When the three of them arrived at the mouth of the tunnel, Cheng Dong was already a little impatient to wait, and complained a little: "I've waited for you a little longer, and now I have to speed up my actions." ”

Li Yiheng didn't care, there were no guards here, no one found out, and those prisoners were all arrested by them, so they definitely wouldn't tell the truth, so there was no need to be in such a hurry.

Diana and Rainbow went into the tunnel one after another, Li Yiheng was at the rear, and looked around again, remembering the layout in the electric prison, which would definitely be useful in the future.

The five people turned the corner and came to the iron gate, and Li Yiheng closed the iron gate according to Cheng Dong's instructions.

"You dug such a big tunnel here, and they didn't find out?" Li Yiheng asked Cheng Dong curiously.

With Xiao Ran by his side, Cheng Dong's fear of claustrophobia has also been reduced a lot, and his speech is not as nervous and cramped as before: "I have planned for so long, just to save my son from it, and I have taken into account all possible dangers." ”

Diana and Tianhong heard for the first time that the little boy in front of them was Cheng Dong's son, and they were puzzled, and Diana asked, "Since he is your son, how can he be locked up in an electric prison?"

"That is, since you are locked up in the electric prison by your domain king, and you still do things for them, do they threaten you with your son's life?" Tianhong couldn't help but question Cheng Dong.

At this time, they had come out of the tiger-shaped skull mouth passage and came to the front of the thunder loading truck, Cheng Dong jumped on the front body of the loading truck to support the handle, Xiao Ran sat behind Cheng Dong, holding Cheng Dong's waist from behind, this scene reminded Li Yiheng of the scene when his father took him for a walk when he was a child, and his father's broad shoulders were the safest reliance on him.

"Let's go, since I have rescued my son now, and I have already planned a way out, Lightning City is no longer a place where I am willing and able to stay, and this city is already in danger, only a foot away from the cliff. ”

Cheng Dong did not answer Diana and Tianhong's questions, and started the engine, and the body of the thunder loader had begun to move slowly.

Diana and Rainbow pouted, each sitting in the back seat of the thunder loader and no longer spoke.

Xiao Ji saw that the two women had already occupied the back seat, and there was no place for Li Yiheng, so he and Li Yiheng glanced at each other, Li Yiheng jumped on the protective bar of the back seat of the loading truck, and held the top horizontal bar with both hands to stabilize his body, and the thunder loading truck was like a mole shuttling underground, running towards the bright way out.

The five of them took the elevator back to the ground from the underground in Cheng Dong's laboratory, it was already midnight, Cheng Dong took Xiao Ran back to his room first, and when he came out again, he said solemnly to Li Yiheng: "Those soldiers can't be searched here for the time being, you can spend the night here first, but tomorrow, you have to go to fulfill my conditions." ”

Li Yiheng was also eager to save people at that time, so he agreed to Cheng Dong's request, now thinking about it, where did he go to find the source of those mucus energy bodies, and when the whole city was searching for them, didn't he just send himself into the tiger's mouth?!

But what has been promised, Cheng Dong must be explained, let Diana and Tianhong stay here temporarily, and he and Xiao Ji will go out.

Diana also wanted to go with Li Yiheng, and Li Yiheng persuaded Diana and Tianhong to stay here and have other plans on the grounds that this matter was inconvenient.

Li Yiheng and Xiao Ji still came out of the back door of Cheng Dong's house, looking at the mucus energy body in the ditch, there was only such a piece, but it was also a clue to appear in front of Cheng Dong's door.

Thinking of the iron tower not far from Cheng Dong's house, the strings of iron beads hanging on the mechanical shelves in the iron tower, I was in a hurry, and I didn't look carefully to see if it was made of iron, but I only saw their appearance and color and thought it was made of iron, and I thought of the Yin and Yang Twin Towers in Cape City, will they have the same purpose as the Yin and Yang Twin Towers?

The city was still bright by the moonlight, and only Li Yiheng's figure moved quickly on the empty street, jumped over the steam pipes erected on the street, and came to the secret door of the iron tower again.

The children in the tower had already fallen asleep, and Hou Ling had already left, Li Yiheng took advantage of the moonlight that came through the gap in the window and quietly climbed up along the mechanical frame, with very small movements, for fear of waking up the sleeping children.

Climbed to the first row of iron beads of the mechanical frame, which was already fifteen meters high from the ground, Li Yiheng rode on a horizontal iron frame, Xiao Yi stood in front of a string of iron beads nearby, leaned his nose over and sniffed, and vaguely smelled a faint fragrance.

Li Yiheng also leaned over, leaned forward to smell, and also smelled a very faint fragrance, but it was different from the fragrance of those energy bodies, which was an indescribable and pleasant pollen-like fragrance, and those energy bodies were the fragrance of the land.

Li Yiheng stretched out his hand and tried to touch it, as soon as he touched the surface of an iron bead, the whole string of iron beads began to surge, and the movement was very slight, like a silkworm chrysalis about to hatch, and then it returned to calm.

The surface of the beads is cold, not made of any metal, but more like some kind of colloid.

