Zhou Kang didn't know who the person Xu Chen was talking about, and Xu Chen didn't mean to explain, but waved his hand to let Song Qing open an iron cage carried by the teenagers.

A small white tiger and another dark green baby turtle.

The little white tiger looked full of spirits, and was much larger than the little tortoise, while the little tortoise lay on its stomach limply, its limbs retracted into its shell, its long head curled up, and a long horse face full of haggard expressions.

Xu Chen glanced at it quietly, his heart sank, and he scolded secretly: "Damn, is Lao Tzu's blood so replenished?"

Xu Chen put on a pair of black gloves, and after pressing the two hidden buttons on his wrists, a faint light lit up, and the entire inner armor was complete.

Carefully picked up the little white tiger, this little beast has now grown claws, without wearing inner armor, Xu Chen does not dare to approach it.

Walking to the center of the empty cave, Xu Chen said loudly: "Senior, I arrived as promised!

As he spoke, Xu Chen pinched the little white tiger hard.

A tiger roar echoed in the empty cave, immature, but majestic!

With the roar of the tiger, a little green light suddenly floated in the cave, as if fireflies gathered under the night sky.

The points of light gradually merged, and a vague green figure appeared.

His eyes opened, staring directly at the white tiger in Xu Chen's hand, and said with a shocked expression: "This ...... This is...... Lord Holy Spirit?!"

Xu Chen took a few steps back, avoiding the hand that the green figure wanted to stretch out but trembled.

After a while, Xu is came back to his senses, and saw Xu Chen holding the white tiger with both hands, and the green figure angrily reprimanded: "Bold, dare to be disrespectful to the Holy Spirit!"

Xu Chen shrugged his shoulders and said with a smile: "He is your adult, not mine!"

Xu Chen beckoned back, and Song Qing asked people to carry the iron cage forward, so Xu Chen said to the green figure: "There is another one here, now that I have completed the agreement, I also ask the seniors to let me go, so that I can go and return to my life!"

The green figure looked at the little turtle lying on its stomach in the iron cage again, and said angrily: "You dare to treat the Holy Spirit like this!"

Xu Chen smiled disapprerovingly: "I believe that those two old-timers will not care about these small sections, and now, they are all waiting inside!"

The green figure was angry, but he didn't dare to delay the important matter of the Holy Spirit, so he had to say indignantly: "Follow me!"

Just as the green figure turned around, Xu Chen suddenly smiled and said, "By the way, why don't you leave me a room in the belly of the mountain inside?"

The green figure turned his head and glanced at Zhou Kang and the others, and naturally found the tunnel next to the boulder, but he didn't care.

"You kid thinks beautifully!"

"If you don't have a room, the cave will do!" Xu Chen shouted unwillingly.

The green figure walked forward without looking back.

Seeing that the other party was still indifferent, Xu Chen pretended to sigh and said, "Alas...... I can't help but beg those two old-timers!"

The green figure turned around and sneered, "Then wait until you have the order of the Holy Spirit!"

After speaking, he walked straight to the mountain wall on the side of the cave, the stalactites above his head pointed to the earth like thorns, and the green figure stayed between the two stalactites, and suddenly his body shook, and turned into a little green light again, converging between the two stalactites.

At this moment, in the narrow passage on the other side of the cave, this narrow passage is the road where Xu Chen and the others walked out, leading directly to the canyon of Jiulongyao. Yang Ziyun was hiding here quietly with Shi Lei after his disguise and Xiaohualu wrapped in a black robe, stretching his neck and watching cautiously.

After the green figure dissipated, a cloud of green light was suspended between the two stalactites, and after a while, the light suddenly moved, turning into a pitch-black passage.

Xu Chen turned back to Zhou Kang and said, "Keep it as planned!"

"Okay!" With that, he led the man into the excavated tunnel, and lowered the boulder mechanism at the same time.

Immediately, Xu Chen nodded at everyone.

The twenty teenagers then took out a black round helmet one after another, and the position of the helmet's eyes was inlaid with a strip of extremely high transparency, which was divided into two layers, the outer layer was made of an extremely hard ore in the cultivation realm, and the inner layer was made of extremely transparent glass, and the middle was glued together with a colorless and transparent demon beast grease, and a small steel pipe was embedded in the back of the helmet's head.

The helmet was designed by Xu Chen in the shape of a helmet, and the outermost layer of metal was all the top material in the cultivation realm, and it was engraved with defensive runes, just to isolate oxygen, and now it was covered with a thick layer of soft skin.

The inside of the helmet, in addition to a thick layer of cashmere, is more important is a layer of cowhide with the best airtightness, in order to isolate the helmet from the oxygen that will be filled in later, causing erosion of the outer layer of Xiuzhen Realm materials, and the small steel pipe at the back of the head is naturally made of ordinary steel from the outside world.

After the teenagers put on their hats, they immediately lifted their backhands on the seat at the back of their necks, and a steel cylinder that was a foot long behind them was inserted into it by the small steel pipe on the helmet.

The cylinder is also two layers inside and outside, the outside is a hard Xiuzhen realm material, the middle is separated by cowhide, and the innermost layer is ordinary steel, in addition to a large oxygen cylinder on his back, Xu Chen also prepared three small cylinders for each of the teenagers, hanging them around their waists in case of emergency.

