Introduction of the longest subsea tunnel in the world?

What is the longest undersea tunnel in the world at present? What is the basic profile? The basic contents of the world's longest undersea tunnel are as follows:

Through the knowledge collation of the architectural knowledge column of this website, Zhong Da Consulting Company found the basic information of the world's longest subsea tunnel as follows:

At present, the English Channel Tunnel is the longest undersea tunnel in the world. In order to help people understand the English Channel Tunnel, Bian Xiao compiled relevant information. The basic overview is as follows:

Brief introduction of the English Channel Tunnel, the longest undersea tunnel in the world;

The English Channel Tunnel, also known as the European Tunnel, is a railway tunnel connecting the British Isles with Europe and France. Opened on May 6th, 1994. It consists of three parallel tunnels with a length of 5 1km, with a total length of 153km, of which the subsea tunnel is 3×38km, which is the longest subsea tunnel in the world at present. The tunnel crosses the English Channel, greatly shortening the time from Europe to Britain. The length of the tunnel is second only to the Japanese Han Qing Tunnel. The seabed is 39 kilometers long. It takes 35 minutes one way. Trains passing through the tunnel include long-distance trains, special section trains for highway trucks and section trains carrying other highway vehicles. The tunnel is operated by Eurotunnel Technology, but the company is heavily in debt due to the extremely high construction cost.

The longest undersea tunnel in the world-the construction process;

The idea of establishing a fixed channel between Britain and France can be traced back to the era of Napoleon I at the beginning of19th century. For a long time, the main reason why Britain opposes the construction of the English Channel Tunnel is that they want to use the English Channel as a natural barrier against military invasion from the European continent, considering military risks. With the changes in the international situation, these concerns have gradually subsided. Later, Britain joined the European Community, expecting a unified European market, so it became an obvious need to establish a more convenient and efficient channel between Britain and the European continent.

From 1757 to 1867, engineers and geologists in Britain and France put forward many opinions and design schemes for the construction of the English Channel Tunnel, but they were not realized for various reasons.

1875, French drilling in the seabed near Garmy and Deauville, England. In 1878, two vertical shafts were built, and a small tunnel with a diameter of 2 135 mm was excavated. Due to lack of funds, Britain started to work in 188 1 year, and two tunnels with a diameter of 2 139mm and a length of 732 and/kloc respectively were excavated. However, in 1882, the project was forced to stop because of policy and war.

1963, the French-British Committee chose to build a two-lane passage under the strait. A third line is set between the two lines as an auxiliary line, with a total length of 52km. This scheme is the prototype of the future tunnel. 1964, the British and French governments signed an announcement on the construction of the tunnel. The tunnel project officially started on 1974.

1986 In February, the foreign ministries of Britain and France signed a treaty to build the English Channel Tunnel. The two governments ratified this treaty in July 1987. Construction officially started.

1994 was officially opened to traffic on may 7, which lasted more than 8 years and cost about1000 million pounds (about1500 million dollars). It is also the largest project built by private capital in the world.

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