Deep in the mountains of Switzerland lies a marvel of engineering, the Gotthard Base Tunnel. This is the longest railway and ...

The Ryfylke Tunnel is the longest undersea road tunnel in the world at present and stretches some 8.98 miles between ...

The Texas Department of Transportation is set to launch one of Austin’s largest underground construction projects in 2026—digging 6.5 miles of 22-foot-wide tunnels beneath the city’s busiest highway.

Fort Wayne city officials on Tuesday invited news media to the site where a working shaft is being excavated for the Three Rivers Protection and Overflow Reduction Tunnel. Construction on the $187.7 ...

An underground 20-mile complex of tunnels, shafts, underground railway stations and combat facilities built by the Nazis was ...

Hidden beneath the sands of Egypt's Giza Plateau, three precisely engineered shafts have been rediscovered that may unlock access to a vast underground network whispered about by ancient Greek ...