The refining of air circulation magic weapons and filter chips is both very mature and reliable technology. Even as early as tens of thousands of years ago, people rode starships with air circulation magic weapons and galloped across the universe in the vacuum of the universe.

No matter how the war has destroyed the technology in the past ten thousand years, this most basic refining technology has never been lost. Even the Starry Confederacy on the border of the Star Sea has developed to the pinnacle. The super-large air circulation system in the Star 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 technical level of the real human empire is at least tens to one hundred years ahead of the Starry Federation, and it is naturally even more difficult to use many technologies in the field of air circulation.

Li Yao obtained a large amount of information about the imperial starships in the deep sea Dragon Palace of the Li Linghai, and had a profound study on the air circulation systems of these starships.

Even the heavy starship, which was refined hundreds of years ago and which is more than ten kilometers in length, still has no technical difficulties in its air purification, filtration and circulation system. With a little bit of highly concentrated "converter", the energy source continuously turns the waste gas into fresh air, and uses molecular-level "filter screens" to screen out various toxic substances. Even when a raging flame is ignited inside the starship and releases strong black smoke and poisonous fog, it will not affect the combat effectiveness of the entire starship.

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

This is not a big problem. Li Yao knew that several special ceramic materials, as long as a thin layer was sprayed on the surface of the component, it could greatly improve the heat resistance and shock resistance. The technology is not complicated and the cost is absolutely not high.

However……

In the core unit of the air circulation magic weapon used in area 10084, all purification chips and exchange units are rusty and strange in shape. Both the surface and the inner talisman arrays are crooked like children's smearing, and no heat insulation is performed at all.

Because it is running day and night and there is no good ventilation and heat dissipation system, the temperature inside the magic weapon unit is already extremely high, and even a light poke with a finger can poke a shallow pit.

Such components are not described as "short-made" at all, but are far behind the times. Even if they use the magic weapon component assembly line from five or even eight hundred years ago, they cannot refine such clumsy products. Who knows which small workshop did these things be refined?

It would be strange if the air in the town could be fresh with such a copycat. No wonder Li Yao smelled a dull and dirty smell from beginning to end!

Li Yao felt angry when he saw this, and even felt disgusting. A weapon refiner like him, seeing such shit-like magic weapon components, was simply defiling his eyes and heart. He suppressed his anger, straightened his waist, and shouted to the underground people outside: "Who bought these magic weapon components, and who installed them? Who bought them from? You are all fooled!"

Li Yao's voice echoed in the huge cave, shattered by stalactites and stalagmites, but did not cause any waves. The underground people who were originally hiding in stalagmites, mushrooms and bacteria fog and looked at them all quickly shrank their heads back like frightened four-legged snakes.

"It's useless, Brother Yao, stop shouting. Except for the very few specialized talents trained by Sister Long, others will not talk to us."

Li Jialing explained, "The underground people regard us all as cultivators, at least those who come down from very high ground.

"For thousands of years, the cultivators who came down from the ground have never brought any benefits to the underground people. On the contrary, they only bring slavery, destruction and disasters. Any place where immortals appear often means that precious mineral veins and relics are found there, which means that nearby villages will suffer!

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

"This is the cultivator who has learned countless lessons and heard that new mineral veins and remains were discovered underground, so he pretended to be friendly and came to the underground. He even sent a large amount of urgently needed materials under the banner of His Majesty's care for the ants and the major sects to provide free assistance. In fact, in order to explore the information about mineral veins and remains from the underground population.

"After the information was obtained, the coordinates and reserves were found clearly, the cultivators immediately turned against each other and completely destroyed the village. All the villagers were either silenced on the spot or exploited to death.

"This kind of thing has happened hundreds or thousands of times, and it will always leak out the news. Over time, all underground people know that talking to people on the ground will bring disasters. You must keep silent and stay away from it."

Li Yao frowned and said, "Aren't we the VIPs of the 'Forget-Wretched Heavenly Girl'?"

"It is precisely because we are Sister Long's VIP guests that they dare to take the courage to watch us, and that the maid can say a few words to us."

