The magic weapon of air circulation and the refining of filter chips are very mature and reliable technologies. Even as early as tens of thousands of years ago in the great dark age, people were riding on the starship with the magic weapon of air circulation and galloping in the vacuum of the universe.


    No matter how the war in the past ten thousand years destroyed the technology, this most basic refining technology has never been lost. Even the Xingyao Federation on the coast of XingKong has reached its peak. The super large air circulation system in XingKong battle fort is enough to provide tens of millions or even hundreds of millions of people with the freshest air at the same time.


    The technological level of the human empire is at least several decades to 100 years higher than that of the Xingyao Federation, not to mention many technologies in the field of air circulation.


    In the deep-sea Dragon Palace of Li Linghai, Li Yao got a lot of information about Imperial starships, and had a deep research on the air circulation system of these starships.


    Even for the heavy-duty starship with a length of more than ten kilometers, which was refined hundreds of years ago, there are still no technical difficulties in its air purification, filtration and circulation system. With a little highly concentrated "conversion agent", the waste gas can be continuously turned into fresh air, and various toxic substances can be screened out by molecular "filter screen", Even when the internal flame of the starship is blazing and the strong smoke and poison fog are released, the combat effectiveness of the whole starship will not be affected.


    The air circulation magic weapon used in the deep underground is slightly different from the same type of magic weapon carried by the Starship. It doesn''t pay much attention to the sealing, but it requires high temperature resistance and vibration resistance.


    This is not a big problem. Li Yao knows that several kinds of special ceramic materials, as long as a thin layer is sprayed on the surface of the component, can greatly improve the heat resistance and seismic performance. The technology is not complicated, and the cost is absolutely not high.


    However


    In the core unit of air circulation magic weapon used in 10084 area, all the purification chips and exchange units are rusty and strange in shape. The symbol array engraved on the surface or inside is crooked, like children''s clumsy painting, without any heat insulation treatment at all.


    Because of the continuous operation day and night, and the lack of good ventilation and heat dissipation system, the temperature inside the magic weapon unit is already extremely high. Even with a finger, you can poke a shallow hole.


    This kind of component is not "rough" at all. It is far behind the times. Even if we use the magic component assembly line 500 or even 800 years ago, we can''t produce such inferior products. Who knows in which small workshop these products are made.


    It''s no wonder that the air in the town can be fresh with such fake goods. No wonder Li Yao smelled a dull and dirty smell from the beginning to the end!


    Li Yao felt angry and even nauseous when he saw this kind of dung like magic weapon component, which made him defile his eyes and heart. He held back his anger, straightened up and yelled at the underground people outside: "who bought these magic weapon components and who installed them? Who did you buy it from? You''ve all been fooled


    Li Yao''s voice reverberated in the huge cave, smashed by stalagmites and stalagmites, but there was no spray. The underground people who had been hiding in the stalagmites, mushrooms and fungus fog, peering at them, all like frightened four legged snakes, quickly retracted their heads.


    "It''s no use, brother Yao. Don''t shout. Except for a few professionals trained by sister long, others won''t talk to us."


    Li Jialing explained, "the underground people treat us all as immortals, at least people who come down from very high ground.


    "For thousands of years, the people who cultivate immortals on the ground have never brought any benefits to the underground people. On the contrary, they have brought only enslavement, destruction and disaster. Any place where there are people who cultivate immortals often means that precious veins and relics have been found there, which means that the nearby villages will suffer!


    "Over time, the fear of the people on the ground is deeply imprinted in the flesh and bone marrow of the people on the ground. The only way for the people on the ground to resist is silence.


    "There have been countless experiences and lessons. When they heard that new veins and relics had been found underground, they pretended to be amiable and came to the underground. They even sent a large number of urgently needed underground materials under the banner of the emperor''s concern for the ant people and the free aid of the major sects. In fact, they wanted to get information about the veins and relics from the underground population.


    "When the information is available, and the coordinates and reserves are all clear, the immortal practitioners immediately turn their faces and completely destroy the village. All the villagers are either killed on the spot or squeezed to death.


    "This kind of thing has happened hundreds or thousands of times, and there will always be a leak. As time goes by, all underground people know that talking to people on the ground will bring disaster. They must keep silent and stay away."


    Li Yao frowned and said, "aren''t we the honored guests who forget to worry about tiannv?"


    "Because we are the honored guests of sister long, they dare to surround us and have a maid to talk to us a little bit."


