There are many breathtaking natural miracles in the world, as well as man-made miracles, and human beings are always breaking through themselves in the world. What the tallest building, the largest tower, the longest canal and so on, the longest undersea tunnel is undoubtedly one of the outstanding achievements.
Where is the longest undersea tunnel in the world? This tunnel is known as the "Eighth Wonder of the World" and it is 50 miles long5 km, the deepest reaches 75 meters below the seabed. Its construction began in 1988 and after six years of hard work, it was finally officially opened to traffic in 1994. It is located between the United Kingdom and France, connecting Dover in the United Kingdom and Calais in France. The tunnel was constructed using an advanced shield method and consists of three parallel tunnels, with a high-speed railway tunnel in the middle and service tunnels and safety tunnels on both sides. This design not only ensures the safety of driving, but also facilitates the maintenance of the tunnel.
This tunnel is called the Channel Tunnel. It is currently the longest undersea tunnel in the world, and the realization of this great project embodies the wisdom and sweat of countless engineers and construction workers, and is a witness to the creation of history by mankind.