In the training room, he put on the protective clothing and buttoned up the protective mask on his face, and Chen Xin sorted out the equipment he wanted to bring.

Originally, Chen Xin planned to wait for Qin Lan to exchange supplies with him and ask her to bring the prepared oxygen concentrator to Mo Qingyan, but out of concern for Mo Qingyan, Chen Xin still decided to send her by himself.

The entire oxygen concentrator has been stuffed into the rear seat of the SUV and has also been tied up to make sure it doesn't roll just because it's round.

After all, this thing is made of glass, and if you bump it, it will break.

The equipment Chen Xin brought was still the flashlight and folding trekking poles that he used when he went out last time, but this time the pistol he was carrying was changed from the one he made himself to the pistol he exchanged from Qin Lan.

Originally, Chen Xin considered that he was going to the city and didn't plan to bring a gun, but after hesitating for a while, he still put the gun on his body, which was responsible for his own safety.

And in addition to these things, Chen Xin also brought a bottle of oxygen.

This is the bottled oxygen he had reserved before, the quantity is not much, and it will be gone when it runs out, but considering that the oxygen content outside is now reduced, there may be a danger of hypoxia, he still has a bottle on his body, so as not to be helpless in case of insufficient oxygen.

After sorting out the equipment, Chen Xin opened the door of the upgraded shelter and drove the car out.

Turning around and closing all the doors, Chen Xin set off on the road to deliver an oxygen concentrator to Mo Qingyan.

In the rearview mirror, the door of the vault is much more decent than before, no longer looking like a hole has been dug and the door has been buried to enter, but a sturdy gate reinforced with cement all around.

In fact, this is made of reinforced concrete, not just cement, although it looks a lot more conspicuous, but it is not without benefits.

Sturdiness is of course the most important thing, but in addition to the ease of drainage.

Although the main precipitation has turned to snow as the temperature gets colder, solid concrete floors are always easier to drain and easier to maintain than regular mud floors.

Driving towards the city, Chen Xin also had to turn on the car lights this time, instead of turning off the car lights as he did when he came out before.

Because the road has become a little damaged compared to when Chen Xin came out before, and with the rain in the past few months and meteorites falling from time to time, there are a lot more debris on the road than when he entered the city last time.

This made Chen Xin's speed slow down a lot, the car was equipped with an oxygen concentrator made of glass, and it was easy to bump and break if it was too bumpy, so in order to protect the oxygen concentrator, Chen Xin could only slowly pick a relatively smooth road surface.

When Chen Xin entered the urban area before, most of the buildings in the urban area were just burned to the ground, but the overall structure was still there.

But when he entered the city this time, Chen Xin clearly saw that some houses had collapsed.

It was a collapse caused by a meteorite impact, and over time, the dust and meteorite debris floating in the sky would gradually fall, and the larger the volume, the faster it fell, and now it is the larger pieces of debris that fall.

In a sense, this is also a good thing, as the debris keeps falling, the dust clouds in the sky will not be as thick, and after a year or two, the earth will gradually return to sunlight.

For today's human beings, one or two years to restore from no light to a low-light environment can already greatly improve the living conditions of human beings.

But it will be a long time before normal light is restored, and the years when this dust obscures the sky will last for at least a few decades, at least two generations.

As for the restoration of the earth's ecology to its original state, it will take even longer, and it may take hundreds of years for the earth's ecology to recover.

For the earth, this may be just a short moment, an insignificant moment in the earth's billions of years, although this moment has caused great damage to the earth's ecology, but for the whole earth, this is still insignificant.

It's just that for human beings, this is a doomsday catastrophe that lasts for several generations and affects the survival and development of the entire civilization.

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Arrived at the door of Mo Qingyan's house, Chen Xin still called her on the radio as before.

Compared with the last time Chen Xin came, Mo Qingyan's home has obviously undergone some reinforcement and transformation, there is an extra circle of barbed wire on the fence, and the iron door can also be seen to be reinforced, even the original doors and windows of the previous shop frontage have been nailed up, and the iron gate in and out of the backyard has been put on a simple barricade made of triangle iron and wood.

Although it is a little conspicuous, it can also be called a security guarantee, at least it is not so simple for someone to do something to Mo Qingyan's family.

After receiving Chen Xin's call, Mo Qingyan and Mo Qingxin opened the iron gate together, and only after removing the barricade did they signal Chen Xin to drive the car in.

After Chen Xin drove the car in, the Mo sisters quickly moved the barricade back to its original position and closed the gate again.

Still drove the car into the elevator like last time, and went down to the shelter with the Mo sisters, Chen Xin got out of the car and took off the mask on his face.

"Ingredients, your protective clothing is good! Where to buy it? Why didn't I see you wearing it last time? Mo Qingyan looked at the protective clothing on Chen Xin's body and couldn't help but show envy.

Although she also has protective equipment, it is obviously not as good as the protective clothing on Chen Xin's body, which is very professional at first glance.

And what she has is a protective mask, a tactical poncho and cut-resistant gloves, which is very different from Chen Xin's protective clothing that is almost from head to toe.

Hearing Mo Qingyan ask about the protective clothing on his body, Chen Xin lifted the hat on his head, and then replied: "I changed it myself, if you are envious of Long Niang, you can give me the materials, and I will help you change one too." ”

"Oooh! Are you actually making your own ingredients? Well done! What materials do you need? Go back and help me and Xiaoxin make one too! Hearing Chen Xin say that he could help make one, Mo Qingyan was not polite to Chen Xin.

Chen Xin nodded and agreed, just a protective suit, even if you need survival points to upgrade, it won't cost a few survival points if Mo Qingyan provides materials.

"By the way, this is an oxygen concentrator made for you, I told you about the oxygen problem before, and I was worried that you wouldn't be able to deal with it, so I made one for you." Of course, Chen Xin didn't forget the purpose of his visit today, opened the trunk of his car, and moved the finished oxygen concentrator out of it: "In the case of uninterrupted power, this machine is enough for you and Xin Xiaomei." ”