Blue Star World, Fragmented City.

The location of the underground factory reported by the robot An An was not far from the location of the half of the mountain that Xu Ran had searched before, and there was a dry riverbed nearby.

However, An An controlled the tour bus and did not go that far for the time being, and he took Xu Ran to a collapsed building about a kilometer away from the central building.

Half of the building is in a state of collapse, and the other half has been cleaned by industrial robots, and it has been propped up with large stone pillars to prevent further collapse, and an open area has been opened next to it, which can be driven by car.

On the way, Xu Ran asked An An why he still had about half of his energy.

An An told Xu Ran that after activating and opening the two industrial robots and consuming a lot of energy to crack the artificial intelligence self-destruct program of the industrial robots, in fact, his own energy had been exhausted, and he still used the two car batteries that Xu Ran left in the fragmented city, as well as gasoline and diesel fuel, and used two small generators to replenish the energy, and only replenished half of the energy after all the resources were exhausted.

Of course, the two small oil-fired generators were found in the half-collapsed building.

Judging from the layout of the building, as well as the large number of packaged or unpacked materials left behind, this should have been a logistics and distribution warehouse in the past.

The warehouse is very large, and even if half of it collapses, the area of the other half is about 1,000 square meters.

Xu Ran took the tour bus into the other half of the warehouse, and the tour bus did not stop, until it drove to a corridor staircase leading to the basement at the end of the road that had been cleared.

The staircase was a ramp, and a door at the bottom had been opened, and the tour bus drove straight down.

It was a little dark inside, and after the lights of the tour bus were turned on, Xu Ran could see clearly that the basement of this warehouse was also very large, and there were still a lot of materials piled up inside.

A wide road was also cleared in the middle of the stacked supplies, and the tour buses were able to continue moving.

All the way to the far right of the basement, there is also a ramp leading to the underground facility, but there are some defenses there, and there are some construction equipment and equipment piled up next to it, indicating that the underground shelter must have been built before the disaster.

The entrance to the underground shelter is not as narrow as the imaginary cellar that can accommodate one or several people in and out, but it is very open, and the width and height that can accommodate two heavy trucks driving side by side are still relatively spacious.

Because it was all cleaned up, the robot An An drove the tour bus all the way unimpeded, and drove directly into the entrance of the underground shelter and entered a wide passage.

It was dark inside, but it spiraled to the underground, like a road around the mountain, coiling one ring after another.

However, according to some traces of the disaster, it is estimated that before the disaster, there were cracks in the earth due to earthquakes, and humans took advantage of these cracks to build underground shelters.

Xu Ran calculated the depth, about 875 meters underground, that is, he reached the end of the passage, and at the same time, he officially entered the underground shelter.

After turning on the searchlight and scattering the light, Xu Ran saw that the space area of this underground shelter was very large, and he could hardly see the end of this dark underground space.

At the same time, the temperature in it is only a little higher than the surface, and it is not unbearably hot as imagined.

The tour station stood at the passage platform, and Xu Ran turned his face and saw that there was a large elevator, but because there was no power and energy supply, the elevator could not be used.

Next to the elevator entrance, there is a huge plaza with about seventeen sealed heavy trucks parked side by side.

However, there was also a power grid and guardrails in that area, and Xu Ran didn't quite understand why he was getting those unnecessary things.

Ignoring these for the time being, An An drove the tour bus and continued to drive deeper into the underground shelter.

Even underground, the road is relatively wide enough to accommodate two cars running side by side.

You can see that both sides of the road are excavated after the rock layer has been cleared, and the natural stone wall is used as a wall, making it look like a house, and you can see through some daily living facilities left by human beings inside, which were once inhabited.

Xu Ran passed all the way, and he could see that the space like houses on both sides of the road was very dense, and there were a total of nine such roads in the entire underground shelter.

If calculated by such an even distribution, this large underground shelter will probably be able to accommodate nearly 10,000 people living here.

In fact, it is similar to Xu Ran's guess.

After driving the tour bus around five connected roads, the robot An An also had a general understanding of this underground shelter the size of a large and medium-sized town.

Of course, this large underground shelter does not contain any human or animal bones or anything other than those that are left behind that do not contain water molecules.

However, through the beam of the searchlight, Xu Ran vaguely spotted a house-like facility in the innermost part of the shelter, which seemed to be a checkpoint, with an extremely thick and sturdy metal gate.

Such a metal gate, with extremely high thickness, is still electronically intelligently controlled, and I am afraid that if it is bombarded with missiles, it is estimated that it will not be able to break through.

Xu Ran was very curious about such a facility, so he asked An An: "What kind of place is there?"

An An replied: "Boss, after scanning, there is still a deeper shelter space that is separated separately, and the facilities inside are much more elaborate than outside!"

After saying something, Xu Ran immediately understood what kind of place it was.

There is even such a special place in the underground shelter, needless to say, it is naturally prepared for those powerful people, so there is no need to doubt it.

It's just that the metal gate is in a closed state now, and it is estimated that An An came with two industrial robots, and even if he uses violence, there is no way to break it.

After all, just looking at the metal gate will make people feel how heavy and strong it is, and they can only find a way to make it open through an intelligent automatic control program after the power is supplied here.

After looking at this underground shelter, Xu Ran suddenly lost much interest in this place.

Because in the shelter, there was nothing Xu Ran was eager to find, such as robots.

So Xu Ran's mind quickly flew to the underground factory where An An reported to him that there were still eight industrial robots, and said that he wanted to go and see it.

Xu Ran thought that he needed to get out of the shelter, and after going up to the surface, he would go to the underground factory near the riverbed.

But An An used practical actions to make Xu Ran realize once again that in addition to the advanced robot industrial manufacturing field known to Xu Ran, the construction technology level in the field of civil engineering also surpassed the earth.