Tunnel
A tunnel is an underground or underwater passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though som...
Tunnel - Wikipedia
30 YEARS AGO, A DIVER DISCOVERED SOMETHING THAT CHANGED THE COURSE OF HUMAN HISTORY
Though it’s only about the size of New Jersey, Israel is rich with history and religious significance. It’s so historically significant, in fact, that several of its wonders are still being discovered...
The Mystery of Atlit Yam, the 9,000-Year-Old Well-preserved Underground City
Not far off the coast of the village of Atlit in the Mediterranean Sea, near Haifa, lies the submerged ruins of the ancient Neolithic site of Atlit Yam. The prehistoric settlement, which dates back t...
Massive, 12,000-year-old underground tunnels stretch from Scotland to Turkey
There are countless, extremely ancient underground tunnels and chambers that stretch across the European Continent. These massive, 12-000-year-old underground tunnels are the product of ancient man wh...
Incredible Bridge Transforms Into a Tunnel
The Oresund Bridge connects Denmark and Sweden in a unique cable-stayed bridge to sunken tunnel road and railway system, including an artificial island.
Grand Canyon Underground Citadel - Evidence of Giants and Underground Cities in America.​​
The most famous report - about giants and underground cities - appeared in the April 5, 1909 edition of The Arizona Gazette, entitled “Explorations in Grand Canyon.” Explorer G.E. Kinkaid discovered a...
Not Many People Know About The City 1200 Feet Below Detroit
"It’s no secret that Detroit has been hit very hard by the recession. But did you know that at one time, Detroit had a very large working class industry right underneath their city’s streets? That’s ...
Will We Ever… Live In Underground Homes?
In many respects, Bernadette Roberts’ three-bedroom house is like any other. “Lounge, dining area, kitchen – it’s got all the mod cons. It’s like a normal home.” Only it’s not a normal home – Roberts ...
12 of the worlds most fascinating tunnel networks
Networks of secret passages and tunnels have been built on a giant scale, from components of the Maginot line to the Viet Cong Cu Chi Network. Others perform a peacetime function, such as the half mil...
A Trip Inside a 70-Year-Old Wind Tunnel
Wind tunnels are amazing. These massive structures made remarkable contributions to science and engineering, and from a photographer's perspective they are simply gorgeous, dramatic spaces. A few days...
Earthscrapers: Is Going Down Instead Of Up A Greener Way To Build? : TreeHugger
A quarter of a million blogs and magazines can't be wrong.
Truck Driver Confirms Underground City Beneath US. 2013 - YouTube
Mar 3, 2013 ... Interview with a truck driver who is entering an underground city and roadway system that stretches for thouslands of miles benieth the U.S. The ...
Underground city
An underground city is a series of linked subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausolea; wine or storage cellars; cistern...
Underground city - Wikipedia
Wind tunnel
A wind tunnel is a tool used in aerodynamic research to study the effects of air moving past solid objects. A wind tunnel consists of a tubular passage with the object under test mounted in the middle...
Wind tunnel - Wikipedia
Tunnel boring machine
A tunnel boring machine (TBM) also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They can bore through anything from...
Tunnel boring machine - Wikipedia
Pipe jacking
Pipe ramming is a trenchless method for installation of steel pipes and casings. Distances of 30 m (150 feet) or more and over 1,500 mm (60 inches) in diameter are common, although the method can...
Culvert
A culvert is a structure that allows water to flow under a road, railroad, trail, or similar obstruction. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforc...
Culvert - Wikipedia