After several hours of climbing, everyone was tired.Yu Chengjun slowed down, and the old ghost kept complaining that his rheumatism seemed to be about to attack.Even though he was wearing a diving suit, his hands, knees and other parts that had been rubbing against the ground for a long time began to hurt, especially Ye Li, because he was not used to this kind of behavior, and every step was extremely difficult.

Jin was keenly aware of the fatigue of the crowd, and at the same time was surprised that his body did not feel any pain or fatigue until now. He probably became numb to pain after becoming a zombie. Those who watched zombie movies would not die no matter how much they hacked. stiff

The corpse knew that if it was him who was pampered and raised during his lifetime, he would probably fall to the ground after climbing a few meters.

Jin thought for a while, then gently grabbed the ankle of Yu Chengjun who was advancing, and shouted: "Jun..."

Little did he know that such a move would cause quite a violent reaction.

Yu Chengjun has been trying to let himself go, forcing himself to focus on the work in front of him.He knew that Jin was hurt by his indifference, and even Yu Chengjun was disgusted by his indecision, but he couldn't make a sudden decision. At this moment, he couldn't be sure whether his feelings for Jin could be called... I don't know how to define this feeling.

Fortunately, there are other things to be busy in front of him, so Yu Chengjun can temporarily put aside the relationship problem.He could also see that Jin was suppressing something. Although he felt sorry, he still chose to escape.Now that he hadn't sorted out his thoughts and feelings, the mere presence of Jin was enough to bother him, let alone physical contact.

So when Jin's hand touched his exposed ankle, Yu Chengjun jumped up like a frightened horse, and hit his head against the rock wall.

This solid bump surprised everyone, and Ye Li, who was crawling behind Jin, took the lead in attacking Jin's ass with a breathing tube for snorkeling, cursing: "Hey, you Don't make sudden moves, it will scare people, don't you know?!"

"Yes, I'm sorry!" Jin apologized in a panic.

Yu Chengjun clutched the painfully bumped Tianling Gai, and also felt that he had lost his composure, but he was even more embarrassed to face Jin, and without turning his head to hide his embarrassment, he stammered: "No, nothing..."

The ghost old man was at the end of the line, and he didn't fall behind in cursing. He said, "You're not too young to be so frizzy. I just slapped you and frightened you like this... It's really embarrassing to me."

"I'm sorry, Jun." Kim apologized again, "I was just wondering if you guys needed to stop and take a break."

"Where have we been?" asked the ghost old man.

"This secret passage faces southwest. Although the GPS cannot receive a signal, we should still be within the boundaries of Benxi City."

The old ghost thought for a while, then frowned and said, "You mean we're going to the southwest now? Doesn't that mean we're going to Qianshan?"

Yu Chengjun wanted to talk to the old man Gui, but when he turned around, he saw Jin Zheng looking at him, so he turned back quickly. "This road was not dug along the terrain, I think it should lead to other places."

Jin's ears twitched suddenly, and he said, "There is the sound of water ahead."

"What sound of water?" Ye Li asked inexplicably, "I didn't hear anything?"

Jin leaned forward and pressed his ear against the rock wall. "There is really a sound of water, it should be not far ahead...and the sound is getting louder..."

"We're not taking a detour, are we?" The ghost old man shouted at Yu Chengjun: "Stupid apprentice, if you go back to the water hole later, I won't let you go!"

Yu Chengjun frowned and said, "How is it possible to go back? Master, my concept of direction is much better than yours, that's why I am responsible for navigating every time I go to the ground."

When it was said that he was in pain, the old ghost almost jumped up. "Didn't you know that there are things in some tombs that make the compass useless? When the time comes..."

"Shh..." Jin almost pressed himself against the wall. "There is really a sound. If you don't believe me, listen to it. It's getting closer."

Yu Chengjun imitated Jin and leaned on the rock wall. "It seems that there is really a sound of water... Could it be that this road leads to other underground rivers?"

Jin suddenly jumped up like an electric shock, and regardless of whether Yu Chengjun minded, he grabbed him and dragged him back, shouting: "Climb back quickly! The water... is about to rush over!"

Everyone was shocked when they heard the words, but no one responded for a while, as if they were dubious about Jin's words.

It was the first time Yu Chengjun saw Jin's frightened and frightened expression, and before he had time to judge its credibility, he shouted, "Master, climb back quickly!"

