Engineers are carving the Rogfast link beneath Norway’s fjords, a 26.7‑kilometer highway that will plunge to 390 meters below sea level, making it the deepest and longest subsea road tunnel on Earth. Swiss contractor Implenia and Swedish firm Skanska are blasting from opposite ends, using drill‑and‑blast rather than tunnel‑boring machines to navigate the complex glacial rock.

Construction crews work 12‑hour shifts in darkness, relying on daily laser scans to keep the two headings aligned within a few centimeters. Each explosion advances the tunnel five to six meters, while ventilation shafts, undersea roundabouts and rescue chambers accommodate the harsh pressure of over 500 psi. Water ingress is managed by drilling probe holes and pumping cement‑based grout whenever flow exceeds four liters per minute.

The tunnel will replace two ferry routes, shaving 40 minutes off the five‑hour drive between Stavanger and Bergen once it opens in 2033. Its four lanes will run beneath Boknafjord and Kvitsøyfjord, with a 50‑meter rock ceiling separating traffic from the sea. Rogfast demonstrates that large‑scale subsea infrastructure remains feasible despite logistical and geological challenges. It will also boost regional commerce.