In fact, Tang Yan is not clueless, at least the copper pipe, the copper pipe buried in the soil, is a very important clue.

But he didn't know why, Tang Yan always felt that the direction of the copper pipe was not the real way out, so he wanted to find out why the passage they came to was excavated.

A tunnel fifty meters long, almost one person high, this is by no means a project that one or two people can complete, if it is completed by many people, then why has this secret room not been destroyed? With the ability to open such a tunnel, it is not difficult to open this stone gate, but why does the stone gate still stand here?

Or, Tang Yan was wrong from the beginning, this tunnel was not dug from the inside out, but dug in from the outside?

It's ridiculous, who would go to the edge of this cliff and dig such a tunnel? Excavation work aside, unless it is known for sure that there is a cave hidden in a bucket room, who would come and dig such a tunnel? Even if you want to dig, you don't choose a cliff as a starting point. Any location in the mountains can be used as a starting point for the tunnel.

Tang Yan let go of Wei Ruoyi in his arms, stood up, and picked up the sapper shovel and the oil lamp: "You stay here for a while, I'll go back and take a look." ”

Wei Ruoyi didn't know what Tang Yan wanted to do, but at the moment, she was cold and hungry and didn't have much energy to follow Tang Yan, so she had to nod pitifully, hugged herself tightly, and curled up in the corner of the room.

Tang Yan strode around the two bends, brandished his sapper shovel, and began to dig both sides of the earth wall at the exit of the bend. There was no need to dig deeper, and Tang Yan judged from the strength of the soil that there was no possible exit on either side of the soil wall. The re-blocked passage is absolutely different from the original dead end, the degree of condensation of the soil, and now he is also a gravedigger, if he can't even make this simple judgment, then the skills given by the system are scum.

The reason why he suddenly came to make such an attempt was because Tang Yan was very suspicious that beyond those two curves, there was another passage, and that passage was sealed by someone. If that's the case, then Wei Ruoyi's question is easy to answer, it is precisely because the normal passage is outside the two corners that there is a need to worry about the leakage of lights.

But in this case, another question arises, why do you need to worry about light leakage in such a deep tunnel? It's impossible to say that this passage is a busy road, so there are often people who walk in when they have nothing to do, right? Unless, the bend wasn't meant to block the light at all...... Not to block out the lights?

A thought suddenly flashed through Tang Yan's mind--is it to block the flowing water?? Or was it a tunnel dug to drain the water? In this way, it is reasonable, and the stone gate is not a stone gate, but a jack gate, which is also to block the flowing water. And in this way, it can be explained that it is wet all the way. As a result, Tang Yan's initial judgment was completely overturned, and this was not a general's mausoleum at all, but a passage made to guide the groundwater.

If this is the case, all that is behind the stone gate is water, and this place has become a dead end? And even if all previous judgments are overturned, this new speculation still has many loopholes and cannot be justified at all.

Tang Yan was really distressed, he didn't seem to be able to find a reasonable inference at all, this tunnel originally thought it was an escape channel, but now it seemed to have become an unsolvable problem, making Tang Yan, a master of problem solving, at a loss.

put the oil lamp back and instructed Wei Ruoyi to continue waiting in the room, while Tang Yan took a flashlight and went back the way he came to continue his search. Now, it seems that only the authenticity when he came can give Tang Yan a possible answer.

Returning along the way he came, Tang Yan found that the road under his feet seemed to have a very slight angle, not parallel to the water level.

Tang Yan didn't notice it when he came in, but at that time he just thought that this tilt was caused by the impossibility of being so precise in the excavation work, but now it seems that there is something very problematic.

The section of the road that Tang Yan has already walked, the slope of the road surface is high in the front and low in the back, which means that the position of the bucket room is the lowest, and now it is a higher place. While walking, Tang Yan suddenly found that this tunnel began to become low in the front and high in the back again, which means that Tang Yan has walked through the highest point, both ends of this tunnel are low, and only a certain part in the middle is high.

After discovering this anomaly, Tang Yan quickly returned to the position where the terrain had obviously changed in height, that is, the highest point.

Standing at the highest point, Tang Yan simply calculated the distance between the two sides, and it should only be more than ten meters away from the bucket room, which is not too long.