The old ghost was stunned for a moment, and then he turned his head and cursed as if he had just woken up from a dream: "We are so unlucky, we crawled through a mouse hole, and even climbed into a sewage pipe!"

Ye Li also turned around in a hurry, but the burden on his feet seriously hindered his movement.

"Old man, don't talk nonsense, if this is a sewage pipe, then we will be washed down..." Ye Li couldn't say that word no matter what.

Yu Chengjun suddenly felt a chill all over his body, and when he looked down, he found that the water was coming from behind him, and it was rising rapidly.

He knew that it was absolutely impossible to dodge them in their position, so he shouted: "Hold on tight and don't lose the scuba tank, the water is raging, if you lose the oxygen tank, your head will explode if you hit it!"

Before he finished speaking, he heard the sound of intense water rushing from behind.

The ghost old man and Ye Li in front also heard it, and hurriedly put the oxygen bottle on their backs and put on the frog mirror.

In just a few seconds, the torrential water hit them mercilessly.Before Yu Chengjun could feel the coldness of the water, he was thrown up by the current and hit the rock wall with his whole body.Then, the water roared and rushed them forward, and even with frog glasses, they could only see white waves rolling.

Yu Chengjun felt that he was like a goldfish in a plastic bottle, thrown to pieces by the current, so he could only hold his head as much as possible to reduce the impact.After I don't know how many times I hit the rock wall hard, the water seemed to have finally found an outlet. The sudden feeling of falling made Yu Chengjun panic, and then with a "plop", he fell into a pool of water.

The acceleration of gravity of the fall made him sink straight into the water, but he quickly came back to his senses. When he felt his feet hit the hard ground, he kicked hard, and then swam upstream in one breath.

After surfacing, Yu Chengjun spit out the air and greedily breathed in the fresh and humid air, but in just a few seconds, he felt as if he had walked back from the gate of hell.Yu Chengjun looked around and found that this was not the water cave they had just passed by, but he was in a cave he had never seen before.

The pool he was in was at the corner of the cave, and the cave could be seen from the bank in front of him. The cave in front of him was quite straight, deep and endless.

About seven or eight meters away from the wall of the cave behind him, the water kept flowing down from there, and it should have fallen out of the cave just now.Immediately, he thought of other people, and looked left and right to find their traces.

Immediately, a shadow floated on the surface of the water below the water column, it was the ghost old man!

Yu Chengjun hurriedly pulled him over and patted the old ghost coughing loudly on the back while looking for Ye Li and Jin.

He and old man Gui are very experienced and they are in such a mess, then Ye Li and Jin are probably...

A figure suddenly surfaced and shouted, "Jun, come and help me! I, I can't come up!"

It was Kim, holding another thin figure in a wetsuit.

Jin paddled the water hard with one hand and hugged Ye Li with the other, trying to float on the water as much as possible.

After Yu Chengjun confirmed that the old man Gui could go ashore by himself, he swam over to pick up the unconscious Ye Li, and dragged him ashore.

After everyone went ashore, Yu Chengjun hurriedly checked on Ye Li's situation.

"Little Yezi just drank a few sips of water, so he shouldn't have been hurt." Jin panicked, "I grabbed him just now when the water rushed in."

Yu Chengjun lay on Ye Li's chest to confirm that his heart was still beating, and then performed artificial respiration after cleaning the accumulated water in his mouth and nose.After a while, Ye Li opened his eyes and started spitting water.

Yu Chengjun helped him to sit up.Ye Li coughed for a while, then raised his head and looked around, he was obviously relieved when he was sure that everyone was there.

"What the hell is this place?" Ye Li asked in surprise.

Only then did Jin notice the surroundings, and said in a fuss, "Yeah? Isn't this a water hole?!"

"You are really slow, little zombie." The ghost old man shook his head and said, "We have crawled in that cave for several kilometers, how could we go back after just a little rush of water? If it returns to the water cave, it is estimated that we are still soaked in the water now. .”

"Could we have touched the agency?" Yu Chengjun asked.

The old ghost stood up and walked into the passage. His voice echoed in the cave, "It's very possible. I haven't seen any other forks or holes after climbing for so long. Why did I come to this strange place as soon as the water rushed... By the way, this mechanism It’s really ingenious, and it must take a lot of work to build this thing in a scenic spot with so many people.”

"I think half of this mechanism may be natural." Yu Chengjun put down the things he was carrying, and groped around the rock walls.

"What do you mean?" Kim asked, tilting his head.

