When, when, when.

The constant knocking sounds in the camp added a touch of popularity to the entire silent mountain forest.

These days, it seems that high-risk black disasters have been repelled. The red value concentration of the surrounding air environment has also dropped a bit, and there are many fewer ghosts. It seems that the red value concentration cannot support the recovery of so many black disasters in one go.

Peace and tranquility suddenly descended on the Black Wind Camp.

Yu Hong followed the edge of his cave and dug away from the mountain wall, carving out large square stones more than one meter long and wide.

These stones are about fifteen centimeters thick, not very regular and uniform, and weigh about half a ton.

But in front of Yu Hong, they were just like ordinary small stones. He grabbed them with one hand, one on each side, and stacked them all in the center of the camp.

In order to avoid the underground formation structure, Lao Zhou and Lao Li had already cooperated in advance to dig out the foundation to expose the black wind formation underneath.

At this time, the two of them were squatting on the edge of the large pit in the foundation, observing the structure of the Black Wind Formation buried underground.

Some silver-gray networks like plant roots are exposed in the black soil pit.

These networks are spread throughout the pit, sparse in some places, dense in others, and seem to have grown naturally. However, the linear structure of the network is made of a material similar to metal or rock, and it looks like an artificial product at first glance.

After the two of them saw the base of the Black Wind Protection Formation, they had been squatting here and discussing it for a while.

This man-made product aroused great interest in them.

Seeing Yu Hong coming, the two stood up.

"Boss, we almost have enough stones for the stone castle." Li Runshan pointed to a large pile of hundreds of square rocks on one side.

"Next, the stones need to be polished and leveled, and adhesives, such as cement suture glue and the like, are needed."

"There's nothing I can do about the adhesive." Yu Hong shook his head.

"Then let's just use the dry-laying method." Lao Li nodded, "The next project will be relatively large, but the dry-laying method cannot build a large stone castle."

"It's okay, we'll improve gradually in the future." Yu Hong nodded.

After getting the confirmation, Li Runshan took Lao Zhou with him, and the two began to measure the data with tools.

Yu Hong didn't know how to do these technical tasks, so he stood farther away. He looked at the outer hospital in the distance, where Dr. Xu was taking Nana to play on the swing.

A few days ago, at the begging of his daughter, Lao Li built a wooden frame in the yard, and then hung two ropes and tied them to the wooden boards, turning it into a super simple swing.

It all takes no more than twenty minutes.

This guy's handwork is really good. He worked so quickly even though he was injured.

Ahem...

Suddenly there was a slight coughing sound.

It's Dr. Xu.

Yu Hong frowned and looked at Xu Ruoying who was pushing Aisena on the swing.

Her face turned pale, she covered her mouth with one hand and kept coughing.

"The weather is getting colder and colder. It is necessary to add more heating equipment, otherwise it will be troublesome if you get sick from the cold." Ding Shao came closer and whispered.

She buried Yao Feiling outside the sub-safety zone, under the largest and thickest old tree. Then she carved her name on the trunk as a tombstone.

After several days of recovery, she is now able to slowly walk around in the outer courtyard of the camp. But because she is not an official member, she can only still live in the wooden shed.

Heating equipment...

In fact, Yu Hong has already made preliminary arrangements.

He did not speak, but looked at the entire inner courtyard of the camp.

The water cooled by the nuclear power plant can be completely used as waste, and the heat will be circled around the camp to form a warm and constant temperature structure. Just the dissipation of heat will eventually cause other black disasters. Once the stone castle is initially built, apply an insulation layer , if you do a good job of concealing the symbols, there will probably be no problem.

Hearing Dr. Xu's cough, he turned his eyes and looked at the small cave No. 2 on the other side of the breeding house.

Instead, you can first introduce the cooling water into Cave No. 2 to ensure the temperature of the breeding box. Then bury it directly underground into the inner courtyard of the camp to ensure a basic temperature." Mushrooms and cockroach lizards both need temperature guarantees. If they are too cold, they will Production plummeted.

After all, neither cockroaches nor lizards are self-heating, homeothermic creatures.

This is Yu Hong's plan. In the past few days, he has replenished the radiation grenade enhancements, so that Black Seal can start a new enhancement task again. After confirming his idea, he looked at Ding Shao.

"How long will it take for you to recover?"

"The medicine here is very effective. It will be better in about a week." Ding Shao said honestly. Yu Hong glanced at her abdomen in surprise, and he kicked her without any force.

It only takes a few weeks of rest to recover... Obviously, he once again confirmed that Ding Shao is a very good type among enhanced people. "Okay, I will prepare things for you then." He said solemnly. .

Little Stutter's appearance is easy to identify, and there is no problem with that. The main thing is that we can't be sure where she is now.

"Okay." Ding Shao nodded. She also knew that the fact that she could stay in this camp unconditionally for so long was already the buffer time Yu Hong had given her to recuperate. If it continued, she might really be kicked out.

After arranging the tasks, Yu Hong returned to the cave and closed the door. He pressed one hand on the wall and closed his eyes.