    Li Jialing said, "otherwise, once the ground people like us appear here, maybe all of them will hide in the deepest part of the cave and shiver together with the rock insects!"


    Li Yao sighed, and his eyes pierced the thick fog again, and even the cold and hard crust of the underground people, as if he could feel the fear, tension, confusion, even a little expectation under their indifferent appearance?


    Li Jialing continued: "in fact, it''s not necessary to ask them such a simple question. Just think about it carefully. If the magic weapon components sold to them are not so bad, they will be broken in three days. Instead, they are superior or even qualified products used on the ground, which can be used stably for a long time, isn''t there no problem with the oxygen supply deep underground?


    "There is no problem with oxygen, and there are plenty of rock insects. They are completely self-sufficient here. How can the three digit and four digit towns above control the five digit towns like 10084 District, and how can they use a small can of compressed air to replace dozens or hundreds of rock insects?"


    Li Yaowei was stunned and his eyes gradually cooled down.


    Li Jialing said with a bitter smile: "after living a carefree and heartless life for half a year, relying on the omnipotent brother Yao, I seem to go back to the days when I was intriguing with Li Lingfeng and Wu Yinglan, fighting for wisdom and courage, and stimulating brain cells to the limit every second. It''s really... Uncomfortable to see everything so clearly."


    No longer talking, Li Yao knelt down on one knee in front of the air circulation magic weapon, his eyes narrowed slightly, and listed his own materials in the universe, as well as the maintenance and later maintenance plans.


    It''s a piece of cake for an expert like him, who can repair even giant soldiers.


    However, Li Yao spent five minutes to think about it and polished the whole plan with the most careful and meticulous attitude. Then, he tried his best to refine all the magic weapon components for a whole hour. All the useless copper and iron that could not be used were simply discarded and replaced with the natural materials and local treasures that he had cheated from Li Linghai, At the same time, he did not hesitate to consume the still extremely weak spirit, and reorganized the whole cycle and purification system with the molecular level three-dimensional micro carving method.


    As for the conversion agent for converting carbon dioxide into oxygen, there is no finished product in his Qiankun ring. Fortunately, the preparation is not complicated. Li Yaomei does not wrinkle his head. He used several valuable coolants and combustion aids to synthesize a bucket on the spot. With the consumption of all residents in 10084 district and the consumption of rock insects, it should not be a problem for two or three years.


    "Done!"


    Looking at the shining magic weapon component, Li Yao smiles, gently closes the cover plate of the core unit, and fine tunes the nearby Rune array.


    Suddenly, a fresh and cool air gushed out from the branches and roots of the "towering tree" extending to the whole town, just like a light rain on a hot summer afternoon.


    Many underground people have been carefully spying on Li Yao''s actions in the distance. They neither dare to stop him nor know what he is doing. Until now, they have a vague understanding. They can''t believe what they feel with their eyes and skin, but they are stunned.


    They have been for a long time, perhaps thousands of years. From the ancestors of their ancestors, they did not know the taste of "Ecstasy". The darkness and embarrassment of reality even forced them to accept long Yangjun''s "good intentions" and give up their feelings full of pain and despair.


    But now, the long dust laden brain region suddenly set off waves, their faces appeared stiff, twisted, strange expressions, sweet and sour, flowers in the face of men, women and the elderly hesitantly bloom, they are like drunk, staggering, hand dancing.


    "Fellow villagers, I just repaired your air circulation system, gradually restored the oxygen content in the air to the normal level, and purified the toxic substances in the air. You have been used to living in the area with low oxygen concentration for a long time. If the concentration suddenly rises, it will produce the phenomenon of" drunken oxygen ", but it will not affect you at all, It will only make you smarter and stronger. Don''t be nervous


    Li Yao straightened up again, regardless of whether the underground people understood him or not, and whether they believed him or not, but Gu arrogantly said, "I find that there are many hidden dangers in the overall cooling system of this town. After returning from the deeper underground, I will help you repair it. After that, I will complete the repair and maintenance process, All of them will be compiled into "operation manual" and given to you, and then you can repair and maintain them yourself - believe me, it''s not complicated.


    "But, to be on the safe side, you''d better choose two representatives with the most flexible brain and the strongest hands-on ability. Then I will teach them hand in hand first, and then they will teach them to everyone. In this way, you will no longer have to exchange the painstakingly bred rock insects for negligible compressed air, and you won''t have to be exploited by a higher level!"