The biggest engineering challenges ever

Tunnels have always been part of life connecting one place to another they have been constructed underground, through the mountains and the most amazing place beneath the water. Thames tunnel was the first such tunnel which was built in the late 19th century and the latest is Japan's Seikan tunnel which extends 54 kilometer long connecting Hokkaido Island to Aomori Prefecture. China is planning to build the world's longest tunnel by 2020 which will be over 120kilometer, it will be an engineer challenge for China.Building underwater tunnels requires high level of precise engineering and plans which are to be executed properly. These all tunnels are built or yet to be built seemes possible with our knowledge of science and engineering. 

The red line shows the tunnel below ocean surface 

There is one project that will challenge all our knowledge and skills know as the Transatlantic Tunnel. It seems good only in papers the 5000 kilometer underwater tunnel in Atlantic Ocean connecting London with New York will allow the to travel only is 40 minutes or more much faster than airplane. This project has been in highlights many times a movie is also there but the main problem lies in our knowledge of science and engineering. It is yet a hypothetical project but if we start building it right now it will be the most extreme challenge every. In the 20th century telegraph wires were laid down on Atlantic Ocean bed and it was not a big deal but to construct such tunnel on ocean bed is nearly impossible as the bed is not levelled there are trenches and the depth is uneven so this can only be solved by building it in the middle of surface and bed but it should be still at one place and should not submerged into water so it has to be tightened to the ocean floor by cables. Now comes the material used for construction, we have been able to creat strong alloy of titanium and other metals suitable for such very small scale operation but it is beyond our courage to produce such strong material to build 5000 kilometer long tunnel it's vastness can be calculated if we use steel it would take all the steel produced by humans in an year without using steel for any other operations. Steel is not corrosion resistance material and sea water promote corrosion at the highest rate so it would be a big deal to overcome the corrosion effects. The next big challenge lies in the technique used for construction in water. The traditional technique used a pipe inside which construction is done and then pipe is removed but for 5000 kilometer it won't work. Time duration plays a major role it is estimated that at least 50years will take for this project to complete. The most important is money it is sure that considering 100 billion $ will be the least purposed amount and it will go on increasing. These are the major challenge only in construction from the point of an engineering. The list will go on increasing. It is not an impossible but not for our generation.
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