She'd been digging an intricate tunnel under her northern Virginia home. ... "It goes about 30 feet down, the first tunnel," ...

After some digging, he discovers a shaft that looks like a bottomless well. When I went down the tunnel I felt fear rise up in me. It was like losing control.

1. You did your homework and know that if you dig a straight hole down in the United States, you’ll come out the other side not in China, but in the Indian Ocean.

Scientists look at how ants dig tunnels, and come up with some surprising results. Slip beneath the surface and the above-ground simplicity of an ant hill gives way to subterranean complexity.

To dig the tunnel, NFM Technologies, a subsidiary of Framatome, is building the world's largest earth-pressure tunnel-boring machine. It will have a cutting head 48.8 ft in diameter.

Imagine two towns on two opposite sides of a mountain. People from these towns would probably have to travel all the way around the mountain to visit one another. But, if they wanted to get there ...

She'd been digging an intricate tunnel under her northern Virginia home. ... "It goes about 30 feet down, the first tunnel," Kala said. ... I was a straight A student in that area.