While Chen Xin was thinking about how to make snow tracks, the atmosphere in the city became increasingly tense.

Although the surface is calm, in fact, under the surface is a huge wave ready to go.

At the entrances of all major shelters, there are strict checkpoints set up by the municipal government’s management personnel, police and armed police forces, and strict inspections are carried out on everyone entering and leaving.

The manager is responsible for the identity review to ensure that every person entering and leaving the shelter gate is well documented and has a shelter residence certificate and pass issued by the city.

This is a management system that was implemented after a disaster. Although there was a pass and residence permit system before, the control was not very strict. Just like an ID card before a disaster, many people would not even carry it with them, but if it was strictly checked, everyone must have it and they can match it.

The police are responsible for security checks to ensure that people entering and leaving the shelter do not carry dangerous items or prohibited items. As for the armed police, they are responsible for maintaining order on the scene. Suspicious elements are handed over to the police to arrest and detention. Criminals who intend to sabotage or cause trouble are arrested by the armed police. The rebellious clergy can be shot and killed directly.

With the close cooperation of the three, although I dare not say that the water is not leaked, at least from the surface, criminals with ulterior motives will never be able to take advantage of the situation.

Generally, shelters are so tightly defended, and even more so in the shelter where the city government is located.

As the current location of the municipal government office and the resident of the joint investigation team, the soldiers transferred from Xingcheng of the joint investigation team are stationed at the municipal government, so the review and defense at the gate of the municipal government are one level higher than other shelters, even though a fly cannot fly in, although there are no flies now.

However, although the review of entering and leaving the shelter is very strict, if you don’t come out and just stand at the door of the shelter to smoke, it is relatively easy and simple.

Because of the closed relationship inside the shelter, it is very troublesome to smoke.

After all, if smoke in a closed environment and the smoke cannot dissipate, it will leave a very unpleasant smell. Smoking in a shelter can easily cause safety hazards such as fires.

Therefore, smoking inside the shelter is prohibited, but cigarettes themselves are not prohibited. They just need to come to the door of the shelter to smoke in a place with better ventilation.

Considering that life is under great pressure in a doomsday environment and there are many people who are addicted to smoking, each shelter has specially set up a small area at the door as a smoking place.

But the so-called smoking place is just a corner of the wind. Although there is no cold wind that will roll up the ice and snow and slap it on the face, smoking a cigarette while standing is basically the limit. If you stand in such a place for a long time, your feet will not lose consciousness, but will be frozen in the physical sense.

However, for smokers, it is a rare pleasure to be able to smoke a cigarette in this current environment. Although the cigarette is expensive, it costs a lot of food and supplies to go to the black market for exchange, or have enough contributions and labor points to get a very rare pack of supplies issued by the monthly shelter.

This is naturally the case for officials who have just finished the meeting in the city government, especially the boredom and brain power consumption brought by the long meeting. A cigarette can indeed refresh the mind.

Although they are not lacking in smoke, they still have to abide by the regulations to come to the smoking area at the door.

Because the smoking room is located in the inspection post at the door, the police and armed police in charge of the inspection just looked here and did not pay much attention, so the staff were even more unlikely to offend their superiors.

As a result, there were a few smokers standing smoking at the door of the city government shelter.

"Fortunately, I still have a cigarette, otherwise I wouldn't be able to withstand the meetings." The person who spoke was a little rich, with a little Star City accent when he spoke, indicating that he was from the provincial government.

A city official who was also smoking next to him couldn't help but echo: "Who said it was no! In this environment, I have to lose a few cigarettes, otherwise people would not be able to withstand this addiction."

Several officials took advantage of the break during the break during the meeting to smoke. At this time, everyone did not care about their identities or the difference between provincial and municipal governments. The few people chatted about the topics related to cigarettes.

However, a cigarette did not burn for a long time, and the break between the meeting was not long. Soon, a few people finished smoking the cigarette in their hands and prepared to go back to the shelter to continue the meeting.

But one of them fell behind and seemed to not want to go in.

This behavior naturally attracted the attention of others, and one of the officials asked: "Secretary Li, aren't you going in yet?"

"I'll go in after smoking this cigarette." The person who was shouted raised the cigarette that was only half smoked in his hand and smiled.

