An icy chill continued to emanate from the narrow cave.
If he wanted to enter the cave and explore, he probably wouldn't be able to do so comfortably with his current equipment.
The chill emanating from the cave alone was enough to make Xu Xin, who was standing at the entrance, shiver. The temperature inside must have been below minus fifty degrees Celsius, or even far lower.
He glanced at the time. It had only been over half an hour since he started climbing up. He still had plenty of time before the twelve-hour deadline given by the mission.
And he had already climbed more than 300 meters.
It wasn't surprising, because the twelve-hour limit was for ordinary survivors. And with his increased arm strength today, his climbing speed was much, much faster than that of ordinary survivors.
He took plenty of time to stop and rest and explore along the way.
"Click..." There was another subtle sound.
This time, because he was at the entrance of the cave and the sound came from inside the cave, Xu Xin could hear it clearly.
It sounded a bit like something cracking.
For example, the sound of rocks cracking or ice breaking.
Xu Xin looked at the corner at the end of the cave and decided to go in and find out.
Instead of taking out the energy core fragment directly, he walked in slowly.
If there was any danger inside, the light from the energy core fragments would likely disturb it.
In this freezing high altitude, he couldn't afford to be careless at all. He could only walk quietly into the cave by himself.
He walked gently, step by step, to the corner of the cave.
Although they had just been separated for a short time, Xu Xin already missed Coco.
If it was Coco, she should have told him by now whether there was any danger in the cave.
If there was no danger, the little guy Coco would probably jump off his shoulders and rush in before him.
Of course, Coco couldn't stand such low temperatures.
He took a deep breath, and the icy chill penetrated directly into his heart and lungs.
The temperature around him was already below minus fifty degrees Celsius, and he could already feel the distinct coldness, which was probably equivalent to the feeling of going out in short sleeves in the middle of winter.
However, because his physique is now extraordinary, he can still withstand this kind of cold as long as it does not last too long.
He took out a blue-level iron sword from his backpack. Yes, it was the iron sword he made for use in caves when he explored the dungeon before.
The cave this time was also very narrow, but of course, it was much more spacious than the maze cave last time. That time I could only pass through sideways, but this time at least I could walk normally.
After turning the corner, there is a straight narrow passage.
This straight and narrow passage, less than one meter wide, is different from the cave outside the corner. The rock walls are relatively neat, a bit like a passage built by humans.
There was a thin layer of frost on the stone walls of the passage.
A strange feeling arose in Xu Xin's heart. He always felt that this place was inexplicably familiar.
“Click…”
The subtle sound came from the end of the passage. He quickened his pace and walked forward quickly without making any sound.
Soon, he came to the end of the passage.
"This is……?"
The extremely biting cold could not hide his surprise at this moment.
At the end of the passage, there was a door!
A... somewhat rotten wooden door!
The entire door is very rotten and even crooked. The entire facade is very dilapidated and has some cracks. There is a thin layer of frost on the wooden door.
This door looks like it will fall down if you push it.
This wooden door looks so familiar!
The material, the level of decay, and the familiar door handle style...
Aren’t these the rotten wooden doors of the rooms he discovered in the underground city where Chang Yin’s family lived!
Why... why is there such a wooden door here?!
and……
He turned around and looked.
The familiar feeling he felt while walking through this passage gradually fermented, and memories began to emerge in his mind.
It's the stone wall of the underground city passage!
The stone walls of this straight passage are made of exactly the same material as the stone walls of the dungeon!
However, the passages in the underground city, even the narrowest ones, are much wider than here. Moreover, the rotten wooden doors are on both sides of the passages, while the door here is only the one at the end of the passage, so he did not recognize it immediately.
An underground city...? There's an underground city high up in the sky within this giant peak?
“Click…”
Another sound came from behind the almost completely rotten door and from inside the room.
Whatever made the noise was inside.
So weird!
Xu Xin could feel that because of the low temperature, the air here was very dry, so the humidity was also very low.
If he took a deep breath, he would not only shiver with cold, but also feel a little dry in the mouth.
If this door had been kept in such a low-temperature and dry environment, it would not have been possible for it to decay like this!
The wooden door of the underground city had decayed in that state because the environment was extremely humid, so humid that water droplets were dripping from the rock wall above.
The door here shouldn't be...
Looking at the frost on the wooden door, it felt to him as if... the originally humid and warm environment suddenly became very cold, and then the moisture was directly frozen on the door, making it look as if the door was frozen.
...Yes, didn’t this mountain appear suddenly?
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