Xuanyi pushed the wooden door open and walked in sideways, and the dark environment did not affect Xuanyi's vision. The space inside is huge, mainly divided into three areas, and on the left side are neatly stacked with various materials such as grain, vegetables, fruits, coal, wine jars, etc. In the middle is a separate area, enclosed by an unknown brown metal. On the far right is a prison cell, from which the strange noise heard came from.

Hearing the footsteps of Xuanyi, the people imprisoned inside struggled even more violently, but because their mouths were gagged, they could only keep hitting the metal door and wall through their bodies, making a "bang!" sound.

Xuanyi stepped forward, and a smell of blood mixed with the stench of decay came to his nose. The lower part of the cell is low, and the entire lower half of the cell is soaked in sewage, which is a very harsh breeding environment for mosquitoes and flies.

The cell was divided into hundreds of compartments, and in almost every compartment there were people being held, some of them were held in front of the iron bars of the cells and looking in the direction of their clothes, some of them had been soaked in water for a long time and had been dead, and some of them were sitting on the ground with their faces dejected.

Xuanyi's gaze swept over each cell to look for the three of them who might be imprisoned, and he found that it was not only humans imprisoned, but even some beasts and orc-like subhuman races. Considering that opening the cage and releasing the detainees might pose a threat to the personal safety of nearby residents, Xuanyi put away his mind and continued to search.

Finally, Xuanyi found Zhen Xi and Zhen Yin who were being held in a prison cell, and the two of them were huddled together and squatted in a corner of the cell. Xuanyi hurried over and whispered the names of the two.

Zhen Xi raised his eyes full of life, and the next second his heart was immediately occupied by ecstasy, he pulled up the sluggish Zhen Yin and stood up, and let out a rapid "woo!" sound from his mouth. Xuan Yi found out that the lips of the two were sewn up with needles and threads, and the slightest sound made a mouth full of blood.

Xuanyi was furious, and he pressed the mechanism on the side of the cell, and the heavy fence slowly rose. Zhenxi Zhenyin threw herself into Xuanyi's arms and cried bitterly, Xuanyi couldn't help patting the skinny backs of the two and comforting them softly, fortunately, the two of them had not suffered damage to their limbs except for some skin trauma, and they could still walk freely.

"Okay, where is Zhende? Where is he?" Xuanyi hurriedly asked about Zhende's whereabouts, Zhenxi's lips were stitched up, Xuanyi didn't dare to remove the stitches rashly, so he had to wait for the two of them to get out of trouble and then seek medical treatment.

Hearing Xuanyi's question, Zhen Xi pointed to the independent area in the middle, his eyes full of fear and panic. Xuan Yi calmed the two and walked briskly towards the middle area.

The separate area in the middle covers an area of seventy or eighty square meters, and the whole body is poured out of unknown brown metal, and there is hardly a crack in the seams. Xuanyi turned on the yin-yang identification technique and walked around this "house" several times but could not find the doors and windows that could be entered, and after accidentally hitting and breaking it again, he finally found a clue at the top of the "house", and Xuanyi jumped up to the top of the "house" where it was marked in red.

After a few tentative taps, it was evident that the metal was thinner, and there were almost imperceptible friction marks around it.

Xuanyi pressed his hand to that place, who expected that as soon as he made contact, the metal became soft and sunk his palm into it, Xuanyi withdrew his hand and stepped on it with his feet, and the whole person slowly sank inside, and then disappeared at the top of the "room".

Inside the "room", Xuanyi fell from the roof and stood firmly to take a look at the internal environment, and in the middle was a huge square table, which was full of all kinds of bottles and cans, test tubes and potions, and there were also many trays containing bloody objects, a bit like human organs or the limbs of some kind of animal. A humanoid metal cage was placed on one side of the corner, and several tubes were inserted into the metal cage to draw blood into a large cylindrical container on the table. The container was more than two meters tall and filled with a yellow-brown liquid.

This is a very simple laboratory, and the owner of the laboratory is naturally the ruler of the room, Earl Bruch.

Xuanyi carefully observed the working pattern of the circular container, and found that it used some force to draw blood and collect it and then return it to the metal cage through the tube on the other side of the container, and so on. Xuanyi determined that the metal cage must have imprisoned a living person or living creature in order to supply blood so endlessly, this rudimentary device was somewhat similar to the hemodialysis equipment of the previous life, but it was not known if Bruch designed this device for the same purpose.

Xuanyi stepped forward and padded his feet to uncover the mask of the metal cage, and suddenly a familiar face appeared in front of him, it was his junior brother Zhende, who had been missing for many days! Xuanyi completely opened the front of the metal cage and found that Zhende's naked body was filled with no less than dozens of various tubes. Zhende's blood is constantly pumped out and merged into a circular container, and then converted into blacker blood by a certain substance in the container and returned to Zhende's body, and with each reciprocating cycle, Zhende's blood color is darker.

Xuanyi hurriedly patted Zhende's cheek to wake him up, after a long toss, Zhende finally slowly opened his eyes, he saw Xuanyi's eyes flashed a little confused for a moment, and after a while, he remembered who the person in front of him was, he coughed lightly, and smiled weakly: "Senior brother, you came to save me!"

Xuan Yi forcibly held back his anger and said with concern: "Don't move, I'll get you out as soon as I turn off this damn instrument!"

Zhende closed his eyes tiredly and didn't answer, and nodded obediently.

Considering that there is no hemostatic tool here, Xuanyi did not dare to pull out the tube rashly, only blocked the end of all the tubes, and carefully carried Zhende behind him.

Xuanyi handed over Zhende to Zhenxi's care, and returned to Bruch's laboratory again, where nothing else of value was found, only a notebook was found, which recorded the data collected by Bruch after each experiment and the corresponding parameters of the instrument, Xuanyi hurriedly glanced at it and put it in his arms.

After meeting again, Xuanyi carried Zhende on his back, and behind him, Zhensi and Zhenyin supported each other and the four of them walked towards the exit wooden door, seeing that Zhenxi and the three of them successfully got out of trouble, the entire underground prison was agitated, and countless "prisoners" who were still active were frantically beating the iron fence, they were desperate for freedom.

Xuanyi was ruthless, the most important thing at the moment was to lead the three juniors out of trouble, and Zhende urgently needed to be healed, so he could only stay here again in the future.

Behind them, the wooden door slammed shut, keeping out the noise and rancid smell behind them, and the four of them walked up the long staircase until they finally returned to the surface.