At a rail transit construction site in the Tang Dynasty, on one side are the assembled and laid tracks and the integrated track base assembled in sections. On the top are parallel double track tracks, and the reinforced protective cover is covered on the track like a glass tunnel. Although these are quite backward things in the world of science and technology, they also seem to have a full sense of science and technology in this world. Of course, people in this world will not have the concept of "sense of science and technology", but will simply feel novel.


    In front of the paved track, in addition to a small section of the road where the foundation is being laid, there are magnificent mountains ahead, which really "look across the ridge and form a peak". According to the construction plan, the track needs to go straight through the mountains, so the next thing to face will be a large number of tunnel works.


    Cheng Liangqi and others stood in front of the mountain and offered their flying swords. According to the range delineated by Ye Xiao, they have begun to dig the mountain. With the flashing of sword lights, large pieces of rocks were cut down, a huge cave was gradually formed on the mountain, and a large number of gravel piled up on the ground into a hill. Then, a Yuanying ancestor wiped the heaven and earth ring on his hand, a light fell on the gravel, and the accumulated gravel was cleaned up in an instant.


    While digging the hole, he cleaned up the gravel. With the tacit understanding formed in these days, Cheng Liangqi and others are not slow in digging the tunnel. However, they had just pushed a distance of tens of meters. Suddenly, a light burst out in the tunnel, accompanied by a cry of broken sword. A flying sword was overwhelmed and scrapped.


    For this situation, although Cheng Liangqi and others have a slight pity in their eyes, they have not stopped their work. A flying sword was scrapped. Although it is not very common for Cheng Liangqi and others, it is not very strange.


    On the one hand, the flying sword is not a magic weapon, it is only a magic weapon level, and the quality is naturally relatively general. On the other hand, flying sword is really not suitable for this kind of work. Even if it is replaced with magic weapon flying sword, I''m afraid it will not be much better than the broken flying sword. Even ordinary people know that sword is not suitable for chopping and hard confrontation.


    Just then, a sword light flew in the distance and fell on the construction site. It was Ye Xiao who returned from yuqingzong.


    "Brother ye, I don''t know elder ye asked you to go back, but do you have anything to tell me to do?" Cheng Liangqi and others were at the mouth of the cave. Seeing that ye Xiao who had left in a hurry came back, they immediately came forward and asked with great curiosity. Although Ye Xiao, like them, is an elder of Yuqing sect, Cheng Liangqi and others have always been called "brother Ye" or "Taoist friends" in order to distinguish them from ye Zan.


    "Don''t worry, elder ye called to the next Huizong for the construction of rail transit." Ye Xiao said with a smile.


    From ye Xiao''s expression, Cheng Liangqi and others can guess that ye Zan suddenly summoned Ye Xiao back to yuqingzong this time. It seems that he is not dissatisfied with the construction progress of himself and others. However, it was precisely because of this that they were secretly relieved. At the same time, they were more curious about ye Xiao''s words.


    "Is it for the construction of rail transit?" Cheng Liangqi said, and then asked with some speculation: "is there any change in the construction plan?"


    After this period of construction, Cheng Liangqi and others know one thing, that is, although Ye Zan doesn''t come in person, they are very clear about all aspects of the project. Therefore, in their opinion, since Ye Zan is probably not dissatisfied with the construction progress, it is likely that he knows that he and others have difficulties in construction, so what changes have been made to the construction plan.


    Ye Xiao smiled, shook his head and said, "don''t guess, elders. Elder ye will summon Huizong this time because he has newly refined several magic tools specially used for construction for this project, so let me go back and bring those magic tools."


    "Magic tools for professional construction?" Cheng Liangqi and others were stunned when they heard this. With their common sense, they really can''t think of any magic tools that are specially used to do these stupid things. Really speaking, their Panlong gold seal is able to touch the professional in terms of tamping the foundation, but it is only because the power happens to touch the edge. In fact, Panlong gold seal used to tamp the foundation is not as good as expected.