Li Jialing said, "Otherwise, once the ground people like us appear here, maybe everyone will hide in the deepest part of the cave and squeeze with the rock insects and shivering!"

Li Yao sighed, his eyes pierced through the thick fog again, and even pierced through the cold and hard shells of the underground people like rocks, as if he could sense the real fear, tension, confusion, and even a little... expectation under their cold appearance?

Li Jialing continued: "Actually, there is no need to ask them such a simple question. If the magic weapon components sold to them are not so clumsy and are broken in every few days, but are excellent or even qualified products used on the ground, which can be used stably for a long time, will there be no problem with the supply of oxygen deep underground?

"There is no problem with oxygen. There are also rock worms. Here we can be self-sufficient. How can we control five-digit towns like District 10084? How can we use a small can of compressed air to exchange dozens of rock worms and hundreds of rock worms?"

Li Yao was slightly stunned, his eyes gradually became cold.

Li Jialing smiled bitterly and said, "Relying on the omnipotent Brother Yao, after half a year of carefree and heartless life, I seem to go back to the past and fight Li Lingfeng, Wu Yinglan's intrigue and wits and courage, and every second it will stimulate brain cells to the limit. It's so... uncomfortable to see everything so clearly!"

Li Yao stopped talking, knelt in front of the air circulation magic weapon on one knee, narrowed his eyes slightly, and listed the materials in his Qiankun Ring deep in his brain, as well as maintenance and later maintenance plans.

Repairing the magic weapon for air circulation is really a piece of cake for a master like him who can even repair giant god weapons.

But Li Yao spent five minutes thinking, polishing the set of plans with the most cautious and meticulous attitude, and then he tried his best to temper all the magic weapons and components in an entire hour. The scrap copper and iron that was really unbearable was simply thrown away, replaced with the treasures he had cheated from Li Linghai, and at the same time, he was still extremely weak, and reorganized the entire circulation and purification system with the three-dimensional micro-carving method of molecular level.

As for the converting agent that converts carbon dioxide into oxygen, there is no finished product in his Qiankun Ring. Fortunately, the preparation is not complicated, and Li Yao did not frown for a long time. He used several priceless coolant and combustion aids to synthesize a bucket on the spot. With all residents in District 10084 and the consumption of rock insects, it should be no problem to support it for two or three years.

"Done!"

Li Yao looked at the bright and shining magic weapon component, smiled slightly, gently closed the cover of the core unit, and fine-tuned the operating talisman array next to it.

Suddenly, a fresh and cool air gushed out from the "towering trees" to the branches and roots extending everywhere in the entire town, just like a drizzle drizzle in a hot summer afternoon.

Many underground people have been spying on Li Yao's movements carefully from afar. They dare not come forward to stop him, nor do they know what he is doing. They only vaguely understood the general idea at this moment. They could not believe what their eyes and skin felt, but were dumbfounded and as dumbfounded as a wooden chicken.

They have been there for a long time, and perhaps for thousands of years. From the ancestors of their ancestors, they have not known the feeling of "ecstasy". The darkness and embarrassment of reality even forced them to accept Long Yangjun's "good intention" and gave up their emotions full of pain and despair.

But now, the long-clogged brain area suddenly stirred up, and their faces were stiff, twisted, and strange expressions, sweet, bitter, spicy and salty. Flowers bloomed hesitantly on the faces of men, women and old people. They were all staggering and dancing like drunk.

"Dear fellow villagers, I just repaired your air circulation system, gradually restored the oxygen content in the air to normal levels, and purified the poison in the air. You have been accustomed to living in areas with low oxygen concentration for a long time. The sudden increase in concentration will cause 'intoxication' phenomenon, but it will not affect you at all, and will only make you smarter and stronger. Don't be nervous!"

Li Yao straightened his back again, regardless of whether the underground people could understand his words. After understanding it, he believed him or not. He just shouted, "I found that the overall cooling system of this town also had many hidden dangers. After returning from deeper underground, I will definitely help you repair it. After that, I will write the complete maintenance and maintenance process into the "Operation Manual" and hand it over to you. In the future, you can repair and maintain it yourself. Believe me, it is not complicated.
Chapter completed!