Fortunately, with electricity and the help of runes, it is not difficult to do the experiment of electrolysis of water to oxygen.

In this operation, in addition to weapons and ammunition, oxygen cylinders are naturally the focus of Xu Chen's preparations.

Equipment is one thing, and in addition to good marksmanship, the teenagers selected this time are also extraordinary in diving!

In addition, he has learned the breath-holding method taught by Chai Lao, although he still can't achieve the turtle breath technique of the Jianghu people, but he can hold on to it for half an hour while completely holding his breath. With this buffer time, as long as you don't break away from the main army, there will be no worry about lack of oxygen.

Seeing that the brothers were ready, Xu Chen nodded and said, "Let's go!"

Seeing that the eldest brothers were about to go in, the disguised little stone was very anxious, and his body was about to run forward.

Yang Ziyun grabbed him and scolded: "What's the hurry!"

Shi Lei hurriedly said: "Big brother, they're going in!"

Yang Ziyun thought about it, and always felt that something was missing in her heart, and after carefully looking at the steel cylinder Xu Chen was carrying behind them, she suddenly woke up and shouted: "Oh no!

After speaking, Yang Ziyun rushed towards Xu Chen, and at the same time shouted loudly: "Wait for me!"

When Xu Chen heard this, he stopped and turned around, and said with a smile: "I thought you weren't coming!"

"You care about me!" Yang Ziyun, who was still angry, stretched out her hand with a straight face and said, "Take it!"

"What?" Xu Chen said blankly.

Yang Ziyun pointed to the steel cylinders on the backs of the teenagers and said, "I brought a brother here, and I want a copy of this thing!"

Saying that, he beckoned to the back, Shi Lei lowered his head and walked over with a cat, and as he walked, he suddenly remembered that now that he had changed his face, the eldest brother would definitely not recognize it, so his waist stiffened again.

Xu Chen didn't think much about this strange face and didn't think much about such a strange behavior, Yang Ziyun brought someone with him, it was nothing more than spending an extra oxygen cylinder.

Thinking about it, Xu Chen handed over a small metal box.

This is Xu Chen's new harvest from studying runes this month, imitating the runes that expand the space, carving his own runes on a special metal, thus creating a storage box.

It's just that today's storage boxes are quite restrictive, and they can only be made of this material in the cultivation realm, and they are extremely heavy! At the same time, the space for expansion is not large, fortunately, there are runes to reduce weight, otherwise even if Xu Chen can put things in, he will not be able to carry it.

But this storage box still has its best advantages!

As long as the spirit stone is installed, even ordinary people who have not practiced can use it normally.

Yang Ziyun looked at it for a moment, and after pressing a small switch, the iron box instantly increased. Seeing this, Shi Lei's eyes lit up even more, but fortunately, his surprised performance now was normal.

And Xu Chen, who was bent on guarding against the tree demon eavesdropping, didn't have the heart to stay here for a long time, and after giving the things, he led the teenagers into the dark light hole.

After seeing the eldest brother enter, Shi Lei hurriedly changed his equipment, and all the equipment was depicted with runes to reduce weight, so it was not tiring to carry it on his body.

After Shi Lei changed his clothes, he walked towards Yang Ziyun, and Xiaohualu, who didn't understand why Xiaoshi was carrying a lot of things, naturally followed quietly.

Seeing that the light hole was shrinking, Yang Ziyun looked back, but saw that Xiaohualu was still following behind, and hurriedly said anxiously: "Why are you still carrying it?"

"Ah, who will Xiaohua follow if she doesn't follow me?" Shi Lei said blankly.

"You can enter, but it can't enter!" Yang Ziyun said urgently.

"Why?" Shi Lei looked puzzled.

Xu Chen never mentioned it to the second person except for talking to Yang Ziyun about oxygen. The advice to the young man was limited to the fact that the air in the cultivator's territory could not breathe, and that they should carry a cylinder with them, but the secret of oxygen was never mentioned.

It's not that he doesn't trust the brothers, it's just that Xu Chen, who has always been cautious, habitually keeps the biggest secrets, and if it weren't for Yang Ziyun's "resurrection" and the surprise of discovering the biggest secret, Xu Chen wouldn't have told her these things.

Only a secret that is completely mastered by oneself can be truly impermeable, which is something Xu Chen learned from history books when he was in school.

Therefore, Shi Lei, who didn't know why, looked at Yang Ziyun blankly, Yang Ziyun was about to blurt out, but suddenly remembered the existence of the tree demon, so he stopped his mouth again.

When he turned around again, he saw that the light hole was getting smaller and smaller, so he said urgently: "If you say no, it won't work, do you still want to go in?"

Although Shi Lei was puzzled, he saw Yang Ziyun's tough attitude, so he had to bend down and say apologetically to Xiaohualu: "Then you can wait for me outside! No, go to my fourth brother, there are tigers in this place, do you know my fourth brother?" It is the cottage in the north, and you will reach ...... by turning a corner."

Seeing that the stone was still verbose, and the light hole behind him had shrunk to half the size, Yang Ziyun waved his hand, and a stream of air rolled it up, and then rushed towards the light hole.

The two people who rushed into the light hole didn't see it, and the little flower deer behind them watched the little stone body fly out upside down, and hurriedly flew with four hooves and ran forward quickly.

He also jumped into the narrowed hole of light......