    "Yes, it''s a professional magic tool for construction." Ye Xiao didn''t catch everyone''s appetite. When he said this, he lifted his hand and emitted a light on the ground in front. As the light dissipated, pieces of "magic tools" with huge volume and strange appearance appeared in front of Cheng Liangqi and others.


    Magic weapons can be changed. They can be as big as mountains and as small as mustard. For example, Cheng Liangqi''s Panlong gold seal. Although the golden seal of the dragon is the lowest level magic weapon, it can also be turned into a mountain when it is sacrificed. However, magic tools can''t work. Although some have magical powers, their forms will not change. Even if they change in size, the range of change will be very limited.


    Therefore, these large "magic tools" refined by Ye Zan also maintain their original shape and size. These "magic tools" include shield machines specially used for tunnel excavation and the largest machines, as well as dynamic rammers for tamping the foundation and machines specially used for earth excavation. Of course, due to some characteristics of magic tools, these machines are very different from the prototype machines in the world of science and technology. At least these machines do not need a cab. For example, an excavator is like a simple large bucket.


    Among these machines, ye Zan has also made a lot of modifications to the shield machine used to dig tunnels. For example, on the most important drill bit, ye Zan used the chain obtained from the childhood world as the main material. Ye Zan still doesn''t know what the material of the chain is, but speculates that a certain amount of legendary immortal gold may be mixed in it.


    Fairy gold is a legendary metal. It is said that even in the ancient Xianting era, only those great Luo Jinxian were qualified to use fairy gold to refine magic weapons. Moreover, even the great Luo Jinxian can only mix less immortal gold into his magic weapon to improve the power of the magic weapon.


    Of course, these are just legends. After all, no one has really seen Xianjin since the battle of immortals and demons in ancient times. It''s more like a farmer imagining that the emperor uses a gold hoe. Maybe it''s just an imaginary joke.


    But no matter what, the drill bit of the shield machine, using the material of the chain, has indeed reached a considerable height in terms of firmness. Even in the world of science and technology, ye Zan''s technology at the time of crossing and the so-called strongest alloy developed are still a little behind it.


    In addition to the strong drill bit, ye Zan also uses the technology of heaven and earth ring in the shield machine to store the gravel and earthwork generated during tunnel excavation. In short, ye Zan created several space boxes in the shield machine according to the technology of heaven and earth ring. These space boxes have a large storage space, which is enough for the shield machine to work continuously for a long time. Moreover, during the working process of the shield machine, as long as the operator clears the space box from time to time, the shield machine can work almost all the time until the operator does not have enough mana to drive it.


    "These, these are the magic tools refined by elder ye?" seeing those big guys, Cheng Liangqi and others can''t connect them with the magic tools in common sense. In fact, not to mention those people who came from their childhood, even in this Shenhua domain, no one has ever refined such a huge magic weapon as the shield machine. Even if it is the legendary thirty-three heavy days, the combination of those thirty-three magic tools can''t compare with this large shield machine in size.


    "Yes, these magic tools are made by elder ye and are specially used for engineering." Ye Xiao nodded and took out several pamphlets and handed them to Cheng Liangqi and others.


    Cheng Liangqi and others took the pamphlet with doubts on their faces. When they opened the pamphlet, they knew that it was the operation guide of those "magic tools". Does the magic instrument still need an operation guide? You know, for these Yuanying ancestors, even if they have never seen a magic instrument, they can be familiar with it soon. But now, ye Zan has specially prepared operation instructions for these magic tools refined by Ye Zan. Is this a little despised?


    However, after reading the contents of the booklet, Cheng Liangqi and others were only surprised. Although the operation of those strange magic tools is not so cumbersome, there are many standards to pay attention to in the construction process. In addition, in terms of operation, it is indeed different from ordinary magic tools. It can''t be played by pinching a magic formula.


    Seeing that Cheng Liangqi and others had read the booklet, ye Xiao said to them, "next, I''ll operate these magic tools first. You can compare them with the contents in the booklet."


    "Brother ye, please." Cheng Liangqi and others hurriedly said.


