The sound of 'huha' came from afar, like the breath of a monster, turning into a yin wind and blowing in the face. Inside the cave is a long passage, there is nothing in the passage, and the walls of the passage are made of stone slabs and are smooth.

Sha Dutian walked in front, Zhao Ruozhi followed closely behind, was walking, Sha Dutian suddenly stopped, a small space appeared in front, the space is not large, about three or four people, and the road in front is divided into two, if you add that now they are walking a total of three roads, Sha Dutian doesn't know which one to go, he said a little unhappy: "I, a road is so troublesome."

Sha Dutian walked into the small space, and then used a flashlight to shine on the situation of the two roads in front of him, and found that there was no difference except for the darkness and quietness.

Zhao Ruozhi couldn't help the situation in front of him, he felt that the two passages were like the nostrils of a monster, and he was the food that was about to be devoured by the nostrils.

Sha Dutian stretched out his hand to feel the wind at the entrance of the cave, but in addition to the coolness, there was no wind, he took out another candle and lit it with a lighter, he put the candle on the left hole, the flame of the candle did not shake at all, he put the candle on the right side of the hole, the flame was slightly tilted.

He blew out the candles, knocked on the wall of the passage on the right with a pestle, and said, "We are going this way, and the wind is blowing on this road." ”

Zhao Ruozhi agreed, there is no air pressure on the dead end, and there is no air flow, and if there is air flow, it means that the road is open, but is it safe to lead to the outside road?

Zhao Ruozhi took out the water, since he entered here, the dripping water has not entered, the sound of the cooing sound is like a heartbeat, he pursed his lips and said: "Lao Sha, I have always wondered, who will dig the passage under my cellar, I think the road we are taking now is the real way in, since the place where the black box is guarded is full of mechanisms, so this way in?" ”

Sha Dutian was drinking water, and he choked all of a sudden, and kept coughing: "Don't always say such bad things, maybe we'll go out soon... Uh", he stopped again, there was a small space in front of the road, Sha Dutian walked into the space, and there were two roads in front of him, he wondered: "Damn, what is the situation?" ”

Sha Dutian was about to take out the candle to explore the path again, but Zhao Ruozhi stopped: "Lao Sha, wait a minute, these roads are very strange, maybe they are connected, your candle path exploration does not work, let's continue to walk forward to see the situation." ”

I didn't go far, it was a small space, and there were two roads ahead. Shadutian brought some lime in his bag, and every time he went to a small space, he sprinkled a handful of lime as a mark, I don't know how long he walked, Shadutian lime was used up, and he still didn't see the exit, and they were also a small space in front of him, and the structure was exactly the same as the one he encountered before.

Zhao Ruozhi was also dizzy, he would definitely be trapped here if he continued like this, he thought of the lime left by Sha Dutian, and thought that if he returned to the starting point and re-walked this labyrinth, he might find something new.

Zhao Ruozhi said tiredly: "Lao Sha, in the current situation, I think it's best for us to go back to the starting point of entering this cave first, maybe we can find a way out." ”

Sha Dutian said: "Fortunately, I brought lime and marked it on the road, and we followed the same way back, maybe we really found something." ”

As soon as he walked through two small spaces, Sha Dutian's flashlight went out, and he tried his best to clap the flashlight with his hand, hoping to turn the flashlight on, but unfortunately the flashlight struck, and he muttered: "What a broken flashlight, how long has it been before the food is off." ”

Zhao Ruozhi handed his flashlight to Sha Dutian, Sha Dutian put away his flashlight, and just took Zhao Ruozhi's flashlight and was about to walk forward, he suddenly found that the lime he had sprinkled was gone.

Sha Dutian gasped, he bent down, his eyes widened, he couldn't find a trace of lime, he was terrified, could it be that this lime ran away with long legs?

Zhao Ruozhi saw Sha Dutian's abnormality and asked, "What's the matter, Lao Sha?" See a baby on the ground? ”

Sha Dutian straightened up and said, "It's really evil, the lime I sprinkled is gone." ”

Zhao Ruozhi was also startled when he heard it, and he looked at the place where Shadutian's flashlight shone cleanly. Lime is powdery, how could it be that it disappeared for no reason? Could it be that someone deliberately cleaned it up? Even if someone cleans it up, it should leave a little trace.

Sha Dutian illuminated several passages in the space with a flashlight, but there was no movement, and he said vigilantly: "Could it be that there are people in this cave who deliberately let us be trapped here?" ”

Zhao Ruozhi said thoughtfully: "If there is really someone, since he can come and go freely in Liandong, then there must be something special about this Liandong that has not been discovered by us, and now that the lime is gone, we can only rely on our judgment." ”

Sha Dutian said a little angrily: "This bird cave is the same, how can we judge?" He was trapped in the cave for too long, and the lime sprinkled was still inexplicably gone, and he was inevitably a little impatient.

