China has completed the world's largest underground neutrino detector: the installation with a height of 12-storey building is located at a depth of 700 meters in Guangdong Province, and its construction took almost 10 years and $376 million. Neutrinos, which will capture the sphere - mysterious and extremely poorly understood particles, formed including in black holes and inside stars. They almost do not interact with matter and move at close to the speed of light. As scientists say, the system will help to greatly advance their study, and will be important for fundamental physics and a better understanding of the structure of the universe.