The passage was quiet again. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

Zhou Xin and Spred looked at each other for a moment, and then ordered, "Take two more steps forward and see how it goes." ”

Sure enough, the battle robot took two steps forward, but still nothing happened.

Zhou Xin motioned for the robot to continue walking, and the robot walked forward for about 10 meters, and in the process, there were no more weapons attacking the robot, not even a flash grenade.

Zhou Xin breathed a sigh of relief, and then said, "It seems that we should have passed through this passage." All have gone so far that no new weapons have appeared. ”

Spred nodded, "It looks like we're safe for the time being, but we don't know what else awaits us ahead." ”

Zhou Xin shrugged, "Who knows, let's move on." ”

So, the battle robot began to move forward again, and as it advanced, the only thing that could be heard on the road was the robot's own footsteps, which echoed in the passage in a very strange rhythm. With this strange rhythm, the robot walked forward more than forty meters. At this moment, a wall blocks the robot's path.

It was a wall similar to the previous one, but unlike the previous one, the wall showed a metallic sheen under the light, and the robot went up and tried to knock on the wall, and then the sound of metal colliding was heard.

Zhou Xin said helplessly: "Okay, it's another wall, this time it's still a metal wall, it's really troublesome." ”

Ralph asked curiously, "Do you think there will still be a passage behind this wall?" ”

"I hope not." Zhou Xin's tone was a little hesitant.

"I don't think so." Spred joked, "Any idea how far the robot has come by now?" It's a full 5.6 kilometers, and if you go further, I think you'll have to go to the center of the earth. ”

Zhou Xin shrugged, "The ghost knows what this civilization will prepare for us next, so let's open this wall first." It's time for our engineering robots to take on the field. ”

It just so happened that the time was also at night, and Zhou Xin gave the work instructions to the engineering robot and went to sleep.

The next day, Zhou Xin came to the command cabin early in the morning, Spred and they had already started working in the command cabin, and Zhou Xin, who had just entered the door, saw that they were busy discussing.

As soon as they saw Zhou Xin come in, they didn't bother to say hello, and Spred said directly: "The news of the engineering robot has come up, and the existing equipment of the robot can't open the metal wall. ”

Zhou Xin was a little surprised, "Can't you open it?" Impossible. ”

Spred replied, "The report from the engineering robot is that it can't melt that metal gate. ”

"With our current equipment, we can't melt that gate?" Zhou Xin was a little incredulous, he looked at the screen.

On the screen, next to the metal gate is a pile of equipment, and next to that pile of equipment are two engineering robots. Now, they were standing quietly waiting for orders. Zhou Xin looked towards the metal wall and found that there were traces of flames burning on the wall, but it was only a trace, and the whole wall was still so smooth.

Seeing this scene, Zhou Xin asked the engineering robot standing aside, "Is there really no way to open this wall?" ”

"The wall has a hardness and a higher melting point than our known alloys, and our existing equipment cannot open the wall." Engineering Robot Report.

Zhou Xin thought for a moment, and then asked Spred: "Your alloy technology is not higher than ours, do you have any solution for this alloy wall?" ”

Spred spread his hands, "We were discussing this issue just now, according to the information sent back by the engineering robot, we analyzed that the alloy that makes up this wall is stronger than the alloy we made, and the melting point is also above the alloy we made, and we estimate that there is no way to take this alloy." ”

Zhou Xin frowned, "Even you can't do anything." Zhou Xin thought for a moment and continued to ask, "Isn't there anything on the ship's equipment that can produce higher temperatures now?" ”

"The flame temperature of the tail flame of this ship's engine can reach more than 20,000 °C." Voyager replied.

