In order to save power, Ziyang and the others turned the lights to the darkest, and from a distance, three small bright spots were like fireflies, moving slowly in the boundless darkness. As he walked, Lao Wang knelt on the ground with a puff, "No, I really can't walk, I'm tired!" ”

"Take a break!" Ziyang was also exhausted from walking, and the two were trembling.

More than 20 hours have passed since Qin Xianghe detonated the explosives, and Lao Wang, Ziyang, and Su Rui have waded through the "mountains" in the dark and tortuous underground labyrinth, and they have lost count of how many waterways they have crossed and how many rock walls they have climbed.

Su Rui sat on the ground, took out an energy bar from his bag and handed it to Ziyang: "The last one." ”

Zi Yang carefully broke the energy bar into three pieces and divided them into pieces, and Lao Wang took his share and stuffed it into his mouth, almost swallowing it without chewing.

Ziyang put his piece in his mouth and chewed it slowly, and after chewing, he carefully rubbed it between his teeth with the tip of his tongue, trying not to waste a little residue.

After eating this energy bar, they really ran out of food.

"Are we on the wrong track? I feel like I've been walking for most of the day, and I feel like I've been going around in circles underground. Ziyang's confidence began to waver.

Lao Wang also said: "That's right, at least I've walked a few hundred kilometers, why can't I see the end?" If you go any further, you will even walk through the earth! ”

Ziyang knew that a few hundred kilometers was an exaggeration, but one or twenty kilometers was always available.

The two looked at Su Rui together, not knowing what this genius beauty thought about the current predicament.

Su Rui clasped his knees in his hands and muttered, "I didn't expect this underground cave to be so complicated, what I'm worried about now is not that there is no exit, but that we have stepped into the 'Möbius Belt'." ”

"What's the five?" Lao Wang asked weakly as he lay on the ground.

"The Möbius Belt, a physical model. The German mathematician Mobius discovered that after twisting a strip of paper by 180°, the two ends are connected to make a paper tape circle, which will produce a magical effect. If you put a worm on it and let it follow the note, it will never end. ”

"What do you mean? Didn't understand. Lao Wang opened his two ignorant eyes and looked confused.

Su Rui drew a three-dimensional figure on the ground: "An ordinary strip of paper has a curved surface on both sides, one front and one back. And the front and back sides of the Möbius belt are on the same side - or it has only one side, and the worm walks on it, and it will only repeat the cycle, but it will never touch the end - the Möbius ring has no end. ”

Ziyang gasped, "I see, what do you mean that this underground labyrinth is a Möbius belt, and we are small worms walking in it?" ”

Su Rui nodded solemnly.

Lao Wang turned over and stood up: "Lao Tzu doesn't believe that there will be a road in this world that can't be walked through, what a broken loop!" Wouldn't it be okay to poke a hole with a pen, what kind of circle! Why do you spend so much trouble! ”

Zi Yang sighed: "You think you're a pile driver?" Do you have the strength of an overlord salamander? ”

Lao Wang tilted his head and thought about it, he really didn't have the strength, and held his head with both hands and said distressedly: "Is this the end?" Xiao Su, you have to think of a way, aren't you a genius? ”

Zi Yang also looked at Su Rui with hopeful eyes.

Su Rui hesitated for a moment and said: "It's not that there is no way, now we have several options: the first is to cross the border of the Möbius belt. ”

"How?"

"As the king said, directly destroy the Möbius belt. But we don't have the right tools, so it's hard to do that. ”

Lao Wang sighed and said: "Xiao Su, it's all come to this point, let's stop popularizing knowledge, just talk about how to get out of this broken circle." ”

Suri continued: "Physically, there is a straightforward way to get out and find where the Möbius ring begins. ”

The question is, where to start? There's no sign in this place! Ziyang thought with a sad face.

Lao Wang lowered his head and thought for a while, and suddenly his eyes lit up: "I know where it is!" That's where the overlord salamander broke through the wall, right? ”

Su Rui nodded: "I also suspect that it is there, but I can't be sure." ”

Zi Yang hung his head and said, "Don't think about it, even if that's where it started, the question is can we still find our way back?" Even if we remember the road, do we still have the strength to walk back? ”

The three of them looked at each other, and it was clear that the answer was no.

"Xiao Su, Xiao Su, think about it, is there any other possibility?" Lao Wang squatted beside Su Rui and asked anxiously.

"There is another possibility: this ring is not closed, and there are other ways out."

"Definitely? Don't coax my old king to toss around for a long time, I really can't last that long. This broken submersible weighs at least a few hundred pounds......"

"Keep going, at least we haven't encountered a duplicate path yet, have we?" Su Rui gave Lao Wang an encouraging look.

Zi Yang knew that in fact, they couldn't remember whether there was a way back, and most of the roads in the dark underground space were similar. It's just that this kind of frustrating words are better pressed in the bottom of your heart, and it hurts morale too much to say it.

