In the 1930s, workers bored a 13-mile tunnel beneath Mt. San Jacinto. Here's a look inside the engineering feat that carries Colorado River water to Southern California.

Nick's Signal Spot explores the untold story of tunnel radio systems that bring AM and FM signals to life below the surface.

The tunnel-and-garage combo has sent some Salzberg ... “I think what amazes people is that a private individual can dig into the mountain,” Green Party official Ingeborg Haller, who is leading ...

The Zoji La Tunnel, which is set to be the longest in Asia, will pass under the Zoji La pass in the Himalayas, the world's highest mountain range. The aim of the tunnel is to provide year-round ...

Scott Reierson, an operations and maintenance supervisor for the Metropolitan Water District, leads a group on a tour, walking through a 16-foot-diameter tunnel toward the west portal of the ...