"......," Zhou Xin said speechlessly, "it's impossible to ask me to move the engine down and open the door." How did they do it to make the alloy have such a high melting point. ”

"Actually, it's not a pure alloy." "The alloy of this wall is made on a similar principle to the one we make alloys, which is a mixture of metal and some special materials, but the special materials they found are more resistant to high temperatures than what we are using now. ”

Zhou Xin nodded, and said helplessly, "It's useless to know the manufacturing principle, we still can't break this wall." ”

"Sorry, I can't help much." Spred also said helplessly.

Zhou Xin waved his hand, and then looked at the wall carefully, because of the stone wall before, so Zhou Xin did not observe this wall carefully, and now since it cannot be opened by violent methods, Zhou Xin wants to observe this wall carefully.

At first glance, this alloy wall is not much different from the previous stone door except for the material, the surface is smooth, and there are no gaps in sight, and the joints with the passage wall are very thin, and it is completely impossible to put tools in. But Zhou Xin took a closer look and found that there was something unusual on this wall.

In the middle of this wall, Zhou Xin vaguely saw a vague pattern, at first he thought it was his illusion, blinked vigorously, Zhou Xin found that the pattern on the wall did exist, so he signaled the engineering robot to focus the light on the blurred pattern, under the strong light, Zhou Xin finally saw the pattern clearly.

It was a slender pattern similar to a willow leaf shape, with a slight S-shaped twist in the middle of the pattern, the edges of the pattern were very irregular, with various zigzag shapes, and a few irregular curves were drawn in the pattern, and there were a few small dots on the outside of the pattern, which were of different sizes and scattered around the entire pattern. Finally, the entire pattern is enclosed in a complete ring.

Seeing this irregular pattern, Zhou Xin was a little puzzled, "Why is this pattern so strange, except for the ring on the outside, why is there such an irregular pattern inside?" What exactly does this irregular pattern represent, is it one of the symbols of this civilization? But why did this civilization take such an irregular pattern as its own symbol? I don't see anything unique about this logo at all, it feels like they have drawn a random pattern to use as a logo. ”

"Maybe they have such a unique aesthetic." Spred spread his hands.

Zhou Xin rolled his eyes, "Instead of believing that they have such an aesthetic, I should believe that the sun comes out of the west." ”

Ralph said, "But the sun does come out of the west, isn't your planet like this?" ”

"Forget it, let's not talk about the sun." Zhou Xin said helplessly, "I don't think this pattern has anything to do with aesthetics, and generally no one will use this irregular and complex pattern as a sign." This pattern must have a unique meaning, but we don't know it yet. ”

"Perhaps." Spred shrugged, "Shouldn't we be looking for ways to get in now?" What to discuss this? ”

"Didn't you see it and discuss it by the way?" Zhou Xin said, "Okay, do you have any thoughts on how to pass this wall?" ”

"I can't find the switch, and I can't force my way in, it's really troublesome." Ralph said beside him.

"Maybe there's another way." Spred thought for a long time on the side, then replied.

"Oh?" Zhou Xin asked suspiciously, "What way?" ”

"I'm wondering if we're on the wrong foot." "We've been thinking about how to get through this alloy wall, but we've never thought about whether we're going to be able to get around. ”

"Bypass?"

"That's right, get around." Spred pointed to the screen and said, "Isn't this wall surrounded by marble?" Wouldn't we go ahead and dig a hole in the marble wall next to it? ”

"Is it that simple?" Zhou Xin said suspiciously, "Since they have put a wall here, how can they not think that someone can bypass this wall and enter." ”

"How do you know if you don't try." Spred spread his hands.

"Okay, let's try it." Although Zhou didn't hold out much hope, he still listened to Spark's advice.

So, the idle engineering robot was busy again, this time their work progress was very fast, and after a while, a one-meter-deep hole was carved out of the marble wall, and about 5 meters was dug to the side, Zhou Xin felt that this was far enough, so he motioned to the robot to dig in the direction of the door, only to dig less than 1 meter, Zhou Xin and they saw the familiar metal wall again.

