While Chen Xin was thinking about how to make snow track wheels, the atmosphere in the urban area became increasingly tense.

Although the wind and waves are calm on the surface, in fact, under the surface calm are monstrous waves that are ready to start.

At the entrances of the major evacuation shelters, there are strict checkpoints set up by the city administration, the police, and the armed police, and everyone entering and leaving the shelter is strictly checked.

Administrators are responsible for conducting identity checks to ensure that the identity of each person who enters or exits the shelter gate is well documented and that they have a shelter residency certificate and pass issued by the city.

This is a management system that was implemented after the disaster, although there was also a pass and residence permit system before, but the control was not very strict, just like the ID card before the disaster, many people usually do not even carry it with them, but if you want to strictly check it, everyone must have it, and you can match the number.

The armed police are responsible for maintaining order at the scene, handing over suspicious elements to the police for arrest and detention, and for criminals who intend to cause sabotage or trouble, the armed police are responsible for arresting and arresting criminals who intend to cause sabotage or trouble, and the clergy who resists can be shot directly.

With the close cooperation of the three, although it is not possible to say that there is no leakage, at least on the surface it seems to be orderly, and it is absolutely impossible for criminals with ulterior motives to fish in troubled waters.

Ordinary shelters are so tightly guarded, and even more so is the shelter where the city hall is located.

As the current location of the city government's office, it is also the station of the joint investigation team, and the soldiers transferred by the joint investigation team from Star City are stationed here in the city hall, so that the inspection and defense at the entrance of the city hall is even higher than that of other shelters, to the point that not a single fly can fly in, although it is long gone now.

However, although entering and exiting the shelter is very scrutinized, it is relatively easy and easy to stand at the door of the shelter and smoke a cigarette if you don't come out.

Because of the closed nature of the shelter, it was a hassle to smoke.

After all, if you smoke in a closed environment, if the smoke does not disperse, it will leave a bad smell, and smoking in an evacuation shelter can easily cause fire and other safety hazards.

Therefore, smoking inside the shelter is prohibited, but the cigarette itself is not banned, but if you want to smoke, you need to come to the door of the shelter and smoke in a well-ventilated area.

Considering the high pressure of life in the apocalyptic environment and the fact that there are many people who are addicted to smoking, each shelter has a small area at the entrance as a smoking area.

It's just that the so-called smoking place is just a corner by the wind, although there is no cold wind to roll up the ice and snow and slap it on the face, but standing and smoking a cigarette is basically the limit, standing in this kind of place for a long time, the two feet are not unconscious, but will be frozen in the physical sense.

But for smokers, it is also a very rare pleasure to be able to smoke a cigarette in the current environment, even though the cigarette is expensive, and it costs a lot of food and supplies to go to the black market, or if you have enough contribution and work, you can get a rather rare pack from the supplies distributed by the shelter every month.

The same is true for officials who have just finished a meeting in the city hall, especially the boredom and mental exhaustion of a long meeting, and a cigarette can indeed have a refreshing effect.

Although they are not short of cigarettes as management, they still have to follow the rules to come to the smoking area at the door.

Since the smoking area is located inside the checkpoint at the entrance, the police and armed police in charge of the inspection only glance here and do not pay much attention, and the staff are even less likely to offend their superiors.

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

"Fortunately, I still have a cigarette here, otherwise people really can't stand this continuous meeting." The one who spoke was a slightly wealthy official, speaking with a slight accent of Star City, indicating that he was from the provincial capital.

A city official who was also smoking on the side couldn't help but echo: "Who said it wasn't! In this environment, there are still a few cigarettes to smoke, otherwise people will not be able to bear this addiction. ”

Several officials came out to smoke during the break in the middle of the meeting, and at this time, everyone did not care about their status or the difference between the provincial government and the city government, and several people chatted about cigarette-related topics.

However, a cigarette did not burn for long, and the interval between the breaks in the middle of the meeting was also not long, and soon several people finished their cigarettes and prepared to continue the meeting inside the shelter.

It's just that one of them is left behind and doesn't seem to want to go in yet.

This behavior naturally attracted the attention of the others, and one of the officials asked, "Secretary Li, don't you go in yet?" ”

"I'll finish this cigarette before I go in." The man who was shouted held up the half-smoked cigarette in his hand and smiled.

The person who asked him naturally understood very well, now that a cigarette is very precious, it is natural to smoke it, and it is impossible to extinguish it after half of it.

The other officials didn't ask much, and a group of people who had already 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 also very short, and by the time the others were almost gone, the cigarette in Secretary Li's hand was almost finished.

He smoked his last two puffs and tossed the cigarette butt into the trash can on the side.

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

After Secretary Li finished tying his shoelaces, he stood up and walked to the inside of the shelter, and when he met the cleaner who came to clean up, he nodded politely, which was regarded as a greeting.

The cleaner also politely greeted Secretary Li, and after he passed, he came to the smoking place where a bunch of officials were smoking, swept the cigarette butts on the ground, and poured the contents of the trash can into his bag.

There was nothing suspicious about this, so the police and armed police at the gate did not pay attention to this side, they paid more attention to the outside of the shelter, vigilantly watching everyone entering and leaving the shelter.

However, no one noticed that when the sanitation worker put the trash can back, he already had an extra note in his hand.

The sanitation worker cleaned the floor and walked back to the shelter with his bag full of garbage.

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In Chen Xin's shelter, Chen Xin's design of snow track wheels was quickly drawn.

The connection between the snow track wheels and the wheels 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 hub to increase the fixing point, plus the clips on the wheels to fix the snow track wheels on the wheels so that they will not slip.

As for saying that it is not necessary to remove it, it is also simple, you only need to untie the fixing rod on the wheel hub and the chain under the car, and then fix the snow track wheels, and pull the wheels out of the snow track wheels.

Chen Xin looked at the drawings he had drawn and felt that they should not be much different from the original, even if there were some differences in structure and details, they were all small things.

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

Rubber was a very common industrial material before the disaster, and various rubber products also flooded 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 was very easy to obtain before the disaster.

Unfortunately, now after the disaster, it is difficult to obtain rubber.

In addition to the rubber raw materials left before the disaster, natural rubber is estimated to be 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 gone to tap.

However, chemical rubber should still be produced in the country, after all, this is a very important industrial raw material, which must be used in various 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 estimates, the state should have retained some of the industrial facilities and oil wells before the disaster, and the preserved industrial facilities should have resumed production after this small half a year.

It's just that now the transportation is in a state of semi-cut-off, only railway transportation can still go, and the entire road network is almost paralyzed, even if the rubber is produced, it will be transported to the place where it is most needed, and will not waste valuable production capacity and transportation capacity to be sent to non-key industrial cities like this city.

Although there are many large chemical plants in the city, which are important industrial production enterprises, it is difficult to calculate how much equipment can be left in the vicinity of the city during the previous disaster, when the chemical plants around the city were affected by fires.

After all, the chemical plant itself is a flammable and explosive place, which can be said to be familiar to Chen Xin, who grew up in the chemical factory since he was a child.

Therefore, the city's industrial base is almost non-existent, and only the factory areas under the jurisdiction of the city government can produce a little of the materials needed for each shelter, and these products are not to mention that there is no chemical rubber, and even if there is, Chen Xin will not be able to get it.

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

And the most suitable rubber products are naturally tires.

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