Wu Weiyi's expression changed this time, not for anything else, but because he smelled an extremely strong stale smell on Mo Zhai's body.

This depressive smell may be very unfamiliar to others, but it is very familiar to Wu Weiyi:

"It's biogas!"

After his mind flew for a moment, Wu Weiyi roughly guessed the clue of this matter. In this southwestern mountainous region, the products have been extremely abundant since ancient times.

The various humus, coupled with the corpses of various animals, have accumulated over the years to form a layer of leylines formed by the accumulation of humus. In addition, every few decades, there will be a major flood here, when the heavy rain will be pouring, often causing landslides to fall, covering the humus layer in the ground.

Therefore, there is often a layer on top of each other under the ground, and when it goes deeper, it becomes black oil, which is the "fierce fire oil" used at the foot of Qingcheng Mountain before. The more superficial soil intervals are filled with biogas.

At this moment, after a major earthquake, cracks appeared on the surface, which opened the opening of the biogas overflow. When the servant strayed into it, the loose soil under it was pressed, and the bottom of the biogas was directly pressed up to the pump.

Therefore, the servant was still able to stay awake and cry out for help at first. And as the methane miasma slowly overflowed, he gradually became poisoned by the miasma. When Mo Zhai went on again, the miasma was already thick, so he also inhaled too much miasma, and this was the time when he fainted.

Thinking about this, Wu Weiyi hurriedly hammered Mo Zhai on his chest, fortunately, Mo Zhai had just entered the crack in the ground for not a long time, and after Wu Weiyi's hammering, he gradually woke up.

When Mo Zhai opened his eyes, he said in a panic:

"Brother, ...... underground"

"Brother Xian, my brother already knows. You lie down and don't move. ”

Wu Weiyi said as he paced back and forth in front of the crack in the ground with a sad face:

"There is another servant below who has not yet been extricated, and he must be pulled out as soon as possible. But now the miasma in the ground is getting stronger and stronger, and if you send someone down at this time, I'm afraid that you will really have to give one more life. ”

Just when Wu Weiyi was at a loss, his eyes suddenly fell on the vines scattered on the side, although they also belong to the southwest of China, the Shu people's textile skills are extremely high, and they can use each planting grass to make all kinds of fine ropes. However, the living habits of the servants are much rougher, and they only use this kind of tree vine as a rope in their daily life.

Don't underestimate these vines, which hang on the treetops and break when touched with a sharp object, but when moistened with forest resin, they become soft and tough, and most importantly, they are 'hollow'!

Thinking about this, Wu Weiyi suddenly had another way, but soon frowned again, and muttered to himself:

"That's not right...... Still not enough. ”

Mo Zhai had already relieved a lot at this time, and when he heard that the eldest brother was alone there, he immediately rushed forward and asked:

"I've seen my brother...... Zhai saw that his brother had picked up a piece of vine, and he seemed to have an idea? ”

Wu Weiyi turned around and saw that Mo Zhai actually got up directly, but he couldn't care about it, so he told him the truth:

"Brother Wei wants to use this hollow vine as a trachea, so as not to sink into the crack in the ground and inhale the turbidity inside. But...... But at the other end of the trachea, if there is no fresh air to send in, I am afraid that it will be difficult to hold for a long time......"

When Mo Zhai heard this, he couldn't help but be overjoyed! I saw that he slapped the door of the head, and immediately took out some small objects from the backpack he carried, and began to assemble them with local materials.

After a short time, Mo Zhai cut several leaves of wood into three sets of leaf fans, and placed them in the middle to fix them with mortise and tenon joints, and then wrapped them on the central axis with silk threads, and equipped with a copper device brought with him to pull the rope, so that it can produce a relatively strong air flow back and forth. Mo Zhai took another broad leaf, folded it into an hourglass-shaped wind cover, and put it on one end of the vine......

When Wu Weiyi saw this, he immediately laughed dumbly:

"This ...... This is ......"

Wu Weiyi's mind suddenly flashed the words "Gu Lulu" at this time. It turns out that, according to the book "Mozi", the so-called furnace is actually the prototype of the 'blower' invented by Mozi, which can be said to be the ancestor of the 'fresh air system' in later generations!

I never thought that Mo Zhai, this kid, would be able to improvise and make such an artifact according to the time and conditions under the urgency! How can this not be convincing?!

After Mo Zhai quickly assembled this artifact, he presented it to Wu Weiyi.

"Hmm...... This utensil is indeed very useful! Then use this utensil you made and the hollow vine to send the wind down, and go down to save people for my brother! ”

I saw that Mo Zhai nodded slightly, and immediately pulled up the rope, and used the 'stove stove' to blow up the wind at the end of the vine.

After the servants present heard this, they rushed forward in a swarm and sent Wu Weiyi down together. Before Wu Weiyi sank to the bottom, he could clearly smell the pungent breath, which made people's minds feel sullen for a while.

So, Wu Weiyi hurriedly took the vine in his mouth and took a sharp breath of fresh air from above, so that he finally didn't let himself faint. But at this time, the methane that sank underneath was still stinging Wu Weiyi's eyes and couldn't stop crying.

