It was not clear what Qi Lin had originally dug this tunnel from, but judging from the current situation, it was obvious that this tunnel was so wide when it was formed, and even earth dragons could pass through, not to mention those ghouls who were about the same size as humans.

Although a 30-centimeter-thick steel plate was buried in the outer rock layer during the construction of Vault 1029, in front of the earth dragon with corrosive saliva, this steel plate is as fragile as a piece of paper, and only that expensive special corrosion-resistant alloy can resist the earth dragon's saliva, but the price of that thing is too expensive, no matter which force builds the shelter, this material cannot be used to make the outer partition of the shelter.

And it was precisely because of the corrosion of the earth dragon saliva that the traces left by the original tunnel when it was excavated were completely erased, and Qi Lin couldn't even tell whether this tunnel was dug by machinery or by mutated creatures.

That's a rock formation tens of meters thick! You must know that the rock in this area is black granite with a tight texture, high hardness, and strong corrosion resistance, which is more corrosion-resistant than simple steel, and it is very difficult to excavate.

If it weren't for the fact that there was a natural cavity in the ground, the consortium would not have chosen to choose Evacuation No. 1029 here in the first place - for no other reason than because the excavation was too difficult.

Even humans with high-tech engineering equipment find it tricky, let alone mutated creatures with only claws and teeth.

The last time Qi Lin passed through here, this tunnel had not yet appeared, and it had only been a few days, even if it was drilled with that kind of diamond bit for drilling oil wells, it was estimated that these few days would not be enough to drill such a tunnel.

However, Qi Lin didn't have time to delve into this problem now, and the first thing he had to do was to completely block this passage to prevent more mutant creatures from entering Vault 1029.

That being said, to block such a tunnel, the amount of work can be said to be quite huge......

Fortunately, in order to build fortifications, Zhao Weiju's subordinates brought several engineering armors, in addition, there was a medium-sized cement production plant in the occupied area.

If you want to open such a tunnel, there will definitely be an extremely large amount of earth and stone excavated, but just like the excavation method, these disappeared earth and stone have become a mystery - in short, Qi Lin could not find any trace of the excavated earth and stone inside the shelter and around the exit.

Qi Lin had no choice but to ask the soldiers to dig the rock wall at the edge of the shelter and fill the tunnel in this way of "tearing down the east wall and making up the west wall".

The high-powered cement mixer was running on the clearing, making a loud roar, although this noise might attract mutated creatures roaming the surface, but Qi Lin still chose to take this risk rather than the trouble of transportation.

Stones hewn out of the rock face, broken bricks from ruined neighborhoods, etc., were mixed with cement and piled up little by little inside the tunnel.

It was impossible to block the entire tunnel, and all Qi Lin could do was block one-third of the length, but even so, it would be impossible for ordinary mutant creatures to open the tunnel again with their own strength.

As for the "mysterious power" that excavated the tunnel at the beginning, Qi Lin didn't bother to care, if this "mysterious power" really wanted to dig another tunnel out, there would be basically no difference between blocking it all and blocking one-third......

"Let's put all of this stuff into the concrete." Zhao Weiju, who had escorted the captives, had also returned, and he had his men collect all the scrap steel in the occupied area and transport it to the tunnel entrance, adding these things to the concrete, which could significantly increase the strength of the concrete.

Several pieces of engineering armor held a thick pipe that was hugged by one person, and the mouth of the pipe was constantly sprayed with evenly mixed concrete—the soldiers first piled scrap steel and masonry in the tunnel, then poured concrete on top of the steel, waited for this layer of concrete to solidify, and then repeated the first step of piling up scrap steel and masonry.

The progress bar of the blockade project was advancing slowly, and Qi Lin also took advantage of this time to hand over the command of the armored forces of the Lexing Star Shield Consortium to Zhao Weiju - now, it was almost time to leave.

"When the fight is over, I'll invite you to drink." Zhao Weiju patted the smooth shoulder armor of Thor's hammer, and Qi Lin also smiled heartily: "Okay, I will definitely slaughter you when the time comes." ”

"Oh, I forgot to say, I'm in for a treat, but you pay."

The two joked with each other, but they both knew ...... This war is far from over, and it is completely unknown whether they will all be alive when that day comes.

"All in all...... Take care, don't hang up easily, and remember that you still owe me a drink. ”

"You too. Well, but you guy's strong batch, and such awesome armor, it's not easy to die. ”

After saying goodbye to Zhao Weiju, Qi Lin hurried back to the Eagle Station, just in time to bump into Persephone who had just walked out of the station restaurant.

"I heard, you're leaving, right?" Persephone surprisingly did not tempt Qi Lin, but in her clear eyes, there was a hint of sorrow.

"Hmm...... It's going to go, in fact, ......" Qi Lin looked around, and then lowered his voice, "You'd better get out of here too, this place may soon become a frontal battlefield, and the Lex Star Shield Consortium won't be able to gain anything from this place." ”

"I know." Persephone pulled a strand of sideburns behind her ear and said, "But the people above don't think much that in their eyes, since the price has been paid, then the deal must be completed, no matter what is obtained in the end." ”

"Are you going to stay here forever?" Qi Lin frowned, Zhao Weiju is a soldier, and it is his duty to stay here, but Persephone is not.

"That's not true, the consortium can rest assured that such a new district full of development potential will be handed over to me, and when they elect the consul of the new district, they should come over to take over my work."

"That's good, be careful yourself." Hearing Persephone say this, Qi Lin breathed a sigh of relief.

"Well, then, see you next time......" Persephone hugged Qi Lin's neck, and after the two had a deep kiss, she watched Qi Lin get into the return train.

……

"Special Flight No. 5559 is about to depart—"

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