That night, Wu Yuan sat in a chair in his office, looking down at the documents that Wu Zhen had given him.

What is written on the document is about the dazzling achievements of today's search and rescue force.

Through the efforts of nearly 1,000 troops throughout the day, the ancient city base actually contained a total of 4,500 survivors of City E in 18 hours.

Of the 4,500 survivors, 1,900 were males, 1,100 were females, 800 were young girls, 400 were children under the age of 10, and 300 were over 60 years old.

Such a ratio made the two siblings, Wu Zhen and Wu Yuan, want to laugh out loud when they see it.

Standing in the current situation of the ancient city base, the proportion of the elderly population is small, which is an absolute benefit, and the proportion of children is also acceptable, that is, the number of adult men and women accounts for the majority, so that the base labor force increases.

At present, the ancient city base needs the injection of young labor force too much, and many tiring jobs must be solved by young labor force together, the elderly have no mental strength, and children cannot do coolie labor for a long time.

Therefore, the young population has become the backbone of the construction and development of the ancient city base in the early stage.

To have such data is what Wu Yuan and his sister Wu Zhen are happy to see.

Counting tomorrow and the day after tomorrow, there are still two days in total, Wu Yuan hopes that the search and rescue in these two days can still get similar data as today, of course, if the elderly population and young population are large, then there is no way, so they can only accept them one by one.

At least at present, the grain reserves of the ancient city base are still enough to support tens of thousands of people for a month.

While the search and rescue team was wreaking havoc in E City, Wu Yuan also sent a number of female ordinary people to form teams to collect supplies, all of which followed the search and rescue team and collected them in the places where the search and rescue team personnel swept.

Therefore, the search and rescue team also brought back a lot of food without any casualties all day today.

But this kind of food will be used up one day.

Thinking of this, Wu Yuan felt that it was time to organize personnel to plant corn and sweet potatoes.

As for the greenhouse, Wu Yuan felt that he had to build a few more.

Therefore, after flipping through the documents, Wu Yuan left the office and came to the science and technology research and development room again.

It's just that this time, after Wu Yuan came, he didn't see Hongmeng's figure.

While wondering where the Hongmeng people went, Wu Yuan's eyes were attracted by the words on the big screen.

I saw a large line of white font displayed on the screen, and the words written: empty. Gas. Artillery production drawings are developed.

This made Wu Yuan interested, stepped forward, clicked on it and checked.

After clicking on it, a detailed information screen pops up.

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【R&D】

R&D Project: Civilized Armament

Research Type: Level 2 Civilization Weapon

R&D content: empty. Gas. Cannon (basic energy sniper cannon)

R&D progress: 0.01‰

Applicable Civilization Level: Unlimited

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After browsing the information on the screen, Wu Yuan was shocked and didn't know what to say.

Empty. Gas. Cannon?

What a terrible weapon that sounds?

This technology R&D room can even get this out?

Empty. Gas. It's not that Pao Wuyuan hasn't seen it.

In the previous life, the human beings in the last days had already developed and dealt with air energy-type weapons. Gas. Cannons are one of those weapons.

The shape of this air-energy type weapon is no different from that of ordinary firearms, the only difference is that it fires a special ammunition that has been compressed and made with a high degree of precision, impact bullets.

The core of the production of this impact bomb is a professional equipment that can compress air, and a shell that can store compressed air.

These two things, in his previous life, Wu Yuan remembered that they were only developed in the fifth year of the last days.

I don't know how the professional equipment came about, but the material of the bullet casing is real white iron!

Where there is white iron, Wu Yuan can clearly remember the location.

But Wu Yuan wouldn't look for it, because he knew that even if he did, it would be in vain, and there would be no white iron at this point in time.

White iron is not so much a substance that was discovered by scientists later, but rather a sudden appearance on the earth after several years.

This is a very amazing point, in the past ten years, human beings did not understand how white iron appeared, but overnight, I saw that there were continuous white iron veins on mountains and roads around the world drilling out of the ground, rising to a height of ten meters.

Unlike green iron, white iron has a strong shaping ability, and it is better than a large number, and more or less green iron veins appear almost all over the world.

Therefore, after repeated deliberations and testing experiments, scientists made a white iron shell, and at the same time injected the impact energy that had been being developed but could not be completed because there was no carrier into the white iron shell, and finally made the impact bomb.

The power of impact bullets is not half a star stronger than ordinary firearms and ammunition.

Among the air energy type weapons, the one that is famous for its brutal lethality is ***.

Empty. Gas. The shape of the gun is the shape of the original powerful sniper gun.

The structure has not changed much, but in the barrel, a special soft material has been added to alleviate the explosiveness of the impact projectile and ensure that it does not explode.

The power of the impact projectile, once hit, is equivalent to being hit by Wu Yuan with a complete spiritual power bullet, and the human body will be blown to pieces.

This relies on the diffusion of the shock wave that explodes after the concentrated compression of the air is released, directly into the human body, and transmits the shock in the human body.

Because the human body cannot withstand such impact and shock, the muscles, muscles and bones will naturally be forcibly torn apart by the shock wave, resulting in the effect of the human body being blown apart.

The worst thing is that this weapon only needs a professionally trained ordinary person to use it without hindrance.

Moreover, this terrible gun, the impact bullet fired, even the body of the Chosen One is difficult to resist.

Once Wu Yuan had seen it with his own eyes, a level sixty god choice, without defense, was shot in the back by an ordinary soldier, and was blown into pieces of minced meat on the spot, and blood was spilled.

It follows that the empty. Gas. How terrifying is the power of the cannon.

Recalling the memories before his rebirth, Wu Yuan looked at the big screen again, and suddenly felt the hairs on his body stand up.

Unexpectedly, Hongmeng actually gave him a whole space. Gas. Cannon......

At this moment, Hongmeng pushed the door in, and after seeing Wu Yuan, he said, "How about it, Lao Tzu has already started to help you prepare the guy for the fight." ”

Wu Yuan turned his head and looked at Hongmeng.

"This empty. Gas. Cannon? Wu Yuan asked.

Hongmeng replied: "It's just a design drawing, the materials need to be made by yourself, and I plan to develop professional equipment for air compression at the same time." ”

Wu Yuan nodded and looked at the progress bar on the big screen.

Hongmeng is also looking at the big screen.