After the two returned to the entrance, Mo Ling did not stop, buried his head in another cave, and the unknown Qingzhou followed, and after a while, he retreated back - it was still a dead end.

Repeated like this several times, the time was short or long, and the efforts were in vain, Qingzhou couldn't help it, and said, "Brother Moling, are you going to try it one by one?"

"Don't try," Mo Ling returned to the entrance, also seemed a little frustrated, "These caves are too many to count, I have to try them one by one, I don't know if I will try it in the Year of the Monkey, we have to find another way." ”

"That's what I told you. Qingzhou sighed, "I thought you had a way." ”

"......" Mo Ling didn't respond, but sat down against the wall, and asked calmly, "Brother Qingzhou, we have drilled a lot of caves before and after, in your opinion, these caves can follow the rules?"

"What rules can there be, some are deep and some are shallow, some are big and some are small, except that they are all black, I can't find any rules. Qingzhou sat next to Mo Ling, "Brother Mo Ling, don't sell it, just say what you think." ”

"Shades of depth and size, isn't this just the rule," Mo Ling said with his chin propped up, "Imagine that one of these caves leads to the Mo family's lair, and Mo Si'an is there—what does Brother Qingzhou think this cave should look like?"

"This ...... I can't think of it. Big?"

"Yes, it's just one word, big. ”

"What's the use of knowing that it's big, these holes are similar in size, and I can't tell who is big and who is small in the depths?" Qingzhou felt inexplicable.

"Of course you can't see it by looking at the hole, but we can speculate on who might be bigger. ”

"How can this be speculated?" The more Qingzhou listened, the more mysterious he felt, and he couldn't help muttering in his heart: Since you said it was speculation, then you shouldn't go in and see it again, right?

"Regarding the law of these caves, Brother Qingzhou just missed a point, these caves have no forks in the way, and there are even few twists and turns, and they are arranged very closely with each other, in this case, if you want to build a very large cave, you must first dig deep. ”

"Wonderful-" Qing Zhou clapped his hands, "Those shallow caves will not be the Mo family's lair, these can be eliminated first." ”

That's what it means. We can't guess the size of the cave, so it's better to guess the depth of the cave. ”

"But how can you guess the depth of the cave?"

"Droplets of water dripping from the top of the wall. "The deeper you go into the cave, the more water there is on the ground, and this water seeps in from the outside, and has nothing to do with the structure of the cave. In other words, as long as the cave is deep enough to a certain extent, there will always be standing water on the ground. ”

"There is some truth to it...... But there are so many caves with stagnant water, how do you tell who is deep and who is shallow?"

"That was for later, the first thing we had to do was get rid of the caves that weren't waterlogged. Because a cave with standing water doesn't necessarily happen to be what we're looking for, but a cave without standing water is definitely not what we're looking for. ”

"Wonderful, wonderful. Qingzhou couldn't help but clap his hands and praise, "Then how can Brother Demon Ling tell which caves have stagnant water and which ones don't?"

"There is a way, but I need Brother Qingzhou's help. "It's easy to say, it's easy to say, Brother Moling, please speak. ”

"In the water-based secret method, there is a relatively basic set of spells, called Ice Condensation Technique, Brother Qingzhou should know it, right?"

"I don't know much about spells, but I still know the Ice Freezing Technique, which is one of the introductory spells of the water-based secret method. Qingzhou nodded and said.

"The reason why the Ice Condensation Technique has become an introductory spell for water-based secret methods is not only because it is simple to cast spells and consumes less spiritual power, but more importantly, it has a long casting distance. If you are proficient, you can turn the water mist dozens of feet away into ice crystals, which is quite practical. ”

"......" "What's wrong, is there something wrong with what I said?" Mo Ling asked when he saw that Qingzhou didn't speak.

"It's not wrong, but it's too right," Qingzhou looked at Mo Ling's eyes a little weirdly, "It's exactly the same as what is written in the book." ”

“...... Putting that aside, since Brother Qingzhou knows the magic of the Ice Condensing Technique, he should also know what we should do next, right?"

