This is the second time Qin Chu'an has seen this swarthy little girl. Manju is not black, nor is she like a yellow race, and this kind of blackness gives people an inexplicable meaning.

But it's intriguing.

So Qin Chu'an looked at her, she also looked at Qin Chu'an, the two of them stared at each other, Chuan Wu was also beside him, and Hei Bu looked ahead, like a machine with power off.

His wheelchair was swapped out, supported by a core behind him, and several slender robotic arms stretched out from the tail keel, navigating all kinds of terrain with the light of an octopus. It is said that he is like this when he goes out on missions.

Qin Chu'an was very curious about his leg disease and eye disease, in other words, very curious about what role he could play under such conditions.

and Manzhu, who is simply an underage little girl, is still an adaptation student, and the academy actually asked several of them to go on a mission together. It's really incredible.

Could it be that the "friend" is broken, he wondered endlessly.

The three of them were on a meadow, an undeveloped part of the 12th Federal District. A grassland with no water source, and a low mountain range not far away, are already close to the national border. But federal satellites, as well as "friend" surveillance, are still all around. Heavily guarded.

It's clear and empty.

Suddenly, Chuanwu's ears moved. Because he can't see, his sense of hearing is more sensitive than others. Even Alice had a hard time hiding her whereabouts in front of him.

"Found a place." She changed into her combat uniform today. But Qin Chu'an found that their clothes seemed to be just simple body armor and were not equipped with any intelligent systems. He didn't even bring the special equipment of the law enforcer, he hadn't connected to the Internet for a long time, and his hands were a little itchy.

I don't know how Zhang Lingqiu is staying alone in the academy?

Between the grass, a secret passage appeared in front of the four of them.

"Just go on like this?" Qin Chu'an felt that this was too simple.

"It's the safest way." Alice's white face was a little gray, and her hair was tied up, as if it had been treated, and there was no trace of excess smell from her: "But the premise is that we can't bring metal, and weapons." That's why we want you to come. With that, she jumped down the passage.

"It's kind of a 'friend' sphere of influence here. So don't worry. The device behind Chuanwu made him walk on the ground. In this era, even if there is a leg disease that cannot be cured, there is no problem with giving eight more legs. Manju obediently followed behind, holding the corner of Chuan Wu's clothes with one hand. It was pitch black, but she showed no signs of fear.

"What the hell is down there?" Qin Chu'an was curious. For the Federation's underground facilities, including nuclear bomb silos and some underground cities, many details require higher clearance. He knew that the current drilling technology was very mature, but he still didn't realize what was waiting for him.

"Do you know the von Neumann machine?" Inside the passage, Chuan Wu's flat voice came.

"Self-reproducing machines?" Qin Chu'an also read a lot of books. This kind of conjecture hundreds of years ago, even now, many people probably think it is a fantasy. I had the impression that the Federation's development on Mars used something similar, but Qin Chu'an didn't understand what this had to do with digging the ground.

"There are several ways to dig the ground, the most common is to dig down from the ground, a big drill bit, knock knock." Maybe Chuanwu wanted to liven up the atmosphere and used onomatopoeia, but the tone made people want to laugh.

"Knock knock." Manju also chimed in.

"Most of the underground cities in the Federation were dug up in this open and honest way. Now there are also programs that are set up, and they are completely left to the 'friends', who just need to coordinate the resources. But the problem is, not everyone can do that. Chu An, what's around here? ”

Qin Chu'an turned his head, and Chuan Wu's finger pointed to the side.

"Border?"

"It's less than ten kilometers from the border, and further north, it's the big country. Hundreds of years ago, having an army on the border could eliminate almost all stowaways. But now, there are more ways to cross borders. One of them is the von Neumann machine. ”

"Does this really exist?" Qin Chu'an always thought that this was still a conjecture.

"It's time to show you more information." Alice walked in front, her figure hidden, and Qin Chu'an touched her buttocks several times: "Just like Chuanwu said, the Feng Neumann machine can indeed be used to dig the ground, although the efficiency is not high, but it is better to conceal." ”

From Alice and Chuanwu's mouths, Qin Chu'an gradually came into contact with some of the inside stories of this matter.

The current method of sealing the national border of the Federation is by relying on the military and by probes buried deep underground. Electromagnetic waves are unreliable, but vibration alone can cause great errors. The entire underground is as vast as the sky, and even "friends" have nothing to do about it at the moment. It can only be said that it is guaranteed that within thirty meters underground, no one and large mechs will pass through.

But if you have a heart, you naturally have a new way.

