Without saying a word, Xu Xin jumped onto the rusty iron ladder and climbed up with all her strength.

That red gas, wasn't it the iron door of the underground passage that he had just opened, and the red smoke that was so smelly that it made people question life poured out of the iron door!

The smoke will float upward and will definitely spread upward along the channel until it fills the entire channel!

He must not be overtaken by this smoke. Whether it is poisonous or not is another matter. He never wants to smell the smell like canned herring in hell!

Climb! Climb quickly!

With the little panda Coco lying on her shoulders and a gold treasure box on her back, Xu Xin climbed up like crazy as if on steroids.

Xu Xin, who was carrying the gold treasure box on his back, seemed to be running with a heavy load at this time, but when he thought of the pattern on the treasure box, he finally gritted his teeth and did not throw the gold treasure box down.

He didn't know how long he had been climbing. He only knew that his hands and feet were almost numb.

Finally, he couldn't hold on any longer and hung on the rusty iron ladder, breathing heavily.

He looked back with horror on his face.

However, what surprised and pleased him was that the red mist did not follow behind him, but far below. Xu Xin, who had night vision, could barely see the faint red below.

The diffusion speed of the red gas seemed to be much slower than he imagined.

Xu Xin breathed a huge sigh of relief, sat down on a ladder, and began to rest.

Let's eat something before the red gas comes up.

Xu Xin took out an apple and gnawed it, then gave one to Coco.

Coco also gnawed an apple on his shoulder.

After one of the little pandas had eaten and drank enough, Xu Xin was almost rested.

He was a little surprised to feel his body. If it had been before, he would never have recovered so quickly after strenuous exercise. Now his physical quality is really different from before.

I glanced below and saw that the red mist was slightly closer, but still far away.

But Xu Xin didn't waste time and continued to climb up.

Only when he returned to the ground and stepped on the land protected by the tree house could he feel at ease.

Continuing to crawl, Xu Xin maintained her rhythm this time and was no longer as fussy as before, getting closer and closer to the exit step by step.

After climbing for a long time, just when he felt that he was almost at the exit, Coco on his shoulder suddenly screamed, his voice full of anxiety.

"What's wrong?" Xu Xin looked back when she saw Keke was in such a hurry.

Then he was shocked!

That flash of red was actually very close to him, only five or six meters away.

What's going on! How did it spread so fast?!

In just a moment, Xu Xin figured out the principle. The red gas does spread slowly, but it does not mean that it is released slowly in the room below. As long as the release is accelerated, the concentration of the red gas is high, and the air pressure increases, the diffusion will naturally become

quick!

"Fuck!" Xu Xin yelled angrily and climbed up faster.

He learned the lesson this time and no longer used all his strength, but still maintained the rhythm. However, the extremely fast speed was still too much for his body, and his breathing gradually began to become disordered.

While crawling, Xu Xin turned around and looked down from time to time. The red color was getting closer and closer to him, and was already only two or three meters away!

"I see the exit!" Xu Xin became excited, no longer caring about the rhythm, and began to climb up with all her strength.

Just before the red mist was about to catch up with him, Xu Xin rushed out of the iron door, then used the last bit of his body's strength to lift the heavy iron cover on the other side and fiercely covered the exit.

"boom!"

A few wisps of red smoke came out of the last crack in the iron cover, and the rest was trapped under the iron cover, in the extremely long passage.

The wisp of red smoke got into Xu Xin's nose.

"vomit--"

Just a wisp of it made Xu Xin sick. He couldn't believe what would happen if his whole body was soaked in that red smoke.

Sitting at the exit, Xu Xin was breathing heavily. His arms and legs were shaking due to excessive climbing, and his head was a little dizzy.

Coco lay on his lap and looked at him with her head tilted, as if wondering why you are so tired.

"Little thing!" Xu Xin rubbed Coco's head angrily.

After resting for a few minutes, Xu Xin felt that her strength was gradually recovering and stood up.

After walking out of the passage, the sun shone on him. It was already bright outside.

After staying in a relatively dark environment for so long, Xu Xin suddenly saw the light, her eyes couldn't stand it, and she covered the sun with her hands.

After gradually getting used to it, he looked at the ordinary plants on the ground and finally smiled with relief.

The world below was really too depressing, and the consumption and impact on his physical and mental energy never stopped. Having seen the monsters in the underground world, Xu Xin even felt that the beasts on the ground were so cute.

Surrounding it is still the wasteland left after the yellow flowers withered.

"Go home, go home!" Xu Xin now wanted to go back to the tree house and have a good sleep.

Although his orange (blue) color keeps him in a relatively excited state, his physical and mental exhaustion has reached its peak. He doesn't want to do anything now, he just wants to lie in bed and mess around.

From where he is now, it would take about an hour to walk back.

"Sigh... when will we have a means of transportation?" Xu Xin thought that there was still an hour to go, and her legs that had just recovered began to feel a dull pain again.

He looked at the little guy who was lying on his shoulder and started to take a nap again, and shook his head helplessly. Good guy, I am the mount, right?

I have no choice but to walk back.

It was already the afternoon of the second day. Looking at the sun in the sky, it should be around two o'clock. It happened to be the hottest time. Xu Xin took out the mineral water provided by the novice supplies from his backpack and took two sips of it. He slowly drank like

It was like taking a walk towards the tree house.

After he used the bottle of [Special Tree House Root Potion], the tree house's protective range extended for another three kilometers, which was equivalent to four times the area. This range was too large, and it was really powerless to explore it on foot.

Xu Xin opened the map. At this time, there were still only wild beasts in the hills in the northwest of the map. After the tree house's protection range was expanded, those hills would also be within the protection range.

"I should have unlocked the iron armor now. Perhaps, I can try to hunt wild beasts there."

After walking for more than an hour, Xu Xin finally returned to the lake. The tree house was on the other side of the lake.

The lake looked very calm at this time, and piranhas could be faintly seen swimming in the middle of the lake.

"Huh? Why do you feel that the range of this piranha's activities is a little wider? Is it an illusion?" Xu Xin frowned. He found that the nearest piranha he could see seemed to be closer to the shore than when he walked last night

A little to the side.

"Maybe it's just a coincidence." Xu Xin comforted himself. He really didn't have a good way to deal with the piranha now.

Walking around the lake, Xu Xin picked a lot of reeds that could be used to make ropes.

Back under the tree house, Xu Xin took out the bottle of gray potion from his backpack and sprinkled it on the roots of the tree house.

[The roots of the tree house begin to grow again, which lasts for two hours. During this period, the tree house cannot be entered or exited. 】

Xu Xin: "...?"

What does root growth have to do with entering and exiting the tree house?
Chapter completed!