What's the secret in the depths of the earth? Four huge projects built in the ground, and only the skin is understood?

With the maturity of human science and technology and the broadening of our horizons, we have gradually shifted from exploring the interior of the earth to the mysterious space field, and gradually learned that the universe is extremely vast. In contrast, the earth and human beings are small, even not a grain of sand in the vast universe. However, the imagination and curiosity of human beings are infinite, and the spirit of daring to explore has been continuing, so human beings can overcome one problem after another, break through many difficulties, and let human civilization develop rapidly to this day.

It is said that the more you learn, the more you won't. Although human beings have made great breakthroughs in the field of space, the more they understand, the more they can find their own shortcomings, and there are more questions waiting for human beings to explore and answer. In addition to the unknown in space, there are many places on the earth where we have been living that have not been explored and understood by human beings. Human beings know little about the information from the surface to the depths of the earth. Today, I will tell you what secrets are in the depths of our earth under the popular science!

the diameter of our earth can reach 12,756 kilometers, and the outermost layer has a crust about 3 kilometers thick, but our current science and technology are not capable of reaching the depth of the outermost layer of the earth. Although we haven't gone deep into the underground world of the earth, the use of the underground is also greatly strengthened. We take the subway, the underground shopping mall we usually use for shopping, and it is possible to build underground cities in the future. There is the deepest hotel in the world at the bottom of the earth 155 meters. It is the Sala Silvermine Hotel from Switzerland. The cheapest one-night stay here is 4, RMB. There is the deepest undersea tunnel in the world at a depth of 24 meters underground? Qinghan Tunnel, an underground tunnel in Japan, has a huge construction, with a total length of 54 kilometers. It took 24 years to finally complete and cost 7 billion yen to build.

China's underground exploration technology has also been improving, while China's? No.2 well of continental scientific drilling in Songliao basin? At present, it is the first continental scientific drilling well in the world to drill through Cretaceous continental strata, with a depth of 64 meters. With the improvement of the scientific research level of the earth, we can know more about the earth we live in now.

how deep is the deepest drilling in the world at present? In Murmansk region of northwest Russia, there is the deepest drilling well in the world. This drilling was designed in 1966, started in 197, lasted for 22 years, and stopped in 1992, with a depth of 12,262 meters. It didn't stop work suddenly, and it was not understood by people.

When the drilling rig reached 7m, scientists were surprised, and a large number of single-celled fossils were discovered, waiting for further research. When drilling to about 9 meters, we found a surface full of gold and diamonds. The quality of gold is very high. It can be seen that the underground is rich and colorful, with a lot of resources and many unknown places waiting for human exploration.

The diameter of the earth is 12,756 kilometers. At present, the deepest hole drilled by human beings is 12,262 meters, so we can only know a little fur. The main reason is that it is too difficult to drill a hole deeply. The temperature inside the earth is too high. The deeper it goes, the higher the temperature will be, reaching between 4, and 8, degrees Celsius. The drill bit we are applying now is far from being able to withstand such high temperature. Even if it can withstand it, the rock inside is very hard, and it will lose its hard drilling ability because of the high temperature.

I believe that with the update of human equipment and the continuous development of science and technology, one day we will know what the interior of the earth looks like, and both the underground world and the underground people who have been concerned about it will unveil the mystery.