Because we said it is!
Tunnel boring machines. These advanced engineering devices were used to cut through under the English Channel, one from either end. One of the machines was driven in a curve out of the way and abandoned underground while the other was hauled out and put up for sale. The links are to the Wikipedia article on the machines, and pictures of the unit used at Yucca Mountain to excavate rooms for the long term storage of high level nuclear waste can be seen. A link is provided to the BBC article on the sale of one of the original machines about which the question asks.
While there doesn't seem to be a consensus as to THE greatest, some of the greatest are The Millau Viaduct in France, the Venice Tide Barrier Project in Venice, the Three Gorges Dam in China, the National Stadium in China, Palm Island in Dubai, the Large Hadron Collider in Switzerland, the Channel Tunnel between England & France, the Bailong Elevator in China and the New Valley Project in Egypt.
Lupu Bridge arch joinsBy Jane Tian, Shanghai Star. 2002-10-10 The world's longest steel arch bridge will be in operation next year SHANGHAI has another rainbow across the Huangpu River. The last gap in the arch of the Lupu Bridge was successfully closed when a 6.8-metre-long section was lifted into place 100 metres above the water on October 7. With 2.2 billion yuan (US$266 million) of investment, the 3,900-metre-long bridge breaks the record for this type of bridge with its 550-metre-long main arch, 32 metres longer than that of the New Virginia Bridge in the United States. The main arch is made up of 27 sections connected synchronously from both sides of the bridge toward the centre. "The precise connection depends critically on the temperature and the wind velocity, which can be very difficult to handle but worth the pain for Chinese bridge builders,?Lin said. The joining was expected to have been completed in April but due to technical difficulties, the work was delayed till this week. The bridge has consumed more than 35,000 tons of steel and the next big job will be paving the roadway for traffic and installing horizontal cables to fasten the arch. The rest of the work will not be a problem as local builders are experienced in these aspects of bridge construction, Lin said. According to Hu Shide, an anti-seismic expert in Tongji University, the bridge, guarded with an advanced safety belt, can meet the challenge of an earthquake that happens once in 3,280 years. Vice-Mayor Han Zheng expects the bridge to be completed and in operation by May next year to relieve cross-river traffic congestion. "The bridge will also contribute to Shanghai's bid for World Expo 2010,?Han said. "If the bid is successful, some four square kilometres near the ends of the bridge will be turned into a venue.? Han also pointed out that Shanghai will have two more river-crossing projects next year: the Outer-Ring Road Tunnel to be finished by May and the Dalian Lu Tunnel to be in opened by the end of next year.---- Copyright by Shanghai Star.
Furka Summit Tunnel was created in 1926.
Summit Tunnel fire happened in 1984.
In 1988 the Bouygues construction arm, by then one of the world's largest building and engineering companies, began building the Channel Tunnel between France and England, a project that lasted until 1994.
Extreme Engineering - 2003 Transatlantic Tunnel 1-3 was released on: USA: 16 April 2003
Extreme Engineering - 2003 Mega Tunnel 4-2 was released on: USA: 8 March 2006
Yes. It is an amazing feat of engineering.
plezz wats the answer
Extreme Engineering - 2003 Hallandsas Ridge Tunnel Sweden 5-6 was released on: USA: 15 November 2006
In civil engineering, the invert level is the base inside level of a pipe, trench or tunnel the carries liquid, considered the "floor" level. It is used to determine the hydraulic gradient.
No, they haven't. It is conceptual. There is no proposed plan for building it either.
There are many possible answers to that such as a tunnel, an undersea tunnel, a great work of engineering, and international co-operation project and many others.
See link below!