"The passage we just climbed was dug by hand. It can be seen that it has been there for a while, and it probably existed before the water hole was opened."

Yu Chengjun recalled the doubts he had when he climbed the mouse hole. There are quite obvious differences between the front and rear sections of the tunnel: moss grew on the rock wall in the front section, but there was no moss in the back section; and the rock wall in the back section was much smoother than the front section. , should be the result of water erosion.He doesn't think that dark hole will be used frequently, so it can be judged that the water flow that appears there is not caused by triggering the mechanism, but...

"A geyser was discovered at Tianlong Cave, the source of the water cave in Benxi, and I think the water flow just now should be the same, but a long time ago, someone set up a mechanism to activate the water flow, and then led the spring water here, so there is no People discovered that there are other geysers underground." Yu Chengjun mused.

"Damn it took so much trouble... The scale of this underground cave may be much larger than what you can see." The ghost old man's eyes glowed, "We are really lucky, we met the time when the geyser erupted, or we climbed to the end If you turn back and turn back, you won’t know the mystery here.”

"So, Master, are you going to move on?"

"Nonsense, I don't want to return empty-handed. Now that we've come here, why not go on? I think Professor Luo has probably discovered the mystery of the mechanism here, so he probably thinks it's impossible for us to find out, so we dare Disappearing in the water hole so blatantly. I'm sure he must have come here."

They spent some time warming their bodies that were almost frozen due to the spring water, and when their fingers were no longer trembling due to the cold, the old ghost couldn't wait to kick Ye Li who was still sitting on the ground, and urged: "Go, let's go!" There is only one road here, if you sit all the time, your valuables will not fall off.”

This man-made cave is quite long and tortuous, as if the original diggers were trying to obscure the sense of direction of the people walking in it.The corridor is a bit narrow, although the tall Yu Chengjun and Jin have to lower their heads slightly to avoid bumping into a zombie falling in love with you.Descend to the ledge, but it's more satisfying to be able to keep your feet on the trail than the rat hole you just climbed through.

The ghost old man, who had always hated this kind of long march-like walking, uncharacteristically didn't complain, and walked at the front with great interest, and his brisk walk could not tell that he was a centenarian.

This time, Yu Chengjun was very grateful to the old ghost for his impatience.Because of the rapid progress, Yu Chengjun had to record the position and distance to avoid getting lost—God knows if there will be other organs waiting for this seemingly simple passage—so he can force himself not to listen to Jin Footsteps behind.

The sound of heavy footsteps followed Yu Chengjun's path like a shadow, as if he was about to catch up.He didn't dare to turn his head, fearing that he would be swallowed up by the strong emotion behind him.

Yu Chengjun also understood that he was just looking for a scapegoat in his heart, and put all the blame on Jin, so he could pretend to be a victim, pretending that he had no choice but to jump into the trap set by Jin... But if he didn't If you are tempted, then everything Jin does will not have any impact on him.

He didn't want to admit that he was incapable of handling the situation when he was caught in this relationship.He has assumed hundreds of times in his mind, if only Jin was a woman, if only Jin was a living person... If so, all the problems might be solved... If so, then Jin would still be the same Is that him?

To be honest, Yu Chengjun hopes that Jin can remain the same, and also hopes that the two will maintain the same inseparable relationship as before.

He wants Jin to stay by his side, but he can't make any promises... Knowing that this kind of thinking is selfish and despicable, but when Yu Chengjun encounters this kind of problem, he inevitably begins to realize it.

Yu Chengjun has always yearned for family life, but he has no intention of meeting other people until his life settles down.He always thought that one day he would return to a normal and normative society; he would not be engaged in the shady tomb robbery industry all his life, and of course he never thought of marrying a zombie as his wife...

But the picked up zombie still disrupted all his steps.

……Oh shit!When did I become so awkward?Yu Chengjun staggered

Unable to give up Jin, how can he leave behind the people and things he cares about the most and follow his original life plan?

Yu Chengjun's love is both realistic and pure. To love someone is to start a family with her. After retirement, you will live a life full of sweethearts and grandchildren. The two of you will grow old together... No matter which one, Jin can't do it. Let alone having a baby.

At the thought of having skin-to-skin contact with Jin, his heart beat like a drum beating uncontrollably, and he couldn't tell where the tension came from.

