Gradually, more than 100 zhang of ruined buildings are shadowed in the night, like hideous monsters.

The remnants of the building are covered with dark green vines, the thick vines swaying slightly in the night wind, really like a wriggling giant snake, a few amazing wild flowers are mixed in, swaying with the wind, indescribably delicate.

"Hey, here's ......," Yang Ziyun called Xu Chen.

Xu Chen, who was patronizing and looking down for vegetation, raised his head, and was also shocked by the scene in front of him, and muttered, "This is ......"

"Let's ...... Shall we go back?"

It wasn't for why, Yang Ziyun felt a faint danger in her heart...... Or maybe it's just too quiet.

"This ......"

Xu Chen also has no habit of taking risks, although the oxygen in this ruined city is beneficial and harmless to them, but in this mysterious area that has been stored for thousands of years, it is difficult to guarantee that there are no other dangers.

"Or ...... If it's dangerous, run faster!"

Xu Chen said lightly, but in fact, he couldn't suppress the curiosity in his heart.

Yang Ziyun had no choice but to lean up, and if something happened, she would come to the rescue.

Xu Chen smiled, took the girl's hand again, and walked into this wide, mysterious dilapidated temple step by step.

Unlike the path that was full of fine sand just now, there were still a lot of huge stones and timber left in this ruined temple, and they were also covered with vines.

"It seems that the materials used in this building are extraordinary! this place must have been a very important place back then!" Xu Chen put aside the vegetation on the surface, looked at the stones that were still a little shiny below, and secretly guessed.

After walking for half an hour, Xu Chen approached the remnant building of more than 100 zhang, and the empty place before was like a courtyard square.

When he got closer, he looked up, and the towering remnants of the building brought Xu Chen a sense of oppression even more.

The remnants of the buildings are stacked on top of each other, and the teleportation formation has long been abolished, and at this time, apart from these winding vines, I am afraid that nothing else can reach the upper floor.

"Hey, this is ......" Xu Chen looked up for a while, then lowered his head and continued to search, and suddenly saw a pile of plants more than three feet high.

Each plant only grows three or two, the leaves are wide at the bottom and narrow at the top, like an upside-down sword, and the leaves are covered with circles of patterns, with a faint yellow, like tiger stripes.

"Tiger Tail Orchid!" Xu Chen was startled and quickly ran over.

"No wonder...... No wonder the area of this ruined city is getting bigger and bigger!"

Although the environment of tiger tail orchid is higher than that of cactus, and the cultivation is more difficult, it is a natural oxygen generator that claims to be able to continuously produce oxygen in the dark night, and the oxygen production effect is of course much higher than that of other plants.

Xu Chen searched all the way, and the leaves of the tiger tail orchid became longer and longer.

"Look, there seems to be an underground palace there!" Yang Ziyun pulled Xu Chen and pointed not far away.

"Let's go, go over and have a look!" said Xu Chen, and then pulled the girl over.

There is indeed a dungeon, the door of the dungeon is now wide open, the years are ruthless, even the most powerful formation can not escape the erosion of endless years, looking at the carvings on the two fallen stone doors, Xu Chen sighed in his heart.

After entering from the gate, the corridor has already become a paradise for plants, and the lush vegetation makes it difficult for Xu Chen to walk.

Walking through this difficult road like thorns and thorns, Xu Chen came to a wide place, which was said to be wide, but now it was already stuffed with all kinds of plants, and several unusually thick rhizomes stretched out from the soil, all the way up, and actually penetrated the dome overhead, and it seemed that the dense vines on the remnant tower actually extended from here.

"There are so many tiger tail orchids!" Xu Chen looked around, his eyes were full of sword-shaped leaves, some of which were several feet high, and the whole plant was also amazingly large, like a giant tree.

"This place, maybe you can ......" Xu Chen looked at the large number of oxygen-producing plants around him, and thought in his heart.

Just do it, Xu Chen let go of the girl's hand and took off the jade pendant around his neck.

"Help me hold it!" Xu Chen handed the jade pendant to the girl on the side.

"What are you going to do?" Yang Ziyun wondered.

"Do a test and see if this place can make us breathe normally. Xu Chen replied.

"Oh, be careful, then!" Yang Ziyun admonished.

"Yes!"

After speaking, Xu Chen let go of the hand that had been touching the jade pendant, exhaled slowly, and then inhaled......

"Haha, sure enough!" Xu Chen's eyes lit up.

"There is plenty of oxygen here, even more than the outside world!" Xu Chen took a deep breath, feeling relaxed.

"It's finally time to do it!"

As he spoke, Xu Chen took off the package on his back, found a relatively flat big stone, and put all the things on it.

Xu Chen, who took out a small clay pot and poured a little gunpowder, was lighting the fire, but remembered the scene in the real room under the antwolf's nest that day, and couldn't help palpitating, and poured out most of the gunpowder, leaving only a piece the size of a fingernail.

The fire was lit again, but this time the flame on the small stick only flashed for a moment before disappearing.

Xu Chen was not too surprised, and slowly leaned his hand over: "Fortunately, the temperature is still there!"

