There was indeed another world under the gray buildings. However, what surprised Qin Style was that he originally thought that these underground buildings must be the gloomy scene, and the scene where the torch was lit like a ghost domain, just like the scene when he was locked in Zhaozhu in Shangjing, but the fact is that the light below was very sufficient.

At this time, the sun was bright outside the building, but there was plenty of sunlight in the deep underground space, which surprised him. He looked up at the aisle where he was, and then he found that there were bronze mirrors embedded on the top, and those lights used some incredible means to make the light reflected inside by these bronze mirrors.

"What is this?" he asked, pointing to the top of his head.

"Your Majesty, this is Xu Lai's ability!" Shu Chang said happily: "He was born in a secret school of engineering. These were created by him using information from the authorities. I don't understand the specific principles. Although he has not been here for many days, these things are just a piece of cake for him. When we were staying in that remote village, many experiments were also done underground. He set up these institutions so that we did not see the light of day. Ha, if it weren't for these methods, how could he have tricked my junior sister into it?"

"What a talent!" Qin Feng was amazed in his heart, but he was very despised by Shu Chang's words. What does Xu Lai mean to deceive your junior sister? Look at Xu Lai's elegant and elegant junior sister, maybe it was your tall and powerful junior sister who used some means to trick Xu Lai into cheating him?" Why didn't you see him today?"

"Oh, he found something good." Shu Chang said: "When Ning Zeyuan came back last time, did he bring back red wine, glassware, and some mirrors? Xu said that the reflection effect of these mirrors is much better than that of bronze mirrors. If all the bronze mirrors here are replaced with such glass mirrors, the environment would be better. He swept away all the things in my house and was staying at home to study this thing! He had never seen these things before."

"According to the time, Ning Zeyuan should be coming back soon. It has been almost half a year. Not long ago, a merchant ship has brought back their news. The matter has been done almost. When he comes back, he may be able to bring back the craftsman who can make such glass."

"That would be better." Shu Chang said happily: "This glassy land is a good thing. After all, it is limited in quantity. Moreover, this kind of thing is not easy to transport and is very easy to damage. If you can make it yourself, that would be great."

The group walked forward along the long alleyway. The houses on both sides were basically empty, and there were some messy things piled up inside.

"Are there many people coming here this time?" Qin Feng asked. From Shu Chang's mouth, he knew that the cyclopedia in the secret door specialized in various agencies and had great methods. In Shu Chang's eyes, the current Minister of Works, the current Minister of Works, is just an apprentice-level figure in Xu Lai's eyes. If Xu Lai was a professional, then the skilled hand was a pure wild way. But Qin Feng naturally knew what skilled hand had brought to the Ming Dynasty. Now that he had a powerful craftsman with such powerful means, Qin Feng naturally wanted to use their greatest ability.

"There are not many people who have passed the genital engineering department." Shu Chang said: "Their subjects are so popular in the world. It is really easy to get a lot of money. So, there are few people who are really willing to calm down and come to the research department. They are very demanding in recruiting people, so they can leave after learning a half bottle of water. There are very few people like Xu Lai. But it doesn't matter. With him, he can stand up to hundreds of other genital engineering guys, and he has brought several disciples here."

"You know that the Ministry of Works has an Ordnance Research Institute. Where do you think it's better to let Xu Lai go to work?" Qin Feng asked.

"Since he is here, it is naturally all arranged by His Majesty." Shu Chang nodded, "There is indeed a place suitable for him."

As they spoke, the two were already standing in front of a spacious house. Just like outside, there was plenty of light here, but what was terrifying was that there were actually several skeletons, real people's skeletons. More than a dozen people in white robes were surrounding one of them, discussing something enthusiastically.

"You actually brought these bones?" Qin Feng said in surprise.

"I brought only a few representative ones." Shu Chang said helplessly: "In my hometown, there are really many such bones. Look, the old white-bearded man, although he is not a disciple of the family teacher, is the saint of orthopedics, among them, these bones and frames are all made by him. His craftsmanship is extremely impressive."

Seeing the old man holding a thin piece of iron in his hand and gesturing something on the bone, Qin Feng turned his puzzled gaze to Shu Chang again.

