And the leading giant rat seemed to nod very satisfied after the four giant rats got into the hole, and then "squeaked" again, and ran deeper into the passage with the remaining four giant rats.

Looking at the familiar scene in front of him, Lin Cheng thought for a moment, and then saw his expression change, and secretly exclaimed in his heart: "This is ...... In shifts?! ”

That's right, these giant rats are not 'quarreling' at all from the beginning, but just explaining some problems in the handover, this series of processes are very similar to the security handover work of human society, the largest giant rat should be the 'security captain', and the four giant rats that got into the hole in the cave wall are back in the 'security booth' after the handover is completed!

"It's really against the sky......"

After thinking about this, Lin Cheng's eyes were shocked in addition to shock, he had seen a lot of intelligent creatures, at least the wisdom shown by Coke was no worse than that of ordinary humans, but the various behaviors shown by these giant rats made him completely understand that these large numbers of giant rats had not only awakened their wisdom, but even developed their own 'rules'!

This is already a qualitative change, the giant rats who know how to abide by the rules have formed a huge and cohesive force, let alone here, even if they are thrown into the deepest fallen first-tier cities such as Yanjing, they are definitely a super force!

Squinting his eyes and hesitating for a few seconds, Lin Cheng looked at him and decided not to think about it anymore.

Although he hadn't had much contact with it yet, the various performances of these giant rats had already flashed a trace of uneasiness in his heart, which made him want to retreat a little, after all, compared to his life, the matter of upgrading the capsule system was actually not too anxious.

But he still didn't want to retreat, in addition to shocking him, the performance of these giant rats was more incomprehensible, it was not uncommon for animals to have their own group consciousness, but the behavior shown by these giant rats was no longer explained by simple group consciousness, he guessed that these giant rats must have been inspired by some kind of inspiration to be so rebellious, and this kind of inspiration Lin Cheng subconsciously thought of the mysterious pattern that had plagued him for a long time!

He didn't know why he subconsciously associated these giant rats with that mysterious pattern, but once this thought appeared, he was a little uncontrollably eager to figure it out, coupled with the urgency of upgrading the capsule system, he was willing to give up halfway!

Slowing down his breathing, Lin Cheng glanced at the holes on both sides of the cave wall, pricked up his ears and listened to the movement in the depths of the passage, and made sure that the 'security captain' had gone away at this time, so his mind moved, and he saw two ice veins quickly spreading along the cave wall towards the two cave entrances, and in a blink of an eye, the four giant rats nesting in the cave didn't even have a chance to struggle, and were instantly frozen into zombies by the cold air condensed by the ice veins!

"Keep up!"

After casually eliminating the four 'security rats', Lin Cheng beckoned to Peter and Bai Ling, who were hiding not far behind him, and motioned for them to follow, while he tentatively went around the corner and continued to walk towards the depths of the passage.

"Don't worry, you haven't said anything about it just now?"

Seeing that Lin Cheng was walking faster and faster and was even about to run, Peter became more and more puzzled in his heart, and couldn't help but catch up and ask him.

"What can it be? A couple of giant rats that take over security work......"

Pouting, Lin Cheng casually explained a few words to him, and then regardless of Peter, who was shocked, he walked forward more than ten meters again, and suddenly stopped!

"What's wrong again?"

Before he could recover from the shock of the 'security rat', seeing that Lin Cheng, who had been hurrying just now, suddenly stopped, Peter hurriedly followed and asked, but just after he finished asking, his eyes suddenly widened!

It turned out that as they went deeper and deeper down the passage, they finally went down to the bottom at this time, and the true appearance of this giant rat nest that had always made them jealous made them look confused, and they didn't know how to describe their mood at this time!

As far as the eye can see, a flat concrete floor spreads from under their feet all the way to the distance, although this concrete floor has already formed a thick layer of moss, but anyone who looks at it can know that this is definitely the work of human beings!

The ceiling above the head is a curved concrete wall that extends from the ceiling to the four walls, making it look as if it was made in one go, and although the workmanship is somewhat rough, the materials are extremely compact.

The vast hall of the 'round sky' looked very empty, with a few rotten gym equipment scattered in the corners, and no graphic text on the walls, as if this hall made of cement from top to bottom was only used to hold air, and there was no sign that could indicate its specific purpose.

"Did we inadvertently break into some underground base?"

Holding a flashlight and scanning back and forth in this empty hall several times, Lin Cheng, who found nothing, couldn't help but frown and muttered, this hall appeared too suddenly and too weirdly, they obviously came down the passage of the giant rat's lair, but after coming down, they entered such a hall that was obviously built by humans, and anyone would be confused.

"Underground base......

Hearing Lin Cheng's speculation, Peter also frowned and muttered: "As far as I know, Kalk City was a very prosperous industrial and mining city before it was abandoned, and this kind of city has one thing in common, that is, the lifeblood of the city is completely in the hands of ore reserves!" Before it was abandoned, the city of Kalk transported nearly 10% of the country's ore to various places every year, and this glory can be said to be unprecedented in the history of Erros! And as time goes by and ore reserves deteriorate, the rulers of the city want to desperately save this doomed industrial and mining city, and it is not impossible to dig underground in the city......"

"So there's still such a thing? No wonder! ”

Hearing Peter's explanation and analysis, Lin Cheng suddenly realized that the underground base was not too unfamiliar to him who grew up in Huaguo, but most of the underground bases in Huaguo had a strategic layout, so he took it for granted at first that this might also be an abandoned underground fortress, but now when he heard Peter say this, he realized that the ancestors of the original Kalk City started by mining, and it was not a matter at all to have an ore base or something underground.

But after Peter reluctantly explained the reason for the existence of this hall, he couldn't help but mutter, "Tsk...... That being said, I've lived here for twenty years, and why haven't I heard of any underground ore base in Kalk City before that? And in the past twenty years, I have searched in this empty city, but I have never seen the entrance to the underground ore base? It's weird......"