Seriously, this time Zhang Yuan was really at a loss.

He observed the loading and unloading area for a long time, but could not find a way to infiltrate.

"What to do? What to do...... Wait, there's a situation! ”

A small blue battleship appeared in the passage on the top floor of the mine, this battleship was not very fast, it slowly slid towards the entrance of the mine's security area, and when it reached the entrance, the battleship stopped.

'Huh~' A faint sound of air flow came, and a transparent passage stretched out from the entrance of the security area, and soon docked to the exit of the battleship, and immediately after, a tall and sturdy black-haired young man walked out of the battleship.

As soon as he saw this person, Zhang Yuan's eyes condensed slightly: "It's a master!" ”

From the figure and walking posture, it can be inferred that this young man's physical fitness is very strong, almost exceeding the berserk level, and this person also exudes a very clear mental fluctuation, and the mental fluctuation can reach such a point, and non-doomsday level masters can't do this.

"Young man, with a body and spirit far beyond that of ordinary people in the Golden Heaven Domain, this guy can't be Mi Xiu, right?" Zhang Yuan had this idea in his heart, but immediately after him, he overturned this conjecture: "No, Mi Xiu is a super powerhouse at the top of the doomsday level, this young man is very strong, but there is still a big gap from the level of the top. Leave it at that, I'll continue to observe. ”

This unexpected appearance of the strong man made Zhang Yuan have a lot of patience in his heart, he hid in the corner, motionless, and continued to observe the situation.

When the black-haired young man entered the security area of the mine, he was greeted by several people inside, their expressions were respectful, and when they spoke, they almost knelt on the ground with a clearly visible expression of humility on their faces.

After saying a few words, the black-haired young man walked into the depths of the security area, and Zhang Yuan temporarily lost his news.

After about 40 minutes, there was another anomaly behind the transparent entrance to the security area, this time, there was an extra pure black mecha.

The appearance of this mecha is very different from the security mecha in the mine, judging from the details of the mecha design, the power level of this mecha is at least above the middle of the fury, and at the same time, there is also a strong mental fluctuation from this mecha, which gives Zhang Yuan the feeling that it is exactly the same as the black-haired young man before.

Zhang Yuan's spirits were lifted: "Is the equipment mecha out?" Sure enough, he is a master. ”

The black mech stood behind the entrance for a moment, then the entrance opened, and the mech walked out to the loading and unloading area in the mine.

He didn't come out alone, behind him, there were also 3 black and silver mechas, and the power level of these three mecha was not bad, at least reaching the upper elite level.

After the four mecha warriors left the security area, they walked all the way towards the mine road that Zhang Yuan had seen before, and when they walked through the mine road, those detection aircraft would automatically avoid both sides, and a detection hole appeared for a short time.

"Good chance!"

Zhang Yuan did not hesitate to activate the miniature mecha and launched the 'White Ape Leap' body technique, and the entire mecha was like a dexterous ape, quietly chasing after it.

The speed of the four mecha warriors was not fast, Zhang Yuan chased for 3 seconds and then reached the back of the last mecha warrior, and when he arrived here, Zhang Yuan slowed down and followed the detection hole behind the mecha warrior step by step.

Zhang Yuan's stealth ability of this miniature mecha is really outstanding, coupled with its small size and light weight, when he follows like this, it seems to be a non-existent 'ghost'.

The MechWarrior didn't even notice that he had a little tail on his back, and he was still reporting to the temporary opponent on the squad channel.

Zhang Yuan was not idle after following, he adjusted the resonance frequency of the signal receiver of the miniature mecha little by little, and after five or six seconds, a voice came from the micromecha speaker.

"Sir, this time is a good time to be lucky, there have been no accidents, not even ordinary mechanical accidents."

"Don't take it lightly, this time it's different." The voice of the person who spoke was deep, and there was an indescribable coldness in it.

Zhang Yuan knew that this should be the black-haired young man, and his voice could make his mind shake slightly, which was enough to show that the strength of this young man's mind had reached the doomsday level.

"Sir, our defense is so tight, and this mine is surrounded by 3 military fortresses, who would dare to break in?"

"yes, isn't this a death?"

"Humph! Ignorant! The young man was furious, and the mecha he controlled suddenly stopped, and a black light suddenly flashed on his arm, and there was a long jet-black knife in front of the mecha warrior's chest behind him.

"Do you really think that if you wear a mecha, you are invincible? I tell you, if I want to kill you, it's as simple as stepping on an ant. In the same way, if the leader wants to kill me, a sneeze can seriously injure me. In front of the leader, all of you, plus all the defenses outside, are all decorations! ”

The three mecha warriors behind him looked at each other, and it took a while for a voice to come out of the communication channel: "Sir, do you mean that in the near future, there will be a person as powerful as the leader to invade the mine?" ”

"There's no way to know for sure, but it's likely. The leader takes this matter very seriously, and in no more than 10 hours, he will come in person, and what we have to do is to ensure that there are no problems in the mine during these 10 hours. ”

"Yes, we get it."