"He used this iron piece to connect the broken bones, so that the injured could recover faster. He died a lot of people in order to do this. Later, he realized that after the iron piece he used was inlaid, it was not long after that. The dead people were rusted because of the rust. Later, Xu Lai solved these problems for him. However, Xu Lai had too much effort to make those rust-free steel pieces, so his research has been unfast. Now that he has arrived in the Ming Dynasty, he has the right to do it. The Ming Dynasty's steelmaking skills can solve his biggest problem and can create various types of steel pieces he needs according to his needs. Look at his strength."

The dozen or so guys in the room who were discussing enthusiastically found the group standing at the door. The old white-bearded man bowed slightly to Qin Feng and his group, then turned around and talked about his own things, basically ignoring them.

"These people have strange tempers." Shu Chang said to Qin Feng awkwardly.

"A person with ability won't have a good temper." Qin Feng smiled, "It's like you."

"What's wrong with me!" Shu Chang said unconvincedly. "Let's go, Your Majesty, the junior sister's experimental place is ahead."

Today, Qin Feng came here. In addition to taking a look at the medical school, the most important thing was to verify the blood exchange experiment that Shu Wan was doing. If it was really feasible, it would be an epoch-making change for his army and even the people of the world.

An officer in black uniform came over, a captain in the Eagle's Nest.

"Your Majesty, everything is ready." said the captain.

In the spacious room, more than a dozen people in prison uniforms were blindfolded and tied to chairs. These people were today's experimental subjects. In front of them was a wooden workbench, where Shuwan was busy.

"These people are death row prisoners. Bei Yi was ordered to secretly bring them here from the Eagle Nest prison." The captain whispered.

Qin Feng nodded and walked straight in.

In front of Shu Wan, a whole set of shiny utensils was spread out. At this moment, she carefully put a shiny needle onto a thin tube. The other end of the thin tube was connected to a small translucent leather bag.

On the platform, there have been more than a dozen such things.

"These needles are hollow, and blood draw and blood exchange are all depended on him." Shu Chang explained: "Including those thin tubes, they are made by Xu Lai. There are only a dozen sets here, but it took Xu Lai a long time. If the final verification of this experiment is reliable, the most difficult thing is how to produce these things in large quantities. It is simple to make an exquisite weapon, but it is much more difficult to make such hollow steel needles. By the way, these thin tubes are all made of duck intestines. Your Majesty, don't underestimate this thing. I heard from Xu that to make a suitable one that can be used requires more than ten processes in the middle and the scrap rate is extremely high."

"As long as the experiment is successful, I can find a way to solve other things. As long as Xu Laiken teaches other people the technology to make these things."

Shu Chang nodded. With the current manpower and material resources of the Ming Dynasty, even if it uses human sea tactics, these problems can be solved.

Shu Wan and her assistants walked to the death row prisoners with these gadgets, skillfully inserted the steel needle into the arms of those people. As the prisoners twisted uneasyly, bright red blood flowed into the leather bag along the hollow steel needle.

It didn't take long for the small bag to be filled with bright red blood. Qin Feng looked at the prisoners and seemed to be nothing serious. For someone like him who came out of the battlefield, losing this little blood was nothing.

Each bag was numbered, and then the blood in the bag was exported little by little and put it in a small white dish with the same number. Shuwan took out a bottle, used an ear-splash object to scoop out a trace of medicine powder from the inside, and poured it into the blood.

Qin Fengshu walked over and stared at the blood in the small plate.

After a moment, some subtle changes occurred in the blood. Shuwan nodded with satisfaction, and an apprentice on one side marked the word C on a blood bag.

Repeating the same process, soon, more than a dozen blood bags were marked A, B, C and D.

Shu Wan then breathed a sigh of relief and turned to look at Qin Feng: "Your Majesty, next I will inject blood with the same reaction into the human body interchangeably, and Ding's can be injected into anyone else's body at will."

"Let's start!" Qin Feng nodded.

The leather bags just now were hung high above the prisoners' heads, and the steel needles were once again inserted into the veins on their arms, and blood flowed silently along the leather tube and steel needles into the bodies of those people.

"Your Majesty, the rest of the time is waiting." Shu Chang said. "As long as they can still jump around, it proves that this matter can be completely successful."

“How long can I see the problem?”

"At most one day, the damn person will die." Shu Wan said. "As long as you don't die, it means you succeed."

Qin Feng turned his head and looked at the captain of the Eagle Nest, "Take all these people back to the Eagle Nest and be detained alone, eat and drink well, and have to rest well. Every day, they must report their physical condition directly to Commander Guo. This matter is top secret."
Chapter completed!