Although he once felt thirsty when he saw Jin's body while changing his dressing, he hypnotized himself, it was just a problem with his cognition.Yu Chengjun understands that Jin's feelings for him are by no means platonic, as he usually likes to play tricks...

To sum it up, he and Jin seem to be in love with each other?This thought made Yu Chengjun startled, and without paying attention, he hit his head on the low rock wall.

A solid sound made everyone stop.

Ye Li and Jin looked at him worriedly, but the old man Gui shook his head and said, "What's wrong with you recently? You got cheated out of your money, so you're so lost?"

Yu Chengjun dodged Jin's concerned eyes, and explained in a panic: "This, this is presbyopia..."

Ye Li and the old man Gui both thought: Everyone can see that he is absent-minded, who can be deceived by such a lie?

Jin Shan said understandingly, "Jun, getting old is inevitable, but you should need a pair of glasses."

Yu Chengjun didn't make a sound and turned his head silently.The only one who would believe this outrageous lie was probably pure Jin, so he felt even more ashamed.

"Huh?" Jin suddenly pricked up his ears and ran a few steps forward. "There is a sound of water flowing ahead..."

Ye Li's face turned pale in an instant, and he said in a trembling voice, "You won't do it again?!"

King made a silent gesture and listened carefully for a moment. "It should be an artesian spring or an underground river..."

The old ghost's eyes lit up, and he ran forward without caring about the others.

After walking for about 10 minutes, the vision suddenly opened up.This is a huge natural cave, and what lies ahead is a swift underground river and limestone landscape on both sides.

"We're not going back to the water hole, are we?!" the ghost old man asked with his eyes wide open.

"No." Yu Chengjun said confidently, "This is another underground river. Its altitude is lower than that of Benxi Water Cave. Judging from its direction...it seems to be heading northeast."

"I can't find this place on the map..." Ye Li held the miner's lamp, his face was almost on the map.

"Tsk, where are we going now..."

Yu Chengjun looked around, and found traces of a fire a few meters away, and a gray object about half the size of a palm was thrown beside it.He picked up the thing, walked back and said, "Look."

"What is this?"

"This is the inflation valve of the rubber boat." Yu Chengjun picked it up and looked at it carefully. "There is a crack on the side, so I threw it away. There are still traces of a fire there, and the embers have not been completely extinguished."

"At least I can be sure that Professor Luo left by boat... But, upstream or downstream?" the old ghost asked doubtfully.

Yu Chengjun murmured: "The water flow here is extremely fast. If you go upstream, you can't do it by just relying on poles. You must install a motor. But from the inflation valve, I can't tell whether Professor Luo is using it. It's an on-hook rubber boat..."

He thought about it for a long time, and thought: If Professor Luo came in by the same route, then he would have to carry a heavy and not small motor in from the mouse hole... This sounds impossible.

"Let's go downstream first." Yu Chengjun said cautiously, "I think the probability of going downstream is higher. If it doesn't work, let's go back."

Yu Chengjun took out the rubber boat folded into a small bag and the mini air pump to quickly inflate it. The four of them put on life jackets, boarded the rubber boat, and moved forward along the water.

For the convenience of carrying, Yu Chengjun bought a light and thin rubber boat. This kind of rubber boat suitable for fishing is not as tough as that used for rafting. Yu Chengjun and Old Ghost held the folding oars to control the direction, lest the rubber boat bump around and be scratched by the stones on both sides of the river.

The size of this unknown underground river is smaller than that of Benxi Water Cave, but after the rubber boat sailed out for a while, they realized that this winding waterway might be the longest limestone cave in the world.

"The direction of this river is to the northeast..." Yu Chengjun looked at the compass needle and said in amazement.

Although the river course is tortuous, Yu Chengjun points out the detailed location and distance on the map every time he passes a bend, so it can be judged that the general flow direction of the river is from southwest to northeast.

"To the northeast? Isn't this completely contrary to the terrain?" Jin frowned, "Isn't this river going out to sea?"

The old ghost stroked the remaining hair on the top of his head and said, "I haven't heard of any inland lakes in that area. It probably seeps into the ground. I'm more concerned about where the source of this river is. The southwest side is low. the river should be

Formed by groundwater. "

As you go downstream, the river gradually becomes wider and the water flow is gentle. The limestone landscape along the coast has not been damaged by human beings, but you can't enjoy it with a leisurely mood.