Zhao Ruozhi was very calm, he put his backpack on the ground, took out a roast chicken from the bag, tore open the seal, pulled a chicken leg and handed it to Sha Dutian and said: "When people are hungry, it is easy to affect judgment. ”

Sha Dutian thought about it for a while, took the chicken leg and said, "Don't say it, I'm really hungry." As soon as he went down, he bit off half of the chicken leg, and the smell of roast chicken wafted through the space. Sha Dutian opened his backpack and took out the wine dug in the cellar, he opened the cap of the bottle, and the aroma of wine wafted in, the fragrance overflowed, and he was full of energy in one sip.

After they were full of wine and food, they began to discuss how to get out, Sha Dutian said: "If we want to go out, we must find out what the whole of this hole is like, and now we can draw it, if there are all the same small spaces, each small space is a circular hollow, divided into three paths, now with the hole we are in as the center, we will walk through the three roads of this hole, count the steps, and we should be able to draw its rough structure." ”

Zhao Ruozhi agreed with Sha Dutian's idea very much, but he didn't expect this guy's IQ to improve so quickly after he was full of wine and food.

According to Sha Dutian's method, there is a small space every ten steps, and the three roads of each small space are to walk ten steps to reach another small space, and most of the passages are straight, Sha Dutian drew a basic figure, and the four small spaces are connected in a straight line to be a square, and each corner of the square is connected to another square.

Sha Dutian showed a hint of excitement and said: "Mentally retarded, this hole is like a labyrinth composed of many squares, now we only need to find a small space with only two roads, maybe we can find a way out." ”

Sure enough, it didn't take long for them to find a small space with only two roads, and Sha Dutian was overjoyed and said excitedly: "I really guessed it." ”

Zhao Ruozhi looked dazed, although he really found a small space with only two roads according to Sha Dutian's practice, how did he know that he could get out?

Sha Dutian drew a figure on the ground with a fire pestle, first drawing a regular octagon, drawing a square with one side of the square as the side, drawing a square every other side, four squares sandwiching the middle octagon, and then using the other sides of the square as the sides of the other regular octagon, and so on.

After Sha Dutian drew the figure, he pointed to the outer edge of the figure with a fire pestle and said: "There is always an edge to this labyrinth, according to our measurements and calculations, there can only be two roads in the small space at the edge. ”

Zhao Ruozhi was convinced, but he still had a question in his heart, and asked: "Since we have found a small hole with only two roads, then how can we get out, according to the diagram you drew, there are two small spaces on all sides of this labyrinth, how can you determine where we are now?" ”

Sha Dutian was slightly stunned, he ignored this, he said: "This, we only have to try our luck." ”

Zhao Ruozhi smiled slightly and said, "It's a reliable way to try your luck, but..." He paused for a moment, fell into thought, his eyes were firmly fixed on the picture drawn by Sha Dutian, not knowing what he was thinking.

Sha Dutian heard Zhao Ruozhi say half of what he said, and hurriedly asked, "But what?" ”

Zhao Ruozhi squatted down, gestured on the map with his hand and said: "Look, according to the picture you drew, we came from a small space with three roads in front, and this small space with only two roads was walked over by us in the right-hand side passage of the small space of the three roads, so no matter where we are now, as long as we encounter a small space of three roads, we will all go to the right hand side or the left hand side, and if we encounter a small space of two roads, we will go straight and we will definitely be able to go out." ”

Sha Dutian understood Zhao Ruozhi's thoughts, he gestured on the map with his hand, according to Zhao Ruozhi's statement, he would indeed be able to walk out soon, he said excitedly: "Then what are we waiting for, rushing towards the dawn of victory." ”

Zhao Ruozhi never understood how the lime scattered by Shadutian disappeared, and since he had a way to get out of trouble, he didn't want to do so much, so it would be better to leave this place of right and wrong as soon as possible.

According to the route reasoned, Zhao Ruozhi and Sha Dutian passed through one small space after another, this hole is not more complicated, and there is no fatal mechanism, Zhao Ruozhi is very glad that this designer is just to trap the intruder, and did not hurt the killer, otherwise it would be miserable.

In fact, Zhao Ruozhi and Sha Dutian were already very close to the exit, but they were in the cave, and they didn't know which side was the exit, so they could only follow the preset route all the way.

An hour later, they walked to a small space with three roads, keep to the right, this time they walked for a long time and did not see other small spaces, Sha Dutian knew that they were going to get out of the hole, and suddenly felt very lucky, according to the preset route for so long, if you go blindly, you have to be tired and starved to death.

After walking for another ten minutes, Sha Dutian saw a spiraling staircase, the stairs were all made of long stone strips, he did not step on the stairs, but carefully shone it upwards with a flashlight, and at this moment, a skull flashed in front of him.