Just before two o'clock, Lin Chuan was woken up again. "There is movement outside." Zeng Yu said softly. Nothing could be heard through the thick protective door, but after taking the stethoscope, Lin Chuan heard the sound of the rolling shutter door being hit behind the door. Zeng Yu looked at him nervously. "It's okay, they can't come in." He comforted them. As soon as the voice fell, there was only a "crash" sound, which seemed to be the rolling shutter door breaking open, and then the protective door outside made a "bang" sound. It is already late at night, and most people have gone to bed, but there are also many people who cannot sleep because they are not accustomed to the environment. This soft sound in the quiet night made them all sit up in shock. A child started to cry, and the continuous "bang bang" sound was like raindrops hitting the roof, almost becoming one sound. "They can't come in." Lin Chuan said loudly. "There is a protective door outside!" He saw that the faces of the people around him were pale, and everyone knew what would happen if these doors were lost. Almost everyone was awake, but except for the faint cry, no one spoke. Their eyes were fixed on the door closest to them, listening to the faint crashing sound like the footsteps of the god of death. Half an hour later, there was no change in the situation. People finally felt relieved and fell asleep one after another. Someone habitually wanted to smoke, but after looking at Lin Chuan who was leaning against the door with a gun on his back, he gave up the idea. "Brother Lin, how do you think they found us? We are already hiding in such a hidden place." Zeng Yu asked. "You should have heard the sound of generators and fans, or smelled the smell we left behind." Lin Chuan guessed. "With so many of us coming in and out during the day, we must have left a lot of traces." "It must be the smell," Zeng Yu said. "Why are there so many people relieving themselves? I'm almost fainting." There is a small toilet in the fortification, but the amount of excretion of more than 2,000 people is beyond imagination, and they have to flush it with precious water every two hours , otherwise the smell would be unbearable. Lin Chuan smiled and said nothing. He really didn't want to discuss this issue. Fortunately, Zeng Yu himself quickly changed the subject. "What if they don't leave tomorrow?" he asked suddenly. "How is that possible?" Jiang Ming said from the side. "It's hard to say." Zeng Yu seemed to be energized and continued. "They hide underground as soon as daylight comes, but we are underground now! If they regard the passage outside as their nest, what should we do?" "Don't talk nonsense!" Lin Chuan pushed it with his arm. He couldn't control his last voice, and some people looked panicked when they heard his words. Zeng Yu also realized that he was almost spreading despair and quickly shut his mouth. But his question really stuck in everyone¡¯s hearts, making them no longer in the mood to chat. The light bulb suddenly lit up, and Lin Chuan felt a little strange. He saw the mechanic named Wang Qinian waiting for the toilet nearby, so he walked over. "The output power of the generator is fixed. When the light bulb becomes brighter, it means the voltage has increased." After listening to his question, Wang Qinian explained. "The voltage is rising?" Lin Chuan University's physics knowledge has long been returned to the teacher. He just remains alert to any abnormal situation. "Under what circumstances will the voltage suddenly rise? Is the generator faulty?" His first reaction was everyone's safety. "Do we have a backup generator?" Wang Qinian shook his head palely. "The increase in voltage means that the power consumption is reduced." His eyes widened, as if he thought of something very scary. Lin Chuan looked around. The TV had been turned off, and the only places that used electricity now were lights and ventilation equipment. Ventilation equipment? ! He turned his head to look at Wang Qinian and pointed at the ventilation duct. The latter nodded slowly. "There are six ventilation ducts in total, but we don't know which one has the problem now." Wang Qinian said with sweat profusely. In order to prevent panic, they only called Zhang Guohui and Ma Guoming. "If there is a problem with just one pipeline, it shouldn't have any impact on us, right?" Ma Guoming asked. He looked at the six large fans on the wall. They were all spinning slowly, and he couldn't see what was wrong. The damaged fan must be at the outlet of the ventilation duct. "The design here was not designed to provide refuge for so many people. You can also feel that the air is already very turbid. If there is another problem with the ventilation ducts, people with poor health will not be able to escape."