If it weren't for what we saw in the camera, who would have thought of someone exploring the secrets of the depths of the universe 700 meters underground? This is the Jiangmen Neutrino Laboratory, whose research object is the mysterious Neutrino in the universe. Neutrino is one of the Elementary particle we know. It has a very small mass and a speed close to the speed of light. It seldom interacts with other particles and has a strong penetration. Because of the characteristics of Neutrino, studying their properties is of great significance for us to understand the evolution of the universe and the evolution of stars; Because of this, the Neutrino experimental device was built deep underground, and thick rock layers were used to block cosmic rays, so as to minimize the interference of external signals. The ability to build such an underground experimental device is itself a miracle. The Jiangmen Neutrino experimental device is located in granite texture, and it is extremely difficult to dig 700 meters vertically underground here. It is also difficult to build a 1300 meter long slope tunnel to go underground; At a depth of 700 meters, a spherical stainless steel mesh shell with a diameter of 41 meters was assembled, which is the largest single stainless steel structure in China. It is fixed with 120000 sets of high-strength bolts, and the deviation should be controlled within a very small range; The interior of the stainless steel mesh shell is the core structure of the detector, and the 35.4 meter diameter organic glass ball is composed of 263 organic glass plates spliced together. Before the detector runs, 20000 tons of highly pure liquid scintillator will be filled into the large ball, with no more than 8 milligrams of impurities mixed in; The detector is also equipped with 45000 Photomultiplier tube to convert the weak optical signal generated by the captured Neutrino into an electrical signal and amplify it by 10 million times. Behind all this is China's progress in basic science and related technologies. The civil works 700 meters underground, the manufacture and installation of large stainless steel structures and super large plexiglass balls, the preparation of liquid scintillators with high transparency and very low radioactivity background, and the localization of high-performance Photomultiplier tube require a strong Comprehensive National Power. Until now, there are only single digit large-scale Neutrino experimental devices in the world, and the Jiangmen Neutrino experimental device will be the leader in Neutrino research when it is completed. Once started, this will study the mysterious particles in the universe, generate experimental results, or change human understanding of the universe. The staff are engaged in seemingly dull but extremely romantic work - standing 700 meters underground, gazing up at the vast starry sky. Large scientific installations are powerful tools for promoting technological innovation and breaking through key core technologies. At present, China has laid out and constructed 77 major scientific and technological infrastructure projects, of which 34 have been completed and put into operation, and some facilities have entered the world's first tier. Basic research should ultimately serve the application. Although Neutrino are small and penetrating, one of the most imaginative uses is aerospace communication, even interstellar communication. Perhaps in the future, astronauts will burst out of the solar system and receive clear signals from their homes, billions of kilometers away from Earth. I believe people at that time will remember the efforts we made at a depth of 700 meters underground today. (New News Agency)