Doomsday Bunker Upgrade

The drizzle has been falling, neither getting heavier nor about to stop.

Although the protective clothing has a good thermal insulation effect, Chen Xin still felt a little cool.

"Hu...hu..." Chen Xin's breath was a little rough. Although the protective mask can effectively block harmful components in the air, it also affects breathing.

It was fine before, but now with Chen Xin's breathing quickening after walking for a while, he felt a little breathless.

Chen Xin wanted to find a place to sit down and take a rest and calm down his breathing, but seeing the rain and mud everywhere on the ground, he decided to continue walking.

After all, it's just a little breathless. Chen Xin had a similar experience when he traveled to Shu before, just walk a little slower.

However, this also made Chen Xin wonder if he really lacked exercise as Qin Lan said. At that time, when he traveled to Shu, it was because of the altitude sickness caused by the high altitude and thin air that he breathed.

Could it be that his physique has really deteriorated because he has neglected to exercise in recent years as a professional online writer?

Chen Xin had such doubts, and couldn't help but wonder if he should get a human-powered generator and put it in the shelter. Stepping on the human-powered generator when he had nothing to do would not only generate energy, but also exercise his body.

But just when Chen Xin was thinking like this, he suddenly stopped and looked up at the sky.

The rain fell on the face screen of the protective mask, leaving unsightly stains, but Chen Xin still stared at the sky, at the thick dust clouds on the gloomy and dark sky.

"Damn it! It's hypoxia!" Chen Xin's brain is not stupid, he just ignored this problem subconsciously.

Who cares about the oxygen we breathe all the time? I'm afraid it's only when you're really out of breath that you realize you need oxygen, right?

When preparing for the construction of the shelter before the disaster, Chen Xin also subconsciously ignored this problem and only prepared oxygen cylinders in the shelter.

But now when he realized that he had encountered the problem of lack of oxygen, he realized that when the plants on the surface were destroyed by the fire and the sky lost sunlight, the air we were most accustomed to had become what we needed to survive. the biggest problem faced.

People need oxygen to live, and any activity of the human body also needs oxygen to maintain, and the more intense the activity, the more oxygen is consumed.

In the absence of natural plants for photosynthesis, atmospheric oxygen would gradually decrease as surviving humans deplete it.

This process will be irreversible unless the dust clouds in the sky dissipate and the sun shines again on the earth, allowing new plants to germinate for photosynthesis.

The surviving human beings want to survive, they can only find a way to generate new oxygen.

Chen Xin himself is not worried about this problem. There is a greenhouse in his shelter. Under the light simulated by the fill light, all crops will still undergo photosynthesis, which is enough to maintain his oxygen consumption at present.

As for the official shelter, Chen Xin felt that the country should have taken this issue into consideration. The only uncertainty is whether the country can solve this problem in a perfect way.

After all, what the country has to consider is all the survivors in the country, not the issue of a single shelter.

Common oxygen production methods include physical oxygen production and chemical oxygen production. Physical oxygen production is simply to collect oxygen in the air and use it where oxygen is needed; while chemical oxygen production is through chemical reactions, The oxygen in carbon dioxide or other raw materials containing oxygen is reduced to form new oxygen.

Both of these methods were widely used oxygen production methods before the disaster, but in the current apocalypse, these two methods are not so applicable.

Physical oxygen production requires a lot of electricity, and only extracts the original oxygen in the air. In the current environment where the oxygen content in the atmosphere is gradually decreasing, this method is not applicable.

As for chemical oxygen production, although it does not have the drawbacks of physical oxygen production, it also has the disadvantage that chemical oxygen production needs to consume chemical agents, and the cost is high, which is not suitable for large-scale application at all.

Therefore, if the Yan Guo government wants to solve this problem, it can only use methods other than these two methods to solve it.

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"Finally complete the mission!"

The SWAT team who completed the escort of the oxygen production equipment returned to the shelter under the police station, and everyone relaxed.

Although most of the SWAT team members did not know what the materials they were escorting were, but seeing the armored train at the railway station and the escort formation, they could guess that it was a very important material.

So when escorting this batch of materials, everyone was actually very nervous.

Now that the task was finally completed, everyone naturally breathed a sigh of relief.

The group walked to the area where the SWAT team was talking and laughing. Although the mission was not tiring, everyone was a little hungry under the high tension.

Although the food in the shelter is not very good, after completing the mission, it is a happy fact that there is something to fill the stomach.

However, because the food eaten in the shelter is mainly emergency food reserved before the disaster, although there is a canteen, it is actually only used to distribute fixed food, and there is no fire for cooking.

After all, fuel is precious these days, and cooking it is still a bit of a luxury.

As for the growing greenhouses that have started producing mushrooms, and the artificially raised mice and mealworms, although these foods have gradually begun to appear in the shelter's recipes, they have not yet reached the point where SWAT team members can only eat these. .

"By the way, what's there to eat today?" A SWAT team member hooked his friend on the shoulder and asked him.

"I think it was mutton with spring onions, and yesterday's was shredded pork in Beijing sauce. Why should we change the flavor today."

The companions responded to his words, it sounded as if the food was okay, but in fact they were all talking about the taste of self-heating food.

In the two months after the disaster, except for mushrooms and mouse meat, everyone has not seen fresh food for a long time.

Another SWAT team member interjected: "I think there should be cabbage soup today, no matter what. We came back with a box of cabbage yesterday! A whole box of fresh cabbage!"

"No! It was me and Zhuzi who carried it together, but it weighed two hundred catties!" When a SWAT team member who also carried the vegetables yesterday said about the cabbage, his eyes lit up.

Not everyone knew about the news of fresh vegetables. When they learned about it, many SWAT team members cheered excitedly: "Oh oh oh! I haven't smelled cabbage for two months!"