As he spoke, he threw the small wooden stick into the clay pot.

This time, there was finally a reaction!

The sound of "snort" sounded, and the clay pot cracked in an instant!

Not only this small clay pot, but even the big stone below began to show a crack, and the crack continued to spread, and the crack became bigger and bigger!

"Not good!"

The scene in his memory seemed to be about to reappear, Xu Chen hurriedly retreated, took the girl's hand, and was about to flee from the road, after retreating a few steps, Xu Chen heard that the "click" sound of the stone cracking became more and more slight, and finally disappeared.

"Huh?" Xu Chen looked back, but the stone was now silent.

Carefully walked back, carefully observed the big stone, but saw that the original smooth and flat surface of the big stone has long been grooved and horizontal, and the cracks are deep into the inside of the big stone, black and swarthy, and the depth cannot be seen clearly.

"Maybe it's because the amount of gunpowder isn't much......" Xu Chen speculated.

I am very glad that I poured back most of the gunpowder just now, otherwise if there is a big disturbance, even if I can successfully escape, it will not be easy to explain!

After the fact, Xu Chen said happily: "Haha, it seems that there is no problem with the materials!

Without any equipment on hand, in this world where strength is respected, Xu Chen has no sense of security at all, and now he can copy the hand thunder, which can also make him feel a little more at ease.

Xu Chen is loading gunpowder into some small clay pots he brought, now there is no glass, can not make a ring ignition device, Xu Chen had to stuff a flammable hemp rope into it, left and right only need to pass the high temperature into it, in the clay pot, there is a lot of oxygen stored in the gaps of the gunpowder, as long as the high temperature can be conducted, combustion will occur, and the explosion will follow.

Xu Chen, who was busy with his hands, suddenly noticed the hollow steel pipe he brought casually. After pondering for a while, Xu Chen held it up.

"This thing...... Does it really work?"

The reason why the thunder can cause more power than the outside world in this area is that it is very likely that the strong oxidation reaction produced at the moment of the explosion is that all the materials that cannot resist oxygen in this area are decomposed.

If so, can the hollow steel pipe in your hand really withstand the strong oxidation reaction produced when the gunpowder is burned?

If, like this stone, a little bit of gunpowder can crack it, then what's the use?

"No matter what, you have to try it first!" Xu Chen pondered for a while and decided to give it a try.

In the same step, a small amount of gunpowder was poured into a hollow steel pipe, and a lit wooden stick was put into it.

The sound of "snort" continued to sound, and the hard-looking steel pipe cracked quickly......

"Sure enough, it doesn't work!"

Looking at the hollow steel pipe on the stone that was only half left, like someone had gnawed it, a strong frustration struck, hope and disappointment, even Xu Chen, who was tenacious, was inevitably depressed.

"What's wrong?

Yang Ziyun on the side saw that Xu Chen stopped his movements, his expression was depressed, and the hollow steel pipe that he regarded as a treasure was dilapidated at the moment, so he asked.

"Alas...... It still doesn't work! It seems that if you want to make something like that, you need to use another way!"

Xu Chen shook his head slightly, cleaned up his things, and put them on his back again.

"Let's go! Looks like there's nothing special here!"

If you want to come here, there won't be any animals here, otherwise I'm afraid that it would have been cleaned up by the people of the City Lord's Mansion a long time ago.

On the way back, Xu Chen remained silent.

"Didn't the thing come out?" asked Yang Ziyun on the side with concern.

"That's not true, Hand Ray still made a few, but the thing that was originally expected is not working now...... Xu Chen sighed.

"Is that steel pipe of bad quality?" The girl is also a psychic person, and when she saw the scene just now, she guessed the reason.

"Yes, it's not just the steel pipe, the steel in this place is not the same as the outside world, and I can't make what I want with the steel here......" Xu Chen explained to the girl, and suddenly fell silent.

"That's right!" Xu Chen slapped his palms and said with a smile: "I can't use the steel here, so I can just use the steel from the outside world!"

"No, no, no, the steel from the outside world can't meet the requirements...... Xu Chen shook his head suddenly, and after a while, he muttered: "Maybe you can transport the iron ore from the outside world here, and then use the smelting technology here to make qualified steel to ......."

"But in this case, there will be more trouble! There are not enough key people, so you can't do it alone, right? But if you want to transport a large number of people in, there are only two pieces of jade pendant, and how can they breathe without oxygen?"

"Huh, maybe you can send someone to this ruined city?"

"That's right, especially in that dungeon just now, the concentration of oxygen is even higher than that of the outside world! It can indeed be used as the best foothold, but it ...... How easy it is to enter with a large number of people without attracting attention!"

Xu Chen thought as he walked, his mouth kept muttering. Anyway, he didn't mean to hide it from Yang Ziyun.

It's just that the girl on the side didn't hear all these soft words clearly, but another person here, relying on his advanced cultivation, heard all the words after Xu Chen walked in.

"Do you want to bring in a lot of men? What people? Wild people from the wild lands of the outside world?"

Hearing this, Xu Chen and the others were shocked. R1058