After listening to the words of the technicians, Uncle Ding thought about it and felt that it was also the time when the external environment was not the peaceful era before the disaster, and if you hide in the mountains, you can hide for a month without a dragnet investigation, and the natural environment of extreme cold and lack of oxygen is enough to kill anyone.

It's like climbing Mount Everest or going to the North and South Poles before a disaster, without adequate preparation, professional protective equipment and enough warm clothing, all that awaits you is cold and death.

However, while watching the technicians install these biological reaction facades, Uncle Ding suddenly remembered his daughter Ding Ning and Mo Qingyan.

Although Uncle Ding, the shelter where Ding Ning and Mo Qingyan were, hadn't been to see it, Qin Lan knew everything about that shelter when he went there before, and he had reported to him when he came back, so Uncle Ding knew that they didn't have a greenhouse there, nor did they have any oxygen generation equipment.

Out of concern for his daughter, Uncle Ding asked the technician: "Isn't it troublesome to make a device like this yourself?" If a private shelter wants to have a similar device, can it be made? ”

The technician glanced at Uncle Ding in some surprise, as if he felt that the focus of the SWAT captain's attention was a little strange, but he still explained: "If you just make a similar simple device, it will not be troublesome, but the oxygen production efficiency and maintenance and cleaning of the equipment will be very troublesome."

If you want to produce oxygen in a private shelter, it is recommended to build a greenhouse, which can provide both food and oxygen if there is electricity and water, which is much simpler than getting a set of such oxygen equipment. ”

The technician's words made Uncle Ding's heart sink, and he was suddenly full of worries about Ding Ning and the others.

He had the heart to ask the technician if he had extra equipment, but when this word came to his lips, Uncle Ding swallowed it back.

The equipment in front of him was for the survival of more than 20,000 people in the entire shelter, and it was impossible for Uncle Ding to embezzle it for his own personal gain, even if he only needed a small part.

And instead of getting a set of equipment for Ding Ning and Mo Qingyan, the easier way is to let them move to the shelter.

This will not only solve their survival problems, but also provide security for them.

After all, no matter what, in the shelter of the police station, Uncle Ding, as the captain of the special police team, is more or less in charge, and Ding Ning's safety is still guaranteed.

After figuring out this truth, Uncle Ding didn't ask the technicians any more questions, and made up his mind that no matter what kind of emotions Ding Ning made this time, he would send someone to pick her up.

Big deal, I bowed my head and confessed my mistake to her.

Bow your head and apologize to your daughter, no shame.

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The official shelter has all the oxygen production equipment, but Chen Xin can only do it himself.

However, Chen Xin did not build another workbench, but borrowed the workbench attached to the weapon cabinet.

Although this is a workbench used to make and maintain weapons, it is equipped with all the tools, and the related auxiliary materials such as tape and glue are also quite complete, even if the tools are not too handy, it is not particularly difficult to transform the existing materials at hand and get a simple oxygen concentrator out.

Make a hole in the side of the plastic box, connect the pipe and the micro vacuum pump, and then connect a vertical pipe, set it on the screen window placed in the plastic box, ensure that the water flowing out of the tube can flow to the screen window, and then install a fill light in front of the screen window, this simple algae oxygen tank is completed.

Although this thing is terrible in roughness, the pipes are all sealed with tape and glue, and the pipes and screens lack support, and they are crumbling when they look at it, but in the judgment of the system, it is still a complete survival device.

"Rudimentary algae biooxygen tank"

"Upgrade plan 1: increase the algae attachment surface, improve the algae reproduction efficiency, oxygen production +10%, biomass production +5%, upgrade the required survival point 100"

"Upgrade Plan 2: Change the structure of the sink to increase the photosynthesis efficiency of algae, +15% oxygen production, and upgrade the required survival point by 80"

Seeing that the system provided an upgrade plan, Chen Xin was relieved, since this simple thing could be recognized by the system as an algae biological oxygen generator, then what he had to do next was to collect materials or directly use the survival point to continue to upgrade this oxygen generator.

From the two upgrade methods provided by the system, Chen Xin also judged that the two upgrade routes of this algae oxygen generator should be upgraded in the end, one should be to take the fuel cell route to become a biogenerator, and the other is to become a pure oxygen generator.

And the corresponding algae also seem to be different, the first is obviously more suitable for attachment and growth, and can recover a large amount of biomass for fuel cell conversion of electricity.

The second is a planktonic algae that is significantly more pelagic and aims to obtain more oxygen rather than recycle biomass.

While it is possible to choose between two options, Chen Xin clearly prefers the first option, as he needs to obtain biomass fuel cells to power the shelter.

After all, he still has a planting greenhouse that can provide oxygen, and he does not need to rely on an oxygen generator to produce a large amount of oxygen, which is only an auxiliary equipment in his planning.

It's just that the upgrade of this oxygen concentrator can't be carried out for a while, on the one hand, Chen Xinxin no longer has enough materials on his hands, and on the other hand, because the previous upgrade of the weapon cabinet and protective clothing has used up the survival points in his hands.

Considering that the current oxygen content of the atmosphere is not to the point where people cannot breathe, and he still has a greenhouse here to provide oxygen, Chen Xin is not very urgent about upgrading the oxygen generator.

And at this time, Chen Xin, who re-checked the information, also reacted that even if the surface and marine ecology all collapsed, and there was no sunlight for photosynthesis, the oxygen in the earth's atmosphere would be enough for humans to breathe for a long time.

Although the previous global fires and meteorite impacts consumed a large amount of oxygen in the atmosphere, the remaining oxygen is still enough for human beings to use for a long time, and even enough to support the dust in the sky and the earth's ecology is rebuilt.

And according to Chen Xin's speculation and the data he found in the data on the computer, this completely dim situation in front of him will last for a year at most.

Although the dust in the sky still obscures most of the sunlight, the earth's surface may change from no light to a low-light environment within one to three years, and in the oceans, which occupy 70% of the earth's surface, algae can already photosynthesize to produce oxygen in a low-light environment.

In other words, human beings may face the problem of hypoxia caused by insufficient oxygen, but they will not be unable to survive due to lack of oxygen.

The existence of oxygen concentrators is only to improve the living environment of human beings in the shelter and make human beings live better.