To strengthen the cave safe house, the nuclear motor cooling water pipe drainage outlet was strengthened into a network root structure, with the direction... Yu Hong simulated and imagined in his mind that the cooling water pipes were bent, bifurcated, and refined into thinner water pipes. The water pipes go deep down, covering the walls of the cave, and at the same time, they also cover the cave of the No. 2 breeding house next to it and the open space in the inner courtyard outside.

Should the cave safe house be strengthened?" Black Seal's inquiry came as expected. A black line flew out, and soon a dark red countdown appeared on the wall. It was 16:42.

The time is okay.

"yes."

After confirming that the countdown had started, Yu Hong entered the state of penance training.

Cough cough cough…

There was another coughing sound in the courtyard outside. This time it was not Dr. Xu, but Lao Zhou.

Yu Hong frowned, feeling a hint of urgency.

He glanced at the detector aside, which showed the temperature: 3 degrees.

Once the temperature comes up, it should be fine.' He thought to himself.

Time passed slowly and it was early the next morning.

The moment when the black mark strengthening ends.

More than ten centimeters deep underground in the entire inner courtyard camp, the soil suddenly blurred for a moment. The next moment, some neat black slender water pipes appeared.

Water pipes only as thick as a little finger are laid evenly underground in the inner courtyard.

The cooling hot water from the nuclear power plant began to flow out continuously along the new pipes, dissipating a large amount of heat into the cave and the inner courtyard camp.

Slowly, the temperature began to rise slightly.

Yu Hong walked to the door and looked outside through the viewing window.

After a while, Lao Li and others who were working on the construction were the first to feel the warmth. Li Runshan's eyes lit up, and he seemed to have thought of something and ran over quickly.

"Boss? It seems to be getting warmer outside?" There was a hint of speculation in his expression.

"Well, I did it. I used a construction robot to work underground and laid some cooling water pipes to dissipate the heat from the nuclear motor and keep everyone warm." Yu Hong nodded and replied.

"Construction robot!?" Lao Li's eyes lit up. "Can that be done...?"

"No, there is wear and tear. If we can do it ourselves, we should try our best to do it ourselves. Otherwise, it will wear out and the robot will be gone, and it will be uncomfortable when we need to use it in the future." Yu Hong made up a reason at random.

"Okay..." Lao Li felt that it was really wise for him to follow Yu Hong. Listen, construction robot!

Too high-end!

In his entire life, he had only heard of such high-tech gadgets in the news from Silver Tower.

Lao Li took this news and passed it on to others, which immediately caused a burst of cheers from everyone.

The cooling of the temperature has become a problem that everyone is concerned about recently.

It's so cold that everyone dislikes going out less and less, and they all hide in the house, relying on windshields and quilts to keep warm.

It's better now. The campground is slowly warming up, and we don't have to worry about getting sick from the cold. We can go out and move around freely.

With such a big problem solved, everything should be fine in the future.

Yu Hong thinks so, and so does Lao Li.

It's just that... on the second and third days, everyone in the camp, except Yu Hong himself, began to cough.

"Something's wrong!"

Yu Hong had just gathered his sixth inner energy, and before he could be happy, Yu Hong frowned due to the coughing sounds one after another.

He came out of the cave and walked on the ground in the inner courtyard, feeling that the temperature in the camp was obviously higher.

"boss."

Li Runshan and Zhou Xueguang were discussing something under the lamppost. When they saw him coming out, they quickly came closer.

"Boss, I'm afraid we are in trouble." Li Runshan looked serious. After saying that, he couldn't hold it back and coughed a few times. "Isn't it a cold?" Yu Hong asked.

"No, it's pure pharyngitis. Doctor Xu concluded that it should be a problem with the air." Li Runshan replied.

"Air...is there an air purifier in the camp?" Yu Hong asked in a deep voice. Last time Lao Li brought back so many small appliances, they were all divided among themselves, and he didn't bother. "No, the core of that thing is to replace it."

There are no consumables, and even a machine is useless, so I didn’t take it." Li Runshan regretted it somewhat.

"And we can't be in an isolation space now. Even if we use an air purifier, we don't know if we can isolate this source of coughing." Zhou Xueguang coughed and added. "...Old Li, speed up building the stone castle.

Okay. Let's hide in so that the air can be filtered. The premise is that the cough is really caused by the air." Yu Hong continued.

He suddenly felt very tired.

This world... I originally thought that there was only black disaster. As long as we kept getting stronger, we would be able to stabilize after resisting the black disaster. Now there are problems with the air again... one after another...

He suddenly wondered what the future of humanity in this world would be like in such a desperate environmental change. In this way, just to live purely, he needed to do his best.

"First of all, we need to determine what is in the air that causes the cough. I will test this." Yu Hong sighed. "Alas..." Lao Zhou sighed and said nothing more.

"Dr. Xu used a breathing valve. After filtering the breath, the coughing was significantly relieved, so she was sure that there was some kind of floating matter in the air that caused us to cough." Li Runshan said. "Then use the breathing valve, and I will check the rest.
Chapter completed!