It took about 20 minutes to reach the entrance of the underground laboratory, a laboratory with world-class geology in an inconspicuous part of the tunnel. Li Guanghan and his fellow scientists changed into laboratory-specific shoes and helmets, and walked into the narrow corridor at the entrance of the laboratory with excitement and excitement. At the end of the corridor is the institute and the dedicated laboratories of Hwascheung University. At present, two top scientific research institutions in China have set up special laboratories here, which take two different direct detection methods to find dark matter.

Along the way, Lee's heart was throbbing, and he always felt like something was going to happen. After settling down, he made a call to Deng's house from a landline, and everything was normal and safe; He called Roujia again to tell her that he had arrived safely, and then confirmed the contact information in case the phone was not working; He also felt uneasy, so he called Chen Aili again, she was busy preparing experimental materials and scientific research instruments, and said that she would postpone the time to enter Sichuan. Because a group of foreign experts also came to inspect the laboratory environment, they had to wait in Beijing to enter Sichuan together. Now that everything is peaceful and nothing has happened, Li Guanghan breathes a sigh of relief.

The underground lab is a clean, dark place. The cleanliness lies in shielding most of the cosmic rays, except for dark matter, which can sneak through layers of rock, and all other rays are filtered out. The detectors in the laboratory are surrounded by a protective layer more than a meter thick, in addition to the lead layer, made of other materials such as pure copper oxide, which is used to block all gamma rays and neutrons. Lee only had to look at the computer screen in the next room to see the dark matter captured by the detector. It's really exciting to look forward to the scientific research results of this genesis.

Stay in the cave, you can't tell the sunrise and sunset outside the cave, and you don't have to pay attention to the wind and rain of the world. In this place where the sound of even a hair falling on the ground could be heard, Li Guanghan seemed to hear the sound of the detector. He looked at the computer screen, and there seemed to be a faint light. He excitedly pointed it out to his colleagues, who all looked at him blankly, and the others noticed nothing.

Li Guanghan was a little disappointed, but an old professor at Huajing University comforted him and told him to go back to the dormitory to rest and relieve the pressure. He also felt that he was too anxious and hallucinated, so he decided to go back to the dormitory early to take a shower and sleep.

Li Guanghan slowly walked down the narrow corridor outside the dedicated laboratory. There is also a laboratory on the side of the corridor, which belongs to another top university in China, and when he passed by the door, he felt that he heard the prompt sound from the detector, but the researchers inside did not seem to move, he stood by the door and listened for a while, still silent. Lee thought he should have had a good night's sleep.

The dark and narrow corridor was unusually long at this time, and Li Guanghan walked unconsciously for a long time before he reached the station at the exit. Suddenly, he heard a faint "humming" sound, and he felt as if he was in a stone-sealed interior space. By the faint light, he saw that the stone chamber was surrounded by flat walls, and there were some frescoes on them; The space overhead is low and the stones are uneven, which can be somewhat oppressive and frightening; The ground was tilted upward, and seeing that his head was about to touch the top, Li Guanghan had to lower his head, bend over, and move forward slowly. Suddenly, the "buzzing" voice stopped, and the voice of a man with a Sichuan accent came: "Researcher Li, what are you looking for?" Dropped something? How to go back early today, I will help you call the driver over. ”

Li Guanghan raised his head and straightened his waist, it turned out that he had already walked to the exit at the end of the corridor. He looked back, and the corridor was still the same as usual. And the scene he had just passed, he was neither in a dream, nor in a high fever, he thought he was awake, and it was completely immersive. It's clearer than thinking after using the Spirit of a Thousand Dreams. He regretted that he didn't have a flashlight or a cell phone with him at the time, so he couldn't see the murals on the walls.

When Lee returned to his dormitory, he was still thinking about the scene he had just seen with a strange "buzzing" sound, and this time it was so real that it felt like it was happening in reality. After so many incredible things and changes in himself, he even felt that these hallucinations were nothing, and just hoped to be inspired by them.

Since that day, Lee has tried to walk alone through the dark corridor several times, and each time he has brought a flashlight with him. But there was neither a "buzzing" sound, nor was the stone chamber seen.

Chen Aili called, and they were about to leave for Sichuan as the second batch of researchers from the research group of Huajing University. She asked Li Guanghan if there was anything he needed to bring from Beijing, and said that she would arrange for her colleagues to take care of Roujia's mother and son.

The spring rain in Sichuan is dripping non-stop, and the terrain of the basin is already foggy, and the sun cannot be seen, and once it rains, it will be even more gloomy. The valley was damp, and the peaks on both sides of the road were no longer in sight, shrouded in mist.

Chen Aili and her entourage took two minibuses on the winding mountain road, one carrying teachers and students from Huajing University and the other carrying experts from abroad. The people in the car looked at the scenery outside the window, which was completely different from Beijing, and sighed that "the car walks by the river, and the people swim in the painting". A middle-aged woman with delicate facial features and a beautiful posture was staring at the verdant mountains on the opposite bank at the moment, and her expression was stunned and she was speechless.

In the evening, the two vehicles finally arrived at the hydropower station. Li Guanghan: When they heard the news, they came out to greet them. The rain was still falling, but the front of the dormitory building was very lively, and everyone enthusiastically helped carry luggage and equipment. The experts who came from abroad also got out of the car, and the leaders of the laboratory introduced these experts to everyone one by one.

In order to cover the scar on her forehead, Chen Aili still wears a narrow top hat. She saw Li Guanghan from a distance and waved at him. However, Li Guanghan stood there in the rain, motionless, and didn't see Chen Aili at all. In front of him, facing each other, stood the lady who was silent in the car.

The two of them looked at each other for a long time in the rain. Chen Aili's cry broke the silence, "Hey, Mr. Li, why are you standing here in the rain?" ”

Li Guanghan came back to his senses and hurriedly beckoned the lady into the corridor. The three of them were drenched, and Chen Aili sneezed vigorously. Li Guanghan hesitated to speak, as if he was thinking about the words in his head.

"Mr. Li, you know this Dr. Su, I just met when I was in Beijing." Chen Aili quietly asked Li Guanghan while Dr. Su was taking off his windbreaker.