After a while, Wu Weiyi touched the servant who had been trapped in the crack of the ground for a long time, and this person had already fainted for a long time, and his chest did not even rise and fall at all. Wu Weiyi's heart sank, gritted his teeth and stepped forward, wrapped another vine around this person, and then took a deep breath and held it, and put the vine that was used as a trachea in this person's mouth.

He tugged hard at the vine again, and when the servant above got the news, he pulled the vine together and pulled the two of them up from this treacherous crack.

After Wu Weiyi came up, he saw that his eyes, mouth and nose were already choked with tears, and he looked very embarrassed.

But seeing that the two of them had escaped from their difficulties safely, everyone also cheered. Yang Asha, who had been kneeling on the side, saw this, but still said half-jokingly with him:

"Yo! Asha is still Mr. Wu, and she is really a god-like character! Why is this just a crack in the ground, but it is scared and crying? Isn't there really some ghost down there? ”

Wu Weiyi listened, but he couldn't cry or laugh. At this moment, his eyes were still red and swollen, and it was clear that he was choked by the methane. I knew she was joking, but I didn't have the time to refute him. After gasping for two breaths of air, he urged everyone sharply:

"Everyone, get out! The methane and miasma lying down there have been disturbed by us, and it would not be good if we waited for it to spread! ”

Wu Weiyi's remarks are not alarmist. If you want to talk about the methane and miasma in this crack, it has accumulated over thousands of years, and the amount is no less than the water of a river, so once it spreads from the crack in the ground, it can make this place a living thing in an instant. And this is one of the so-called "floodless disasters"!

When those servants heard this, they obviously didn't know the reason, since they had taken off the thread from the crack in the ground, why were they so nervous?

"Still stunned! Run! ”

I saw Wu Weiyi panting loudly, and shouted again:

"Quick! Run to the heights! ”

Among this group of people, it is Mo Zhai who can best comprehend Wu Weiyi's mind. Seeing Wu Weiyi's frightened appearance now, coupled with Fang Cai's own experience in the cracks of the ground, he instantly comprehended it, and his first reaction was to pull Yang Asha directly to leave:

"Let's go! Listen to my brother! ”

Those servants naturally didn't dare to ignore Wu Weiyi's warning, so they immediately ran behind Wu Weiyi and the others, but after running not far, Wu Weiyi suddenly raised a hand to stop everyone:

"Stay!"

Seeing this, everyone stopped one after another, and after a while, they heard a mixed sound in the woods in front of them, as if many insects and beasts were hurrying on the dead branches and leaves.

Slowly, the crowd saw that there were indeed many animals rushing out of the dense forest. Among these animals are tame creatures such as elk, bison, and hares, but there are also wild beasts such as wild wolves and foxes.

Moreover, these beasts, which were supposed to be natural enemies of each other, are now walking side by side like that! This kind of scene is really weird and tight.

Moreover, these beasts walked in the deep forest, and they were all twisted and crooked, as if they were drunk, which made people feel unusually crazy!

Seeing such a strange scene, Yang Asha couldn't help frowning and said:

"It's really hell, in this deep mountain and old forest, there are really demons and evil spirits, and even these beasts have become like this!"

Wu Weiyi was speechless on the side, staring ahead with bated breath, as if he was facing a great enemy.

Such a weird and bizarre scene is really very depressing, but seeing Yang Asha, she suddenly said angrily:

"Humph! What the hell is this, even these brutes are playing tricks in front of us! It's really annoying! ”

In a word, Yang Asha really rushed towards an elk in front of him! Fortunately, Mo Zhai, who was beside him, found the clue in time, and hurriedly grabbed Yang Asha's arm:

"Miss Asha! …… Cannot! ”

When Wu Weiyi heard the news, he also rushed forward very quickly and stopped in front of Yang Asha. And looked at Yang Asha with a solemn expression, Yang Asha couldn't help but froze for a moment:

Mr. Wu...... What do you see I'm doing?! ……”

However, before he could finish saying this, he saw Yang Asha roll his eyes and fall down on his back. Mo Zhai hurriedly helped Yang Asha up, and asked Wu Weiyi with great anxiety:

"Brother, Asha! …… Asha, why did she become like this? ”

I saw that Wu Weiyi had a dark and calm face, and said worriedly:

"This place is full of miasma, most of those birds and beasts are blinded by the miasma here, and at this moment they have inhaled too much miasma, I am afraid that they have already fallen into a madness! The so-called miasma, if you inhale too much, you will be confused unconsciously, and Yang Asha probably also inhaled a lot, so she couldn't hold herself, so that the ignorant fire in her heart was churning, and she lost her square inch. ”

"So it seems that now I am waiting for a swamp gas behind me, and a poisonous miasma in front of me? This...... How should this be? ”

At this time, Mo Zhai couldn't help but be a little confused, while Wu Weiyi was still staring at the front:

"For today's plan, it may only be a ruin, and the battle will be fought against the water!"

When Mo Zhai heard this, he couldn't help but be speechless:

"Huh?! What do you mean by my brother? ”

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