Just behind this floodgate, what kind of existence will be sealed in the thick "black wall"?

In order to find the answer to this question, he drove into the "Dead City" alone, and now he really carried the necessary tools to the black and dark wall, and a fear of facing the unknown gradually appeared in Long Yun's mind, and the instinctive feelings of human beings would make him fearful, but this fear did not affect his actions.

Standing in front of the airlock with a width and height of nearly three meters, which can accommodate a car to enter and exit, lift the acetylene blowtorch in his hand and look around, with the diffuse light of the large blowtorch on the bracket behind him, the rough wall is flooded with a dull and dull metallic luster, and it is different from the last rough look in the dark.

Well, in this way, he should have been right when he last came.

This "black wall", the thick walls of metal materials in the huge building, was mostly built in a hurry.

The huge black wall that appeared in front of Long Yun's eyes, no matter how he looked up and down, left and right, the outer wall was all dull and rough with the same appearance, and on it were slightly messy casting marks, and thick welds like scars, as if these structures were all temporarily cast, and then welded together in a hurry. It looked like an ordinary scene, but Long Yun was secretly surprised, he only estimated by intuition that this oppressive "black wall" was extremely thick; Combined with the scale of almost twenty or thirty meters high, the thickness of the entire wall is only at least half a meter, is it all welded together like this?

Welding metals that exceed a certain thickness. This is no easy task. In the real world, large shipbuilding groups and giant machine builders may not be able to do it easily. This can only be done with the help of specialized welding equipment. And in the "Rome" base in this world, since it is concluded that the "black wall" was built in a hurry, then Long Yun naturally thinks that the engineers in the base are not qualified to carry out deep welding of large metal components here - if it is only one or two welds, maybe they can still manage to do it, such a huge metal wall of amazing scale is simply impossible.

In this case, the wall should be staggered together with metal components like brickwork. And then just welded the seams inside and out?

The seemingly impregnable "black wall" is not really monolithic, thinking of this, Long Yun pondered on the spot, he felt that he should have found a shortcut to break through this steel barrier. Compared with drilling a large hole in the wall or forcibly dismantling the airlock door, if you can remove a component by cutting the weld -

Oh, it still doesn't work, it doesn't seem to be easy!

The problem is that the metal components that make up the "black wall" are all huge, so take a cursory look at the welds on the wall. These rectangular metal components, which are several meters long and wide, even if they are exactly what he thought. It's just that some wide iron plates that are not too thick may weigh one or twenty tons.

Thinking of this, Long Yun checked the tools in his hand, and felt that it was better not to bother with this thought, cutting the weld was not an easy job, and then if he couldn't dismantle a component, it would still be in vain.

In addition, there is another question, what is the mechanical strength of this metal giant wall that does not know the specific composition?

Alone in the "dead city", no one bothered, and there was no need to race against time, after checking the general structure of the "black wall", Long Yun remembered to confirm the characteristics of this black and swarthy metal material, he turned out an alloy steel drill pipe from the carrying tool, and tried to use the drill bit to carve on the wall, only to see that the rough and uneven dark metal immediately left a clear scratch, and he probably had a number in his heart, obviously the hardness of the material of the "black wall" itself is not high at all, which is probably the level of ordinary steel. The Mohs hardness is generally below 5.5.

After confirming that the material is relatively "soft", you can use a complete set of tools to try to break through, and then Long Yun carefully considered the plan to find the easiest breakthrough to work.

Time is limited, where to start to penetrate this giant wall in the most economical and fastest?

Generally speaking, a building made of steel, no matter what the purpose of design and construction, must have the entrance and exit is often the weakest point, Long Yun also felt at the beginning that he should start with the airlock door in front of him.

However, with this in mind, he stepped forward and groped for it, only to find that the heavy airlock in front of him was cast as a piece, and only machined at the edge to seal the door slot, so the gate that seemed to be less thick became the strongest part of the black wall.

If it's a whole piece of metal, it's not easy to drill through.