The water was brought in from here, leading to both sides of the passage, and the purpose was actually to bring the water to the place behind the stone gate. When the place was filled, the water was blocked by a stone gate, and the place was sealed, but the passage was left. The room outside the stone gate was repaired and formed after the completion of the water diversion, and its role was to guard the mausoleum for the general. This is still a mausoleum, but the general is more careful than Tang Yan imagined, he not only repaired his tomb in the mountain, but also felt that it was not safe, and even filled his mausoleum with water to prevent future generations from robbing the tomb.

"This guy must have offended a lot of people!" Tang Yan said with emotion that by now, he had basically figured it out, and the situation here was far more complicated than he imagined.

The mausoleum, after it was built, was sealed, and then water was diverted from here to pour in, and finally the stone gate was used, which was actually a jack gate, to block the water in the tomb and here, and finally built a bucket room and sent people to help him guard the mausoleum.

The entrance where Tang Yan and Wei Ruoyi came in was not excavated by later generations, but originally existed, and it was the place where the descendants of the general came in to worship him. To put it bluntly, in fact, it is an ancient general, in order to prevent future generations from robbing the tomb, or other reasons such as feng shui, and built his mausoleum underground, and left a passage for his descendants to enter and worship.

Not long ago, this place was discovered, and it was definitely a tomb robber, and it was almost impossible for people like Tang Yan and Wei Ruoyi to break into this place by accident.

It's just that this tomb robber must have also discovered the mystery of this tomb, and he knew that this was not something he could take out of the treasure in the tomb by himself, so he retreated.

Judging from the tools left by this man or the treasure that must exist in this mausoleum, it is impossible for this tomb robber to give up this mausoleum, and he withdrew only to find a solution, and then come and take the treasure from the mausoleum.

After thinking about all this, Tang Yan decided to go back to the room, and now it was time to deal with the copper pipe behind the oil lamp. For a long time, Tang Yan's biggest concern was that this was a Jedi at all, and now it seems that everything points to this. If there is one last bit of life, then it can only be after that copper pipe. No matter how much trouble that copper pipe would bring to Tang Yan, he could only gamble at this time.

Walking quickly towards the room, Wei Ruoyi had obviously reached the limit of what his body could bear, under the light of the oil lamp, Wei Ruoyi's lips were already purple, and his teeth were still bumping up and down, but his body didn't seem to tremble.

Tang Yan hurriedly pulled Wei Ruoyi up, hugged him in his arms, and warmed Wei Ruoyi's body with his body temperature.

"You...... You're back...... Here it comes? "Wei Ruoyi has really reached the limit, and he can't even speak completely.

"It's back, we'll be able to get out soon, you have to hold on!" In any case, Tang Yan can only use such words to give Wei Ruoyi the last comfort, only if she still has the confidence to live in her heart, it is possible to persevere, if even she no longer believes that she can escape, it will only make her even more unable to persevere.

"Hmm......" Wei Ruoyi didn't believe it too much, but Tang Yan's words undoubtedly gave her a booster.

Feeling that Wei Ruoyi's body had warmed up a little, Tang Yan said to her, "Can you move now?" Try to move, I can't hold you all the time, I'm going to find a way out. ”

Wei Ruoyi nodded, agreed, gritted her teeth and began to work hard to command her limbs, she had probably never encountered such a situation, and her brain almost lost the ability to command her limbs.

Fortunately, she finally moved, and Tang Yan saw that Wei Ruoyi could already move, so she let go of her. Then, he firmly grasped the copper pipe buried in the earth wall in his hand, and then dragged it out desperately. On the soil wall, pieces of dirt peeled off, and as the soil peeled off, Tang Yan finally understood why the tomb robber left these two permanent lamps and lit them.

Although the air in this tunnel is much more turbid than the outside, it can at least meet the requirements of human survival, and a mausoleum from the Tang Dynasty, not to mention that the entrance of the cave must be sealed, even if it is always open, the air here will never reach such a level. Tang Yan initially thought that this was a living road, so the air could be kept like this, but now that he knows that this is a Jedi, that judgment is of course wrong, and this ever-bright lamp not only plays the role of lighting, but also plays the role of bringing in fresh air.

However, the introduction of air and the inflow of lamp oil went hand in hand, and the wisdom of the ancients was sometimes really a miracle, and the ancients could accomplish things that even modern science could not explain and do.

So, the grave robber lit the oil lamp......

(To be continued)