Speaking of this, the communication channel fell silent, and a group of mecha warriors continued to move forward in the passage, and walked a full 80 kilometers in this way, the passage gradually became wider, and the mining robots around the passage also increased correspondingly, and at the same time, the strange spiritual fluctuations emanating from the passage also became much stronger.

Zhang Yuan followed closely behind the mecha warrior, and he turned his head to look around, observing the surrounding situation.

He found that the last 3 kilometers of the mine should be newly mined in the last 3 months, and the excavation traces around the mine are fresh, especially in the spacious underground mining area in front of him, which should not be excavated in more than 2 days.

At this time, the sound appeared again in the communication channel.

"Sir, look at this area, the quality of the Grain Boundary Stone Mine here is very poor, the number of red rough stones contained in it has greatly increased, and the radiation has suddenly become almost ten times stronger. I've been here for a long time, and my whole person feels wrong. ”

"Hmm~ kind of interesting."

The black-haired young man spoke, and then, he manipulated the pitch-black mecha to the front of the stone wall, and forcefully broke off a grain boundary stone.

He found that the boundary stones here were no longer translucent milky white stones, they showed a faint red luster, and in the dark light environment, these grain boundary stones would also emit a faint shimmer.

"Hey~ It's so cold here, and the mecha's energy consumption rate has increased by at least 20%!"

Suddenly a voice came from the communication channel, Zhang Yuan looked at the sensor data, and found that the temperature here was at least 10 degrees lower than outside the mine. Strangely, the temperature is low, but the infrared radiation on the surrounding stone walls is very high, and the sensor shows that the temperature of these boundary stones is 12 degrees higher than the air.

What is incomprehensible is that without applying any external force, the temperature of the boundary stones is still slowly rising, and the temperature is still falling little by little, as if these boundary stones can absorb energy.

This is nothing short of a blatant violation of the laws of thermodynamics.

Soon, Zhang Yuan discovered that not only was the energy in the air absorbed by the Boundary Stone, but the energy in the mecha was also slowly withdrawn by some strange force, and there was no way to stop it.

Zhang Yuan found that the energy consumption speed of the miniature mecha was inexplicably increased by about 10% compared to just now.

"This is the energy accumulation phenomenon unique to spiritual power, however, the accumulation effect of ordinary pure spirit is far less intense, and this should be the unique attribute of strange spirits. It's not far from the asteroid core, and along the way, the strange spirit fluctuations are getting stronger, so if you continue to get closer to the core, will the fluctuations become more powerful? ”

Thinking about it like this, Zhang Yuan was a little expectant in his heart.

At this moment, the voice of the black-haired young man sounded in the communication channel again: "Why are these robots digging separately?" ”

One of the mechs immediately explained: "Sir, this is to maximize ore mining, you see, the grain boundary stones on the four walls around here contain a large number of red rough stones, according to the leader's meaning, not a single red rough stone can be wasted, so ......."

"What does the chief mean?" The black-haired young man paused, and after a few seconds, he ordered, "The mining speed here is still too slow, you go and mobilize more digging robots, at least 10 of them!" ”

"Yes, sir!"

After about 5 minutes, Zhang Yuan heard a low roar from the mine behind him, and when he turned his head to look, he saw the excavation robots lined up and rushing towards the spacious mining area.

The black-haired young man's voice sounded again: "Since the closer you get to the core of the asteroid, the higher the content of red rough stones, then the main digging direction will go forward, so that you can mine higher quality red rough stones faster." ”

"No problem."

The mecha warriors began to arrange the digging sequence, and after some deployment, 15 mining robots on the site, 7 mining robots dug deep into the perimeter, and the other 8 were all arranged to dig forward.

These 8 robots take turns to excavate, one of them digs forward at maximum power, and after 5 minutes, after the machine overheats, it is replaced with a new one, and so on, the speed of mining is increased by 4 times!

The mine began to penetrate into the core area of the asteroid at a speed of 40 meters per minute, and as the mine continued to go deeper, the mental fluctuations in the mine became more and more intense, and the energy accumulation effect became more and more terrifying.

"Sir, the speed of the robot's energy consumption has been increased by 1 time, and the energy consumption of the mecha has also increased greatly. The temperature in the mine has dropped to minus 13 degrees! "A fighter debriefed.

"Leave it alone, keep digging! Whatever it takes! The brunette roared loudly, his voice becoming a little fanatical.

Zhang Yuan listened to this conversation, and his heart suddenly moved: "This black-haired young man seems to want to reach the core of the asteroid very much, and for this purpose, he even took it upon himself to modify Mixiu's order, why is this?" ’