The world's deepest road tunnel has become more expensive again. Costs are at a record high.

The Rogfast underwater road tunnel in Norway, set to be completed by 2033, faces financial issues causing delays. The project, which began in 2018, has a projected cost of at least $2.4 billion. The tunnel will enhance connectivity along Norway's west coast, featuring a unique double roundabout 260 meters underwater. It aims to reduce travel time significantly on the E39 highway, eliminating the need for ferries. The project is part of a larger initiative to modernize the coastal highway, expected to be fully completed by 2050, with a toll of approximately €53 per crossing.