"What are these?" In the central room of the air circulation duct of the police station's shelter, Uncle Ding looked at the pieces of things on the shelves in front of him, and asked puzzledly, "It looks like a glass plate?" ”

A technician who was debugging the equipment heard Uncle Ding's question and explained to him while continuing the work at hand: "This is the algae culture tank, and the standard name is the biological reaction façade......"

Checking the condition of a bio-reactive façade, the technician continued: "Of course, in terms of material, you can indeed call them glass plates, which are all made of plexiglass, and the inside of the façade is hollow, and after filling it with medium, it will propagate the algae with water and carbon dioxide. ”

Looking at the thousands of bioreactor facades in front of him, and more bioreactor facades were being installed, the manager of the city police station who was with Uncle Ding asked, "Can they be used to supply oxygen?" By these algae? ”

"Yes, by these algae." The technician nodded, and tapped his finger on a piece of bioreactor façade on the side: "These algae will be illuminated by the sun lamp to obtain the light energy needed for photosynthesis, and we will fill it with carbon dioxide through the pipe at the lower end of the façade to allow the algae inside to photosynthesize, and the pipe at the top will be responsible for collecting the oxygen released by these algae and feeding the air circulation system of this shelter." ”

"That's all it takes...... What façade of the creature? Another manager spoke, revealing a deep suspicion and distrust: "Can these things be used by 20,000 people in this vault?" ”

When this manager spoke, these managers of the city police department all had the same look on their faces.

It's not that these managers don't know how to pretend or look down on the technicians, but the thousands of glass panes installed here can supply the entire Vault with oxygen consumption, which does make one wonder if it can actually do it.

"These bio-facades are made using microalgae bioreaction to produce oxygen, and the Germans have done a similar technical experiment in the past, building a building house with an exterior wall built from this biological reaction, and the biomass produced by one of these bio-houses after the reaction provides enough heat and electricity to supply the needs of the three surrounding houses." Not surprised, the technicians continued to explain to the managers of the municipal police stations.

After all, it was a matter of life and death for more than 20,000 people in this shelter, and the technicians felt that they really needed to explain it more clearly.

"We improved this technology, and originally planned to use it on the submarine for experiments to see if it could be used as an oxygen supply system for the submarine to improve the time the submarine stays underwater." The technician did not hide the fact that this was originally a military experimental technology, but continued: "The efficiency of algae in producing oxygen is actually the highest among all living things on earth, and 70% of the oxygen on earth comes from marine ecosystems, so it is theoretically no problem to rely on algae to supply oxygen to the shelter."

As for whether the oxygen production can ensure the survival needs of 20,000 people, please don't worry, this system is designed to ensure the use of 30,000 people.

And although the oxygen content in the outside air will decrease, it will not be reduced to the point where humans cannot survive, but the oxygen content will be reduced to a level similar to that in the plateau area, and this system is mainly to prevent the deposition of carbon dioxide and the lack of oxygen in the underground structure of the shelter after the oxygen content drops. ”

The technician's explanation reassured the managers a lot, and several people in charge of logistics discussed something after listening to the explanation.

"Do you think the oxygen content in the outside world will not drop to the point where humans cannot survive?" When the technicians mentioned the problem of oxygen content in the outside world, Uncle Ding was particularly concerned, because the SWAT team is currently the department with the most field work in the police station, and he is very concerned about this problem.

The technician seemed interested in answering the question, pausing what he was doing and explaining: "The total amount of oxygen in the Earth's atmosphere is about 100 trillion tons, and a person breathes about 270 kilograms of oxygen per year.

Even at 0.3 tons, even if the Earth's 7 billion people were still alive, it would take 550,000 years to deplete the oxygen in the atmosphere, and it would take thousands of years to reduce the oxygen content by 1%. ”

Saying this, the technician laughed and jokingly added: "Of course, in practice this is impossible, even if the atmospheric environment is only reduced by one or two percentage points, it is enough to cause a hypoxic response in humans, and if the oxygen content in the atmosphere is less than 15%, it is enough to cause serious consequences."

Previous meteorite impacts and global fires have consumed a significant portion of the oxygen in the atmosphere, and it is estimated that the amount of oxygen in the atmosphere has dropped by about 0.5 to 1 percentage point.

In addition, there is no sunlight, photosynthesis is close to stagnation, there is no new oxygen production in the atmosphere, and the oxygen content of the external environment can be maintained at about 18-15%, of course, depending on the region and environment.

However, in the shelter, due to the problems of the underground building itself, and only relying on the ventilation system for ventilation, the oxygen content will be lower than that of the outside world, and it is estimated that if there is no oxygen supplement inside the shelter, the oxygen content is likely to fall below 15%, and carbon dioxide deposition will be formed, resulting in hypoxia. ”

Hearing the technician's explanation, Uncle Ding nodded clearly, but his brows furrowed.

Whether the external environment can survive or not, the issues that SWAT teams need to consider when they go out into the field are completely different.

If the external environment cannot survive, the danger of the external environment will mainly come from the harsh natural environment, which can be improved by improving the protective equipment and safety measures of field personnel to ensure the safety of field personnel.

However, if the external environment can still survive, but the conditions are more harsh, it will undoubtedly be much more dangerous for field personnel who go out to carry out tasks.

In peacetime, there are still many crimes such as robbery and theft, and in the last days, with the weakening of the government's control over the city, even the inside of the shelter will breed crime, not to mention that the wild is now an area beyond the reach of the government?

The technician seemed to see Uncle Ding's worry, smiled and comforted him: "But you don't have to worry too much about this comrade, in addition to the lack of oxygen, the temperature in the wild will also seriously restrict human activities in the wild, the low temperature of dozens of degrees below zero, coupled with the lack of oxygen, not many people can stay in the wild for a long time in this harsh environment." ”