The three of them lifted their spirits and staggered forward in the narrow and slender gap, Ziyang looked up, and the crack became narrower and narrower the higher it went, as if there was no end in sight.

"There's no power! Grass! Lao Wang patted the diving lamp on his head, and the diving lamp on Ziyang's hand gradually turned yellow and dimmed.

Su Rui adjusted the miner's lamp in his hand to a gentle brightness, barely able to illuminate the surroundings, and the three of them walked one foot deep and one foot shallow.

"Oops!" Lao Wang suddenly exclaimed, fell to the ground on his back, because of the heavy respirator on his back, Lao Wang was like Wang Ba who only landed on the ground, paddling his hands and feet, and he didn't get up for a while.

Zi Yang hurriedly stepped forward to help him, but who knew that his feet slipped, and he slipped and fell.

Zi Yang only felt that his hands had touched a layer of sticky things on the ground, and when he put it in front of him, it was a black and mud-like thing.

"Got oil?" Lao Wang finally turned over, looked at Ziyang and said. His hands and body were also covered with black "mud".

Su Rui sniffed it and said, "No, it's animal feces." ”

"Nest grass!" Lao Wang and Ziyang smeared the feces on each other's bodies in a panic. His hands were wiped clean, but his body was a mess.

"Grass, what's pulling such a big piece of?" Lao Wang scolded and said, under the light, you can see a layer of black feces on the ground.

"What you should be concerned about is, how did this thing get it!" As soon as Zi Yang spoke, the three of them looked up together. There are also scattered patches of thin on the rock wall.

Su Rui twisted the brightness of the miner's lamp to the highest, and he could vaguely see that something seemed to be squirming dozens of meters above.

"Nest grass!" Lao Wang sighed again, and the thing above seemed to be alarmed, and suddenly rushed down!

"My mother!" Lao Wang shouted, and he hugged his head first. Su Rui and Ziyang followed behind and ran lifelessly. All I could hear was the huge black shadow fluttering overhead, as if it were colliding on the rock wall.

Fortunately, this crack is relatively narrow, and the mysterious creature seems to have difficulty moving in this small space, and it can't catch up with them for a while. The three of them sprinted for a while, and finally broke through the crack, and an open area appeared in front of them.

The three of them were panting and lying on the ground, only to feel that it was difficult to breathe, their legs were sore and swollen, this sprint consumed a lot of physical strength, and they could no longer run.

Fortunately, the monster did not chase out of the crack in the rock, it seemed to be stuck somewhere inside, and everyone could only hear the sound of rattling from the huge crack, as if the stones in the crack had been knocked and rolled down.

"Oh, I—I'm really going to run anymore, I can't run anymore, just die, die here!" Zi Yang lay on the ground and said weakly, only to feel that his heart was beating like a drum, the Venus in front of him was scurrying, and the two temples seemed to be knocked with a small hammer.

"How easy is it to think and die? In case that monster catches you and raises you, eat ...... little by little" Lao Wang was saying, when suddenly a strong gust of wind above his head pressed down, and the three of them breathed sluggishly, and a huge black shadow claw had already landed on Zi Yang's back, and he was grabbed by force.

After the monster caught Zi Yang, it flew up, Lao Wang and Su Rui were blown by the strong wind from its wings, and Zi Yang's body was instantly lifted up for more than ten meters. Lao Wang couldn't care about anything else in a hurry, so he took out the dogleg scimitar on his waist and threw it over.

The heavy dogleg scimitar arced through the air, poofed, and stabbed into the monster's chest impartially. The monster screamed miserably, dropped Ziyang and flew out more than ten meters crookedly, crashing headlong on the mountain wall next to it and rolling down crackling.

Su Rui hurriedly rushed forward to help Ziyang who had fallen to the ground, and asked anxiously, "You, are you okay?" ”

Zi Yang fell from the air of more than ten meters, was dizzy, and said breathlessly: "He, why am he unlucky again?" Who am I recruiting, who is messing with me, me every day! Why am I so sad? ”

Lao Wang ran to the place where the monster fell, and saw that the huge flying monster had broken its wings, its neck was broken, its bones were exposed, and the dog-legged scimitar was deeply embedded in its chest.

Seeing that the flying monster's chest and abdomen seemed to be rising and falling slightly, Lao Wang pulled out the dog-legged scimitar and stabbed it again, and after confirming that the flying monster was completely breathless, he ran back excitedly, and shouted to Ziyang and Su Rui: "There is meat to eat, there is meat to eat, Lao Tzu stabbed a big bat to death!" ”

Zi Yang and Su Rui looked at each other: Big bats? What kind of bat can catch a hundred or dozens of pounds of people in the air?

Su Rui carried Ziyang to the corpse of the flying monster, and took a closer look at it with a miner's lamp and couldn't help but be surprised: Where is this bat, it's obviously a gargoyle!