Tunnels are used for transportation, mining, and drainage purposes, as well as for installation of power sources. Although tunneling is difficult and dangerous, the benefits are often worth the effort. Early civilizations relied on tunnels to transport...

A tunnel is an underground passage way. The definition of what constitutes a tunnel is not universally agreed upon. However, in general tunnels are at least twice as long as they are wide. In addition, they should be completely enclosed on all sides,...

Gazans are finding an antidote to their growing isolation: digging tunnels under their border with Egypt to smuggle everything from weapons to cigarettes to people.A group of smugglers recently gave an Associated Press photographer rare permission to accompany them as they dug one tunnel. In...

They look like greenhouses _ hut-like structures swathed in plastic that serve as cocoons for growing tomatoes, lettuce, peppers, carrots, strawberries and bushels of other fruits and vegetables. Called high tunnels, the buildings are popping up in Ohio fields and around the country as farmers...

U.S. and Mexican law enforcement agents executing simultaneous raids discovered a recently completed smuggling tunnel linking the two countries, officials said Friday.The entrances to the tunnel, described as a passageway its builders planned to use to smuggle drugs, were discovered in a home in Nogales,...

Falling slabs of concrete and asbestos exposure are two reasons that a federal agency should investigate the passages under the U.S. Capitol complex amid an ongoing safety dispute with the Architect of the Capitol, a group of tunnel workers said Thursday.They said they asked National...