It seems that my guess is correct, the structure here is really exactly the same as the underground structure of our small building over there!

Combined with the entrance to the black hole that Amy had just seen at the bottom of the Grand Canyon, I came up with a shocking conjecture, that is...... It's a huge building built underground, and the height is at least the depth of the Grand Canyon!

I looked at the height of the ceiling of the floor we are on now, which is more than three meters from the ground, which means that this underground building must have at least forty or fifty floors!

However, Wu Denghai quickly objected to my conjecture, saying that this underground building could not be so large, if there really was, it would cost a lot of manpower and material resources to clean and maintain, and it was impossible for him not to know, and it was estimated that the depth of this underground building was more exaggerated at most, and the cross-sectional area should not be too large.

I said in my heart that no matter what, I had to go down to find out, and then I remembered Amy, who had just gone down to the bottom, and said that if she couldn't contact us when she came back later, she would definitely be in a hurry, and she might not be able to come up without us pulling her.

I thought about it for a while, and decided to ask Hu Ziming to go out with the walkie-talkie and wait, and if Amy called, let Amy wait at the bottom of the valley for a while, and we would be out in an hour at the latest.

Hu Ziming nodded, and quickly climbed out with the walkie-talkie.

Then I asked Lin Hai and Wu Denghai to turn off their flashlights, and now they just follow my light source.

Here I want to talk about the flashlights in our hands now, these flashlights are not the flashlights that we got from the "ghost ship" at the beginning, but the military flashlights that we salvaged from the corpses of the Salvation Army, Amy said that this kind of flashlight must be charged with a special charger, which means that our previous method of charging with batteries does not work, so the power is a little less.

However, the beam brightness of this military flashlight is much stronger than the previous ordinary flashlight, and there are two protruding things at the front end of the flashlight, which can be used as a weapon to attack the opponent, and if the strength is enough, it can even directly paralyze people.

Therefore, although I asked them to turn off the flashlight, I still asked them to hold the flashlight in their hands, which can be used as a close-up blunt object, and secondly, it can also be used for emergency lighting at any time.

I went back to the room I came down from just now to confirm with Hu Ziming what I had arranged, and at the same time I noticed that the place we just came down was really not a normal entrance, it was just a rotten hole in the ceiling, probably caused by the black thing just now, now that I think about it, this thing can be regarded as a great favor for us, as long as it doesn't trouble us, then let it go.

Then I looked at the rooms on both sides of the corridor on this floor one by one, and there was nothing except some broken tables, chairs, and cabinets, and I could see that this place must have been emptied when the Bluebird Company evacuated before.

Then I took the sentry and walked down the staircase I had just kicked out, followed by Lin Hai and Wu Denghai and the sentry.

Lin Hai said that if the height of this underground building is really as deep as the Grand Canyon, then there must be an elevator, I nodded, but now it is clear that there is no electricity here, even if there is an elevator, we can't take it.

Soon down to the second floor, this is the same pattern, but the length of the corridor is much shorter, it seems that Wu Denghai just said right, although the scale of this underground building is not small, but it is not too large to the point of exaggeration, but I still don't understand what is the benefit of these buildings built underground.

Since the Bluejays dared to build conspicuous ground facilities in other parts of the island, and even hijacked cruise ships, it means that these people did not build the buildings underground to hide people's eyes and ears, and the most likely situation should be that the things they studied in this building could not see the sun, at least not for a long time.

In the same way, we quickly opened the doors one by one and checked them, and the doors were unlocked, and there were also those broken tables and chairs inside.

Besides, we didn't hear any noise, and the black thing must have gotten deeper.

After the second floor was searched, I still used the old method to grope around the wall for a while, and sure enough, I also found a hidden hidden wall, and after kicking it, another staircase appeared.

From the third floor, we decided to use Arabic numerals on the walls, for example, now that we are down to the third floor, we will have the word "3" engraved on the wall in many places, on the one hand, to mark the places we have been, and on the other hand, to help us remember the number of floors.

In this way, eight floors in a row, the height of each floor is the same, but the area is decreasing layer by floor, after reaching the eighth floor, all the floor area has stayed at about 200 square meters, and the number of rooms on both sides of the passage has changed from the original dozen to the current six rooms on each floor.

Some of the rooms here are starting to see something new, and that's broken pieces of glassware, all I can recognize are test tubes, beakers, evaporation dishes, volumetric flasks, and so on.

Are these people really experimenting here......

I've been keeping an eye on the Sentinel's state all this time, but it's not anything out of the ordinary, and I wonder if that black thing has already left the underground structure? After all, this thing is not very large, and it looks very good at burrowing, and it is not impossible to slip through other cracks.

We continued to walk down to the sixteenth floor, and just when I thought everything would continue to be the same, the shape of the seventeenth floor immediately "brightened our eyes......

And the structure of this layer is also very familiar.

Completely different from the shape of the previous floor, there is no corridor below, let alone rooms on both sides of the corridor, but a transparent hall of 300 square meters, and more than a dozen stone platforms like operating tables are evenly distributed in the hall.

That's right, these stone platforms are exactly the same as those on the fifth floor of our small building, and each stone platform has a ceramic stone table next to it, which is connected to the sewer pipe.

I started to look at it with my flashlight, but there was nothing on the stone platform, and I didn't see any dried blood, entrails, or anything like that I had imagined......

Seeing that there was nothing special about it, I decided to continue walking.

From this level, the staircase is no longer hidden, but appears directly on the north and south sides of the room, and is blocked by locked doors, but this is not difficult for me, and I can easily break through them by running a distance.

The seventeenth floor is also a hall structure, but there are no stone platforms, but some compartments divided by plywood, just like the office area in a normal company, and we really see a large number of papers printed with the watermark of "Blue Bird Company" on the ground, but these papers are blank.

What's more, the two doors connecting the staircase at the north and south ends of this floor are not ordinary doors, but ......

Security door.

And...... It's not your average security door.

There was something like a small phosphor screen next to the door, and I guess it would have lit up if it had been powered on.

I tinkered around for a long time and didn't figure out what this thing did, but in the end, Lin Hai recognized it, and he said it seemed to be an iris recognition system.

"What do you mean?" I asked.

Then I saw Lin Hai leaning down and turning his eyes towards the "fluorescent screen": "If there is electricity here, and your iris characteristics meet the permissions, this door can be opened." ”

I nodded, I seem to have seen this kind of thing on TV and books before, and the iris characteristics of each person's eye are unique, so unless the iris permission is obtained, this door will definitely not open properly.

But I didn't care, I said in my heart, isn't it just a broken door? I told Lin Hai and Wu Denghai to step back, and then they retreated a short distance, and after running up, they slammed sideways into the door.

Only a loud sound was heard after the door ......

Motionless.

Forehead......

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