on Norway’s west coast over many years, replacing ferries and connecting communities with a high-tech road link deep beneath the ocean.