"Look, no." Zhou Xin said to Spred, "I don't think it's that simple. ”

"Looks like I'm taking it for granted." Spred said helplessly, "Where did they get such high technology, this area must not be completely covered by alloys." ”

"Who knows." Zhou Xin said, "But I believe that we will be able to go in sooner or later, since they have led us here, there is no reason to leave a dead end here for us to see, there must be some other way to get in and we haven't found out yet." ”

"Otherwise, let's take a closer look at the nearby passages." Ralph suggested from the side.

"Hmm." Zhou Xin nodded, "Let's go and have a look." ”

The probe left the passage dug by the engineering robot and returned to the main passage, and then they probed around in the passage, looking at the screen in front of them, Zhou Xin and they were also looking for any anomalies in this passage. They searched for a long time, but except for the hole that the engineering robot had just dug out, the surrounding walls were flat and smooth, and there was nothing unusual about it.

Looking at the smooth passage wall, Zhou Xin always felt an indescribable sense of disobedience, but he just didn't know where this sense of disobedience came from. After a long time, Ralph's casual words reminded him.

"It's strange how the walls here are so smooth, and how the grooves that were everywhere on the road before are gone." Ralph muttered.

"What? What did you say? At first, Zhou Xin didn't hear it clearly.

"I said the grooves in the wall were gone." Ralph said.

"That's right, groove." Zhou Xin finally knew what this sense of disobedience was, the grooves that would be fixed on the wall every 10 meters before were gone, and the reason why they didn't find it was because these grooves were so inconspicuous, and Zhou Xin subconsciously ignored this kind of thing in the process of searching.

"Do you think it has anything to do with those grooves?" Spred asked.

"I'm not sure, but why did the grooves that spread all over the passage disappear just near this wall?" Zhou Xin said, "You know, on the passage in front of the previous stone wall, those grooves still exist, and only this section of the passage grooves has disappeared, isn't it strange?" ”

Before Spred could answer, Zhou Xin said to the probe and the robot, "Carefully inspect the surrounding walls to see if there are any similar grooves. ”

It didn't take long for an engineering robot to find a suspected groove on the wall, although that place looked like a smooth wall, but the robot's mechanical arm knocked on it and made a hollow sound, Zhou Xin looked at the place carefully for a while, and found a finger-sized groove in an inconspicuous corner, Zhou Xin motioned to the robot to put the mechanical arm in, and the robot had no action after sticking in, A stone wall of about half a square meter fell from the place where the hollow sound came from and shattered.

Seeing the stone wall falling, Zhou Xin became happy, "It's really weird." Then he looked at the wall where the stone had fallen.

Behind that stone wall was a stone plane with nine buttons arranged in a nine-square grid, and nothing else.

"What does that mean?" Ralph asked next to him, "Is it a switch, but this switch is too strange, it doesn't give us any information, how can we use it?" ”

Seeing the familiar nine-square grid, Zhou Xin had an idea, and he motioned for the robot to use those buttons. The robot casually found a button and pressed it, and Zhou Xin and the others found that nothing happened in the passage, but Zhou Xin saw a dot appear on the button that the robot had pressed. Zhou Xin motioned for the robot to press it again, and this time, two dots appeared on the button.

"It can't really be like that." Zhou Xin muttered to himself, he motioned for the robot to continue pressing, and then 3, 4, and 5 appeared on the button in turn, until 9 points, and then the robot pressed it again, and all 9 points disappeared.

Seeing this scene, Ralph still showed a puzzled expression, while Spreed, who was next to him, showed a thoughtful look. Zhou Xin thought for a long time, and then hesitantly asked the robot to press those buttons in the format of the nine-palace diagram. In the process of pressing the button, Spred also asked suspiciously, "Are you sure this press is correct?" ”

"Let's give it a try." Zhou Xin said uncertainly.

After a while, the robot adjusted the number of the last button, and at the same time as the number was adjusted, Zhou Xin and the others heard a loud roar from the side of the alloy wall......