"You're going to cast an ice spell at the entrance of the cave to detect whether there is standing water in the depths of the cave. "Yes, Brother Qingzhou can help me. "Of course. ”

After the discussion, the two went their separate ways, each casting a spell to find their way. I saw that Mo Ling came to a cave, twisted his fingers and chanted, and as the word "broken" spit out from his mouth, a crisp sound of ice crystals exploding came from the depths of the cave. Mo Ling was not very satisfied with this result, so he worked on his feet and drew a big cross at the entrance of the cave.

Qingzhou's movements here are not slow, following the appearance of the magic feather to draw a scoop according to the gourd, and in about half an hour, he searched more than 100 caves of all sizes on the stone wall, and made corresponding marks.

When the two of them finished work at the same time and met at the entrance sweating profusely, all the caves had been separated by two signs, and Qingzhou asked expectantly, "Brother Moling, what are you going to do next?"

"There are waterlogged caves on my side, about half of them, what is the situation on Brother Qingzhou's side?" ”

"Half of them...... "Demon Ling's forehead was covered with clouds, "In other words, there are still more than a hundred caves that can't distinguish the real from the fake, and this is really tricky." ”

"What do you mean by Brother Demon Ling," Qingzhou was slightly stunned, "It shouldn't be the end of it, we finally eliminated half of the caves, you have to think of something anyway!"

"Don't worry, I'm thinking. Mo Ling said with a frown.

"Okay, okay, I'm not in a hurry, you hurry up, hurry up. Qingzhou said this on his mouth, but his body paced back and forth uncontrollably, shaking so impatient that Mo Ling couldn't help but say: "If you can't stop, it's better to go to the cave and try your luck." ”

Qingzhou heard the resentment in Mo Ling's words, and in desperation, he sighed, walked to the side and sat down alone, tapping his fingers while staring at Mo Ling anxiously and expectantly.

Mo Ling simply sat down, looking at the dense caves on the stone wall in a daze.

Time passed quietly between the two, taking away the sweat from the soaked vest little by little, and when Qingzhou woke up from a shiver, he suddenly found that the silence had unconsciously completely wrapped the two of them inside. Qingzhou opened his mouth, but his throat was so dry that he couldn't make a sound.

At this moment, Mo Ling suddenly stood up and slapped a fist in the palm of his hand: "There is a way." ”

Qingzhou was stunned for a moment, then rushed to Mo Ling's side, and asked happily, "What way!"

"Don't worry, it's just my speculation, it's not necessarily accurate......" Before Mo Ling finished speaking, he was interrupted by Qingzhou: "Your speculation is very reasonable, it must be accurate!

Qingzhou's words made Mo Ling a little unbearable, "...... Anyway, you calm down a little bit...... Although we have eliminated half of the caves by speculating on the depth of the caves, this is not enough, because we have missed an important clue, which occurred to me when I was staring at the cave on the wall. ”

"What a clue you said!" "The distance between the caves. ”

"The distance between the caves?" Qingzhou didn't understand.

"Yes, if our previous speculation is correct—that the interior of the cave is not bifurcated, and that there are few twists and turns, then the more spacious a cave is, the fewer caves it will have nearby. In other words, two deep caves that are too close together are unlikely to be made very spacious. ”

"I see!" Qing Zhou suddenly realized, "The spacious caves should be built deep in one place, and there should be no other caves around them. In other words, next to the cave where the Mo family's lair is located, there should be relatively shallow caves, just follow this clue to find it!"

“...... Presumably, "Demon Ling doesn't seem to have full confidence," but how far apart the two caves are not considered 'close' is also a question. Mo Ling swept the entire surrounding stone wall, and muttered, "There are almost more than ten zhang in length and width, if the distance between the phases is counted as three zhang, you can almost pick out more than ten caves, why don't you start with these caves first......"

"What are you muttering," Qingzhou asked, "tell me how to find it, and how far apart should be between the two deep caves?"

"Sanzhang," Mo Ling held out three fingers, "let's go find it at this distance first-"

Before Mo Ling finished speaking, he saw Qingzhou jump up, fly up the stone wall, and find the nearest deep cave, "As long as there is no other deep hole within three zhang around it, even if it is passed, right?"

"Not bad. With that, Mo Ling went to the other side and looked for it.