    Then, ye Xiao came to a shield machine and said to Cheng Liangqi and others, "just now, you are digging a tunnel. This magic tool is specially used to dig a tunnel. I''ll use it to demonstrate to you first."


    As he spoke, ye Xiao raised his hand and pinched the formula. The shield machine shook slightly and started silently with the formula. Then, under the control of Ye Xiao, the shield machine turned to the cave just dug by Cheng Liangqi and others, and drove slowly towards the inside. Ye Xiao pinched the formula and followed the shield machine into the cave.


    Cheng Liangqi and others immediately followed.


    Although the cave is only tens of meters deep, the light inside is very dark. I''m afraid I can''t see anything if I were a mortal. When the shield machine came to the end of the cave, with a magic formula of Ye Xiao, the whole body lit up a faint light. Although the light is not strong, it also illuminates the scenes in the cave quite clearly.


    Finally, the drill bit at the front end of the shield machine hit the rock wall at the end of the cave, and ye Xiao immediately changed a formula in his hand. With yezan''s changing method, the drill bit of the shield machine began to rotate, making a roar of drilling rocks, which made the gravel and fine sand in the cave rustle and fall continuously.


    However, the eyes of Cheng Liangqi and others have been locked on the drill bit of the shield machine, which is not affected by the surrounding environment. In their eyes, the rocks at the end of the cave were wiped away by the drill bit, as if they were grinding a piece of tofu. With the advance of the shield machine, the length of the cave is also extending, which looks like the rock wall at the end is retreating automatically.


    Unconsciously, a ray of light lit up in the crack at the end of the cave. Cheng Liangqi and others were surprised to realize that the tunnel was going to be opened! Moreover, before Cheng Liangqi and others had any reaction, the light shot into the cave changed from a beam to a piece, and then with a crash, the tunnel was completely connected.


    "This, this magic weapon is indeed worthy of being refined for such projects. Elder Ye''s wonderful ideas really make us sigh like Buddha!" with the completion of the tunnel, the shield machine also stopped working. Cheng Liangqi and others had the opportunity to express their feelings.


    In fact, if the world, from a very early time, practitioners applied their knowledge of Taoism to the people''s livelihood of secular mortals, I''m afraid magic tools such as shield machines would not be much rare at all. After all, everyone is human. As long as someone thinks about this, they will have similar or even better ideas.


    Unfortunately, the practitioners in this world have both disdain and fear for the secular world. Therefore, there have been no practitioners for thousands of years who want to apply their skills to the secular mortals. As a result, the productivity of secular mortals in this world has always been so backward, and their lives have never changed.


    After lamenting the efficiency and power of the shield machine, Cheng Liangqi and others turned around and looked at the newly opened tunnel. They couldn''t help feeling ashamed of their previous construction quality.


    The tunnel is straight without any deviation. Although the tunnel wall is not smooth, it is quite flat. The cave wall, as if polished by hand, has no trace of cutting, which is in sharp contrast to the tens of meters previously constructed by Cheng Liangqi and others.


    At this time, ye Xiao''s magic formula changed and a metal box flew out of the shield machine. Holding the metal box, he said to Cheng Liangqi and others: "the gravel and earth produced by this magic tool when digging the tunnel are collected into this box. There are three such boxes in this magic tool. If they are cleaned in turn, they can operate continuously for a moment until the tunnel is opened."


    "I see!" Cheng Liangqi and others heard Ye Xiao''s explanation and thought of the contents in the booklet. Before them, they used flying swords to dig tunnels and heaven and earth rings to carry gravel. Although it was not much trouble, this shield machine was obviously much more convenient in this regard.


    Then, ye Xiao didn''t care about the shield machine, but returned with Cheng Liangqi and others. He came to other machines and demonstrated them to Cheng Liangqi and others one by one.


    After reading all the demonstrations, Cheng Liangqi and others had no doubt about these magic tools, and said excitedly: "great, with these magic tools, the rail transit project will be completed faster and better!"