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

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 is usually off-limits when it is filled ... west end of the passage to give The Times and others a rare look inside. “It's an engineering marvel,” said John Bednarski, an assistant ...

The tunnel is usually off-limits when it is filled and coursing ... California opened the west end of the passage to give The Times and others a rare look inside. “It's an engineering marvel,” said ...