The person who asked him naturally understood it very well. Now it is not as valuable as before. A cigarette is very precious. Naturally, it is impossible to extinguish it after smoking it halfway.

The other officials did not ask much. A group of people who had finished smoking returned to the shelter one after another, leaving only Secretary Li who was still smoking.

However, the effort of half a cigarette was very short. When the others were about to leave, Secretary Li was almost finished smoking the cigarette in his hand.

After smoking his last two cigarettes, he threw the cigarette butt into the trash can beside him.

But just when Secretary Li was about to go back, he found that the shoelaces on his feet were dispersed, so he squatted down and tied his shoelaces again.

Secretary Li finished tying his shoelaces and then stood up and walked into the shelter. When he met a cleaner who came to clean the sanitation, he nodded politely, saying hello.

The cleaner also greeted Secretary Li politely. After he passed, he came to the smoking place where a bunch of officials had just smoked, swept the cigarette butts on the floor, and poured the things in the trash can into his bag.

There was nothing suspicious about this, so neither the police nor the armed police at the door paid attention to this side. They focused more on the outside of the shelter and looked vigilantly at everyone entering and leaving the shelter.

However, no one noticed that when the sanitation worker put the trash can back, there was already a note in his hand.

The sanitation worker cleaned the ground and then walked back to the shelter with his bag filled with garbage.

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In Chen Xin's shelter, Chen Xin quickly drew the design of the snow track wheel.

The connection between the snow track wheel and the wheel is still a problem, but after thinking about it, Chen Xin decided to add a chain to the bottom of the car and a fixed rod to the wheel hub to add a fixing point. In addition, the clips on the wheels together fix the snow track wheel to the wheels so that it will not slip.

As for the fact that it is easy to remove it without any need, you just need to untie the fixing rod on the hub and the chain at the bottom of the car, then fix the snow track wheel, and pull the wheel out of the snow track wheel.

Chen Xin looked at the drawings he drew and felt that it should be almost the same as the original. Even if there are some differences in structure and details, it is still a small matter.

The next question is of course how to make this thing, and parts processing is naturally not a problem. With the system, Chen Xin can easily get the parts he wants, but he still cannot make the footprint without rubber.

Rubber was a very common industrial material before the disaster, and various rubber products also filled people's lives.

As an important industrial raw material, whether it is natural rubber raw materials from Southeast Asia or chemical rubber obtained through petrochemical technology, it is very easy to obtain before the disaster.

But unfortunately, now after the disaster comes, it is difficult to obtain rubber.

In addition to the rubber raw materials left before the disaster, natural rubber probably is gone. After all, even if those rubber trees have not been burned, now that the world has entered the ice age, those rubber trees have lost their growth environment, and no one has cut rubber.

However, chemical rubber should still be able to be produced in the country. After all, this is a very important industrial raw material and needs to be used in all aspects. Even if chemical rubber is not as good as natural rubber, in today's environment, it is impossible to build a special planting greenhouse to grow rubber.

According to Chen Xin's estimate, the country should have retained some industrial facilities and oil wells before the disaster. With these preserved industrial facilities, production should have resumed after half a year.

However, nowadays, traffic in various places is in a state of half-cutting, and only railway transportation can still be carried. When the entire highway network is almost paralyzed, even if rubber is produced, it will be transported to the places where it needs the most without wasting precious production capacity and transportation capacity to non-key industrial cities like this city.

Although there are many large chemical factories in this city and are important industrial production enterprises, in the previous disasters, the chemical factories around the city were affected by fires, and it is difficult to count how many equipment can be retained.

After all, the chemical factory itself is a flammable and explosive place, which is something that Chen Xin, who grew up in a chemical factory since childhood, can be said to be very familiar with.

Therefore, the city now has almost no industrial foundation. Only the factory area under the city government can produce some materials needed for various shelters. Not to mention that these productions do not contain chemical rubber, even if they have them, Chen Xin can't get them.

So if Chen Xin wants to use rubber tracks, the only way is to get rubber products before the disaster, and use the system functions to extract rubber that can be used as raw materials.

The most suitable rubber product is naturally the tires.

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