?Will go into shock due to lack of oxygen! "Chen Jian was pulled over. As a student at the Medical University, he is currently the most authoritative medical expert in the civil air defense field. "If that's the case, that's it. What I'm worried about is the more serious consequences. Lin Chuan said in a low voice. "Wang Qinian said that they had checked every fan very carefully during the day and performed maintenance. It makes no sense that it would break down in just a few hours." Unless something crawled in from that end and jammed the fan. " "Where are the exits? What is it like? "Zhang Guohui instantly understood the seriousness of the problem. "They are all in the green belt on the roadside. In order to prevent rain, they are all downward U-shaped structures. The diameter of the pipes is about 60 centimeters. "Wang Qinian was so anxious that he almost cried. "Originally, there was a rodent-proof net. After we looked at it during the day, we felt that there was no problem. " " Anti-rat net? "Zhang Guohui wanted to crush him to death. "Didn't I tell you to plug up all the holes? " "But we need to rely on it for ventilation, there is no way to block it! "Wang Qinian said with a sad face. "I thought the blades had been rotating rapidly and it was impossible for them to come in from there. " "If something goes wrong, it's all your responsibility! " Zhang Guohui shouted in a low voice. The generator suddenly made a strange noise, and after a while the light bulb became brighter. " Oops! "This is what everyone is thinking. "Is there a rat-proof net in the pipeline? Lin Chuan still held on to a glimmer of hope. "It shouldn't happen." "Wang Qinian shook his head in despair. "The pipeline is too long, and there are fans at both ends. I didn't look carefully. " "We were all killed by you! "Zhang Guohui said angrily. "Stop talking about this, we must find a way now. When all the fans stop, these two thousand people will not survive. " Lin Chuan interrupted them. "Unless we can open the door and go out. "Zhang Guohui said angrily. "It's only half past three, and those rats are still bumping around outside. " Everyone frowned. Lin Chuan recalled last night's experience and suddenly had an idea. "Do we have a steel frame? Or an iron frame? "He asked. "Yes, I moved it down specifically to store more things. Ma Guoming replied. "What's the use?" " "These mice are very big, and these protective doors are very thick. We can put the shelf behind the door to hold it up, and then open the door a crack. Lin Chuan replied. "As long as the doors on both sides are opened a crack, convection can be formed." " "no! " Zhang Guohui flatly refused. "It's too dangerous. If there is any mistake No, this is absolutely not possible! "He shook his head and said. "Last night, Li Mingfeng and I held up a door with just two people, and they didn't rush in all night. It makes no sense that it can't be done now that there are so many people. Lin Chuan said. "Actually, it's not that dangerous." " "Just two slits can't let in much air. "Zhang Guohui still objected. "It's not worth taking such a big risk. " "I recommend voting. Seeing that he couldn't be persuaded, Lin Chuan made another suggestion. "No!" "Zhang Guohui was a little anxious. Apart from him and Ma Guoming, the only ones who would vote against here were Wang Qinian, and there were five people on Lin Chuan's side. "It's not fair to vote like this! " "What should we do? Lin Chuan asked. "The air quality is getting worse and worse. If we delay it any longer, there will be problems soon!" " "I agree with Lin Chuan's plan. "Wang Qinian said suddenly. "Do you know what you are talking about? "Zhang Guohui suddenly became angry. "You are responsible for all this, and you still have the nerve to talk nonsense? " "Old Zhang, don't get excited! "Ma Guoming came out to smooth things over, and the surrounding survivors had heard their quarrel. "They want to open the door! " "are you crazy? There are monsters out there! " "I heard that the exhaust fan is broken! " "Nima, let's see who dares! I don¡¯t believe it! " "You can't do this, you are going to kill everyone! "People suddenly became angry, and soon others were woken up, and there was a mess in the civil air defense fortifications. Lin Chuan and Wang Qinian explained the reasons loudly, but it was of no use in such an environment. "They are all the guys in military uniforms. Damn it! "Suddenly someone said loudly. Lin Chuan looked for the source of the sound, but saw that the group of people he warned in the middle of the night were adding fuel to the flames in the crowd, inciting everyone's emotions. "It was he who broke the fan! Put him in charge! "They pushed the crowd to move this way. Many people didn't understand what was happening, so they followed the majority of people. "Calm down! Everyone, calm down! Don't mess around! "Linchuan tried his best toHe screamed with all his strength, but seemed so pale and feeble in the chaos. ¡°Click, click, click.¡± In the chaos, gunfire suddenly rang out. The bullet ricocheted off the wall and splashed a pool of blood in the crowd. Lin Chuan turned his head, and Zeng Yu stared at him dumbfounded. The muzzle of his gun was pointed at the ceiling, still emitting green smoke. "II just want them to calm down." He said in panic. "Killing people!!" Someone screamed hysterically.