As long as a certain number of von Neumann machines are placed underground on the other side of the border, a large enough hole can be dug in a certain period of time. This kind of violent excavation, which does not take into account the influence of the strata, often leads to the collapse of the ground and is discovered. It is precisely because of this that the Federation knows that these things exist.

After arriving at the designated location, the von Neumann machine began to devour the metal and various elements in the surrounding soil, and when its own breeding requirements were met, the identical little robot would be created, and then continue to grow by devouring the metal.

The entire design has been improved, and the size of each part is microscopic, which makes it possible for the machine to grow. It can be said that they have truly designed a self-reproducing robot in the style of a human. If you don't set up a destruction program, these little things will soon spread all over the planet like cockroaches. Swallow your table and run out of your stomach another ugly little thing.

When the cavity is formed, the von Neumanns cease all activity, and they lie on the ground, covered in usable metal and dismantling building materials.

The room has been done, only the decoration remains.

As he spoke, the passage came to an end. I faintly felt a breeze blowing behind the door, and there seemed to be a large space inside.

Chuan Wu took off the device behind him, Qin Chu'an picked him up, and Alice opened the door.

Behind the door, there are many city buildings, and you can't see the end at a glance. The ceiling, which was originally rubble, seemed to be covered by projections, and the blue sky and white clouds were above Qin Chun'an's head. It is difficult to grow trees underground, so patches of angiosperms cover the tall buildings, and the greenery is pleasing to the eye.

When they walked out from behind the rocks and saw the flying machines speeding between the tall buildings not far away, Qin Chu'an couldn't believe his eyes.

Right under the nose of the Federation, hollowing out such a large area in a way that violates the law?

Funny?! How many people are there, it's already a small city, right?

It's certainly not a city planned by "friends", at least not in the crowded style of the 12th arrondissement. Man and nature, and machines, seem to be in such harmony that they should be considered one of the more comfortable areas in the Federation.

"This kind of action has probably been going on for decades, and it is now rare, but it is not because the federal government has increased its surveillance." Alice looked at this small city that can be called bustling, and her tone was full of helplessness: "It's that there is less suitable land, in other words, they are about to dig up all the land that can be dug on the edge of the Federation." ”

Qin Chu'an saw that on the rock wall behind him, there were many small holes for one person to enter and exit. The four of them stepped on the grass, and Qin Chu'an carried Chuanwu on his back and walked towards the city.

"This rock wall that encloses the city can detect metal and weapons, and it's good to go. Unlike the federal surveillance of 'friends', they have a special set of encryption measures to ensure that it is not discovered by 'friends'. But it doesn't work for people, and your privacy will be truly protected here. Alice stepped out of the meadow and was greeted by a wide walkway. The streets are very clean and spotless.

A flying machine stops in front of them, and the driver appears to know Alice. The academy also has a lot of dark lines here.

"But isn't that already what we've discovered?" Qin Chuan couldn't figure out this logic. Since they all know that this place exists, why not ban it, this is a federal territory.

"The problem is, there are so many people here. Many of them are legal citizens of the Federation. Alice's fingers brushed her blonde hair and looked out the window at the city. The entire space is at least sixty meters high, and many of the buildings reach up to the projection on the ceiling. The aircraft in it was as small as grit: "Moreover, the law enforcer can only rely on the decision-making of the 'friend' to act, and the 'friend' will not send the mission if he can't perceive it." So our people can only lurk here and provide it with reference materials. ”

When Alice enrolled more than twenty years ago, the city already existed. It hasn't been here for many years, and it looks even bigger.

It's not that the federation doesn't want to take care of it, but in fact, there are many places that make them anxious, including this city. Besides, the principal hasn't been back to school for a long time.

Headmaster. Thinking of the opportunity of this mission, even Alice had some heart palpitations. can hack into the server under the academy and snatch the permission of "friends", even if it is a message, it is enough to prove the terror of the power of the comer.

And the opponent, right here. Not in this city, but deeper underground.

A mechanical frame slowly appeared out of thin air between Qin Chu'an's hands, reassembling his "legs" for Chuanwu. If this gift is used properly, Qin Chu'an will be the humanoid self-propelled arsenal of their group. Alice has lived so long, and she has never seen such a rebellious ability.

Suddenly, the sound of gongs and drums sounded from the bottom of the stairs where they lived. Alice looked out the window and saw that the street next to her was lit up with red and green. A brightly colored dragon dance walked among them, and people applauded and cheered on the side, so it was not lively.

"It's ...... Eastern customs? Qin Chu'an leaned up and asked uncertainly.

"Easterners, Asians, are the most populous people in the city." Alice looked at the ugly, handmade dragon dance, and her face showed a hint of disdain: "You can really see the shadow of the Dongguo people everywhere." Hmph, make the Federation a miasma. ”