Jin and Ye Li, who were sitting in the bow, each carried a miner's lamp to illuminate the light. As the boat moved, the staggered stalactites and stalagmites on the shore seemed to come to life, and the shadows reflected on the cave walls seemed to be indistinct. .Neither of the timid ones wanted to show weakness in front of each other, they gritted their teeth and suppressed their fear.

Yu Chengjun stared blankly and obliviously at the front, as if he was concentrating on the road conditions...Of course he wasn't afraid of mere shadows.

For him, the man sitting in front of him is even more terrifying.

Jin turned his back to him, his slender body curled up.Since Jin has no sense of heat and cold, he still wears very thin clothes in this cold and bleak season, with the short hair tail sticking to his bare white neck, and occasionally he can see his side face turned from looking left and right...

When Yu Chengjun found that the paddling hand stopped and slowly stretched out towards Jin, he realized that his mind had already imagined what it would be like to touch that delicate-looking skin...

With a sudden jolt, Yu Chengjun turned his head and saw the old ghost's strange eyes.

"Did you quarrel with the little zombie?" The ghost old man leaned close to Yu Chengjun's ear and whispered, "Look at the way you wanted to push him down just now... How about it? Let me help you? Take this opportunity to deal with him." ..."

Yu Chengjun couldn't argue with his mouth, and he couldn't tell that it was actually...

He could only say with a guilty conscience: "You, stop talking nonsense!"

When the two talked, they lowered their voices so that even Ye Li didn't hear them, but they ignored Jin, who had excellent hearing and could hear the sound of water flowing five or six hundred meters away.

Jin was shocked when he heard the old man's words, and suddenly felt restless like a thorn on his back, but he didn't dare to turn around and ask...

Could it be that Yu Chengjun finally couldn't stand his entanglement and decided to leave him here once and for all?Jin thought regretfully, if he had known earlier, he shouldn't have gotten too complacent relying on Yu Chengjun's tolerance of him in every possible way.

The four of them, each with their own thoughts, slowly drifted along the current to the unknown end...

The voyage was unexpectedly long.Ye Li, who hadn't slept all night, sat on the bow and dozed off, while the old ghost's eyes were wide open and covered with bloodshot eyes, maybe it was because of lack of sleep or because his blood was rushing because of thinking about treasure.

Yu Chengjun memorized the azimuth and distance along the way, and calculated that the location was about tens of kilometers away from the starting point at the beginning. He carefully asked the question: "Should we go back? Or did we ignore some fork in the road?"

"I don't know!" said the ghost man irritably. It seems that he has been suffering from anxiety for a while. "I didn't see any fork in the road at all, maybe Professor Luo's little bastard made some secret passage..."

Seeing that the old man started to quarrel with the child and vented his anger for no reason, Yu Chengjun could only patiently say: "So what do you decide? Do you want to move forward or turn back?"

The old ghost said angrily: "Old man, I will not turn back until I die! I don't care about the treasures of Manqing! Now I think it is more important to go to the end of this river. Maybe we will find the longest river in the world. When the time comes to name this river after me, isn’t this even more remarkable than those vulgar treasures?!”

Boss Ye Li, who was woken up by the ghost old man, was upset, rolled his eyes and said sourly: "Your old words are contradictory."

Yu Chengjun frowned and signaled Ye Biebie's disobedience to the old man Gui. If the old man Gui found an excuse to get angry, he would only make more unreasonable demands.Yu Chengjun no longer expected to find Professor Luo on this trip, so he could only return to the

After he left, he made a long-term plan, and now he also feels that he was too impulsive back then.

Jin looked at the angry faces of everyone, and after counting the time, he realized that they had already eaten three meals. He thought that the lack of blood sugar made everyone tired and irritable, so he hurriedly took out the dry food in his backpack and shared it with everyone. :

"I also want to continue walking and see what Professor Luo wants me to know. Even if I can't get what I want this time, there will still be another chance. So, take it easy, and find a place to rest later. "

Ye Li, who likes to refute Jin the most, also nodded in agreement. He really needs to lie down and sleep for a while.The rubber boat is a four-seater, and there is no way to lean back and squint.

The limestone terrain in the back section of the river is not so obvious, and the terrain is much gentler.Yu Chengjun found a relatively flat bend to touch the shore for everyone to take a nap. He had just landed, and before he had time to light a fire, Ye Li fell asleep leaning against a rock.And the ghost old man vaguely explained that after Yu Chengjun took the first shift to watch the night, he also couldn't wait to get into his sleeping bag, and snored lightly as soon as he closed his eyes.