This time Li Yiheng also didn't care about the surging of the bead string, stretched out his hand to pull one down, no matter how hard he tried, the toughness of the bead string was abnormal, the more Li Yiheng strenched, the greater the reverse strength of the bead string, but the stretching length of the bead string was not half a finger.

Xiao Ji looked at Li Yiheng so hard, and whispered: "Since you can't pull it, it's better to cut it directly." ”

Li Yiheng just raised his right arm, and put it down angrily: The umbrella shield has been snatched by Chen Hu, where is the sharp weapon to cut it?

"It's not that you said, I almost forgot, I can't leave if I want to, the umbrella shield is still in that guy's hand, without the umbrella shield, there is no weapon. Li Yiheng hammered the horizontal bar under him, and the horizontal bar made a buzzing sound, but fortunately it was far away from the ground and did not affect the children below.

"Do you have any other way?" Li Yiheng hurriedly held the horizontal bar below with both hands to reduce the tremor of the horizontal bar.

Xiao Ji thought for a while, and said that there was no feasible way, and Li Yiheng also scratched his head, and there was nothing he could do.

"Since we suspect that those energy bodies have something to do with these beads, and the energy bodies are emerging from the ground, can we find some clues from the foundation of the iron tower?" Xiao Ji suddenly proposed.

"Why didn't I think of that?!" Li Yiheng slapped the sitting bar again, this time the movement was very slight.

Li Yiheng returned to the pedestal along the mechanical frame again, but saw the children staring at them with wide eyes, and they were forming a group, as if waiting for Li Yiheng to land, and the tall girl Er Lie Zhen led by him protected them behind him as usual.

Seeing that it was Li Yiheng, the children were relieved, ran over and surrounded Li Yiheng, and the quiet room became lively for a while.

Li Yiheng motioned for the children to be quiet first, and asked the children to do a favor, but the children suddenly stopped all their movements, and the room was as quiet as ever.

"Brother, well, uncle wants to ask you, have you found any other holes after living here for so long, such as leading to the underground?" Li Yiheng asked the children.

These children are particularly sensitive to sound because they have adapted to the dim environment, and the sound of Li Yiheng slapping the iron frame for the first time just now attracted Lie Zhen's attention, because he was afraid that the bad guys who came to arrest them, so they gathered together, because there was no place to escape here, and it was more dangerous outside than here, so Li Yiheng and Xiao Zhen's conversation, Lie Zhen also listened to a rough idea.

As soon as Li Yiheng asked, Lie Zhen picked up and said seriously: "Yes, it's under the base of the tower, but because we were worried that we would accidentally fall, we blocked it." ”

Hearing Lie Zhen's words, Li Yiheng came to his senses and hurriedly asked where the entrance to the cave was, so Lie Zhen took Li Yiheng to the corner of the pedestal, where there were many sundries, which should be discarded by these children every day.

Lie Zhen moved away from a wooden box next to the wide iron frame, under the wooden box was a severely corroded iron plate, Lie Zhen pointed to the iron plate and said, "Brother, I can't move this piece by myself, come on." ”

Li Yiheng lifted the corner of the iron plate, and a lot of corroded iron slag fell down, Li Yiheng's right hand was gently raised, revealing a hole the size of a water tank under the iron plate, and a cool breeze blew from the hole, indicating that the hole was connected.

After a few breaths, Xiao Ji flew out and said to Li Yiheng: "The passage here is narrow and complicated, and it seems to be very large. ”

Li Yiheng dismantled the wooden box, took a piece of wood, wrapped some torn clothes thrown away by the children, quickly warmed up with his right hand, lit the clothes for lighting, turned over, and told Lie Zhen to take the children back to it before leaving, not to watch, so as not to be in danger.

A little boy with a sharp object scratch on his forehead asked, "Uncle, is there a monster in there?"

Li Yiheng smiled and pinched the little boy's face: "There are monsters, and my uncle will catch them too." ”

The little boy nodded convincingly, and Li Yi held the torch horizontally and went into the hole with Xiao Ji.

As Xiao Ji said, the cave was still relatively spacious when he first entered, and several small passages had been scattered around it, the largest one was only enough for Li Yi to bend horizontally and drill into it, the small one was like a rat hole, and each hole had black colloidal pipes of corresponding thickness to the hole, and many branches were derived like human blood vessels.

"It's ironic that we're in a place where there's so much power overflowing that we need torches for lighting. Li Yiheng wasted no time in quipping, wanting to ease the atmosphere in this gloomy place.

Xiao Yi probed the way for Li Yiheng in front of him, and drilled into the largest hole behind him, but found that the further he went, the denser the distribution of those black colloids became, and in the end, Li Yiheng could no longer move forward, and only Xiao Yiheng's petite body could barely pass.

"It seems that these things have to be torn off, and it is good to know what is inside. Li Yiheng said and raised the torch to burn.

But it's also strange, the seemingly flammable colloid touches the flame, it can neither burn nor heat, and after removing the torch, it is still cold to the touch.

Li Yiheng pondered: "It's strange, there are still objects in this world that can't be burned." ”