Seeing this, he basically gave up the idea of the airlock door, but Long Yun was even more convinced that although this giant wall looked very strong and thicker than the main armor belt of a battleship, it did not have high mechanical strength, and it could not be built to resist mechanical impact or external force damage - with such a soft metal material piled up like a wall, and then welded the joints, the mechanical stability of this configuration is actually very poor, maybe it will directly collapse and collapse after a bombshell.

So if you speculate like this, is this still a structure like "electromagnetic shielding"?

Long Yun had already had such a guess, but he had always felt that this assumption might not be correct, because from his own feelings, it was obvious that this heavy metal wall had not achieved the purpose of shielding: if the "black wall" was built in the "Rome" base to block the mysterious consciousness sensor behind the wall, then there is no doubt that this effort seemed to have failed in the end.

Of course, there is another possibility, that is, the shield of the "black wall" is actually effective, and it is only because the intensity of the mind behind the wall is too strong that it will be felt by him on the other side of the wall.

Of course, which of these two possibilities is correct, Long Yun still has no clue.

Probably figured out the structure of the "black wall" and stood in front of the airlock door, Long Yun was a little discouraged, because whether it was a whole piece of metal or metal components welded to each other, it was too difficult for him to cut it with the tools brought this time; If he didn't want to spend the next few days crouching here doing hard labor—and the fuel had to be squandered—he had to wonder if there was any other way.

Entering the "Dead City" in the afternoon, and since then he has been busy in the core area of the base, Long Yun, who was bored thinking, gradually felt hungry, he raised his hand to look at his watch, and it was already more than five o'clock in the evening.

In early winter in Central Asia, it gets dark very early, and it must be already dark outside.

Time passed, feeling a wisp of chill wafting in from the entrance of the building, Long Yun sat down on the ground to rest for a while, drank a little water, and then tore open a self-heating field food and ate it indiscriminately.

When eating, his head was not idle, and after thinking about it repeatedly, Long Yun felt that his thinking was right, if he wanted to pass through this thick "black wall", he still had to find a way on the airlock; And to try to enter through the gate, violence is not the first choice, he had better look for the opening and closing mechanism of the gate.

Not to mention anything else, based on his careful observation just now, such a heavy metal gate is definitely not something that can be opened by manpower, even with a winch, it is impossible, so it must require mechanical action.

Now, although there was an inexplicable tragedy in the "dead city" and all electronic equipment was reimbursed, the so-called electronic control equipment, to put it bluntly, only played a role in signal transmission in the mechanical system; If he finds the opening and closing mechanism of the gate, he has all kinds of power tools in his hand, or he can try to drive it separately, maybe he can?

As soon as he thought of what kind of thing would be dormant after this thick black "black wall", Long Yun felt inexplicably full of energy, and as soon as he had an idea, it would be difficult to act immediately; He immediately got up and picked up the acetylene blowtorch and looked around the airlock for a while.

On the basis of his previous observations, Long Yun looked very carefully this time, and he also found that this seemingly unbreakable "black wall" obviously extended to the underground of the huge building. Of course, he didn't have time to dig all the way down now, and after thinking about it, he felt that the airlock should not be too much lower than the horizon, which would not only be troublesome to maintain—well, maybe the hastily built things didn't think about so much, and the more important reason was that it was completely unnecessary.

This speculation should be more reliable, after all, in the "Rome" base, where there are no idle people and no need to be heavily guarded, the most likely location of the temporarily installed equipment is of course near the gate.

Thinking of this, Long Yun carried a small hammer and began to try to knock around on the walls left and right of the airlock, using a very simple echo method to find the possible installation space of the action mechanism; Finding nothing on the left side of the gate, he turned to the right again, and soon spotted a large echo cavity that was not supposed to be completely solid.

Roughly exploring the location clearly, Long Yun took out a piece of chalk and drew a general construction area on the wall.

Not knowing whether the material of the wall was uniform, he tried to knock it with a hammer and a steel drill, and found that the steel drill could still cut shallow pits in the wall, and it was obvious that the materials of this large wall were equally soft; So he immediately went to the tool pile, dragged and dragged a small diesel engine, mechanical gearbox, flywheel cutter and other equipment in place, and then put on a pair of asbestos gloves, buckled up a protective mask, and began the work of metal cutting. (To be continued......)