Yu Chengjun called Ye Li up and asked him to spread out his sleeping bag and go back to sleep. When he turned around, he found that Jin was already lying next to the ghost old man, and he seemed to be asleep.

Yu Chengjun sighed slightly, took his coat and put it on the back of Jin's neck.Jin, who is used to a life of wealth and honor, has no complaints about the poor life after rebirth, only after the last full moon, he timidly asked Yu Chengjun if he could give him a soft pillow.

...It must be the jade pillow that has slept in the coffin for 100 years, so he still has lingering fears, Yu Chengjun thought.

Since Jin was stabbed, he also needs to sleep and recuperate like ordinary people, and has become much quieter. Even Ye Li is not used to Jin being so quiet.

Anyone with a discerning eye—except the old ghost—could see that Jin's change was due to Yu Chengjun's unpredictable attitude recently.

Yu Chengjun started the fire silently, and when the fire made a slight crackling sound, he opened the can and placed it beside the fire to heat it up.The firelight reflected Jin's sleeping face, dyeing his smooth skin orange.

Yu Chengjun forced himself to look away, this kind of behavior that only dares to stare at others when they are unconscious is simply perverted!

Even so, Yu Chengjun still couldn't restrain the impulse in his heart, only at this time, he dared to let go of the feelings and longing like a spring...

Suddenly, a drop of water slid down Jin's face and disappeared into his temple hair.Yu Chengjun looked up and saw that there was a stalactite just above the gold, and water droplets were gathering at the tip, which was about to drip again.

He didn't even think about it, and reached out his hand to catch the water before it hit Jin's face.The water droplets shattered in the palm, soaking in a trace of ice cold.

Yu Chengjun maintained his movements, looked down at Jin's sleeping face, and stretched out his other hand to wipe off the water marks on Jin's face.

Even though he couldn't express his thoughts, he still sincerely hoped that Jin could live in peace and that he could sleep soundly.

Drops of water accumulated in Cheng Jun's palm. He carefully moved his hand away to prevent the water that was about to overflow from seeping out, and then stretched out his other hand to continue to catch the water.

All he can do is this trivial little thing, to prevent Jin from discovering and silently expressing his unspeakable throbbing.

Jin moved slightly, and Yu Chengjun quickly withdrew his hand, pretending to be nonchalant. Fortunately, Jin didn't wake up, but turned over and continued to sleep.Yu Chengjun stepped forward with a wry smile, and removed Jin's hands and feet from the old ghost.

The night passed, and as the four people took turns to watch the night, everyone got a full rest, and after a simple grooming, they boarded the rubber boat and continued to move forward.They stopped from time to time to observe suspicious places, but they found nothing. In the end, the old ghost half-give up and took pictures with his camera, just like a tourist.

"I'm tired." The ghost old man said suddenly.

Yu Chengjun stared straight ahead without moving, concentrating on rowing, while Ye Li curled his lips with an expression of "Here we go again".

"Let's go back if we see the exit later, I don't want to waste time with that little bastard Professor Luo."

Ye Li said sourly: "If there was an exit, I would have gone out a long time ago. The problem is that I didn't even see a mouse hole all the way down like this."

"Swipe back!" the ghost old man instructed.

Yu Chengjun stopped, turned his head and said: "Master, I estimate that this place is more than 100 kilometers away from the place where we started, and we have to go upstream for more than 100 kilometers... I can't bear it."

Personally, King would have preferred to walk back.Although the water flow was fairly steady, it still made his stomach churn faintly.

The old ghost said "tsk" and then he didn't make another sound. After being quiet for a while, he couldn't help but said, "One hundred kilometers? I don't know if it can be counted as a record."

Jin clutched his stomach and said weakly: "The longest underground river discovered so far is in Mexico, about 150 kilometers... This was introduced by the Discovery Channel before."

"Oh! It seems that this small ditch is very promising!" The old ghost rubbed his palms excitedly and said, "The place where we just got on the boat feels that there is still some distance from the source, and the tail has not been seen yet. ...I can say first, this river must be named after me!"

"Judging from the distance traveled and the speed of the flow, the current position is already very deep underground." Yu Chengjun pondered.

"Can you figure out where it is now?" asked the ghost old man.

"Almost... Huh?"

Before Yu Chengjun finished speaking, he noticed something unusual on the shore with sharp eyes, and slowly punted towards it.

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