How does it feel to hang upside down on the top of the passage and then try to climb forward? Xu Yi thinks that if he can get out of here successfully, he will sell a lot if he can write a book about his experience.

It's a real James Bond! You are so cool! Xu Yi joked with himself in his heart to prevent himself from falling asleep. Now what he does is not much different from rock climbing, even more physical. Now it's almost early in the morning, but he still hasn't slept all night. Coupled with the overdraft of so much physical strength, he has already fallen into a state of drowsiness.

But Xu Yi can't sleep. He hangs upside down on the top of the cleaner's passage, and there are rows of cleaning robots under him. Once he falls, these bucket like cleaning robots will fall down one by one like dominoes. It will be hard for him not to be found out.

As for sleeping upside down, Xu Yi is not a high-end skill that only exists in martial arts novels. Even back in the world of martial arts novels, he can only be regarded as a running sophomore at best.

It's too ordinary to be more ordinary.

But now Xu Yi is doing what may be the coolest thing in the world. He's like an agent, invading the tightly guarded forbidden area, in order to save his trapped sister - if his sister is not dead now, the story will be more perfect.

Xu Yi's muscles have begun to feel sore. This kind of hanging upside down is a heavy burden on his hands. It can't be completed as long as his willpower is strong enough.

He felt like he was going to fall at any time.

I'm sorry. I should have written a suicide note. There is a smile of self mockery on Xu Yi's face. If he dies in such a place, maybe he won't be found until his body stinks? Wait, will these cleaning robots clean up my body?

Xu Yi began to think wildly. He had to do this to keep his mind awake. In this spiral passage, there was no light around him. He had no idea how far he had climbed, how long he had climbed, and how much distance was waiting for him. Under such conditions, weariness is not only easy to break his body, but also easy to break his spirit.

He has to keep his brain going so that he doesn't faint and fall.

Suddenly, Xu Yi's ears moved. He seemed to hear something - the sound of current flowing when the appliance was turned on.

Hallucinations, or? Xu Yi looks under himself.

All the cleaning robots started at this moment, and their chests were all lit up with green lights. It's six o'clock sharp now. It's time for people to clean the machines and start working.

It's like a neat army marching forward, and the robots under Xu Yi start to move upward - they will go to the top, and then clean up layer by layer from top to bottom. When they finish cleaning all the floors and return to the first floor, they will line up to return to this spiral cleaner passage. But Xu Yi doesn't know the operation logic of these robots. He can only see these guys with flashing green on their chest passing under him in line. This experience is really indescribable.

Xu Yi suddenly thought of something. He looked at the end of the cleaning robot team. Sure enough, these robots are leaving here, and the spiral channel is slowly empty. When the last robot leaves him, he can jump down.

After five minutes of waiting, the last cleaning machine slowly passed under him.

Without the slightest hesitation, he pulled off the track tied to one of his hands, and his body immediately fell from above. When he pulled off the other track, he was all at the bottom of the cleaner's tunnel.

Dong. He fell to the ground with a loud crash.

Before he could get up from the ground, his body slipped down. This spiral passage is like a super long slide. If you don't pay attention to it, it will slide down directly. Thanks to Xu Yi's crawler, he caught the suction of the crawler and steadied himself after sliding down a little.

Let me sleep like this first. Lying here, Xu Yi can't help thinking.

"No, no!" Xu Yi shook his head hard. "I can't sleep, I must not sleep!" He was not sure if anyone would come to check the passage. It was not a place for him to rest.

What's more, his sister Xu Lingshan's body is still in each other's hands.

What would these people do with their sister's body? Xu Yi does not dare to think about this problem at all. Since this organization is under the guise of scientific research, it must have dissected her sister's corpse long ago, right? Can I really find my sister's body? Or are all you can find are incubators running around your sister's organs? Xu Yi shakes his head again, trying to get these ideas out of his mind.

With tears in his eyes and teeth clenched, he grabbed the track in his hand and climbed up.

The height of the building is more than 400 meters, and the curved spiral pipe is more than 1000 meters long. Xu Yi has to climb from the bottom to the top, which is not much different from finishing an extra long climb.

Xu Yi's sports performance is quite good. Although compared with Zhou Heng, he is not good at anything, but among ordinary students, his physical fitness is good.But to finish the climb, his physical strength is still a little tight.

Although it's much easier to climb below than to move above, even so, Xu Yi's physical strength is gradually losing. His lips are white, his eyelids are more and more heavy, and his body is as dull as a machine without lubrication. When his brain gives instructions, his body can't even keep up with it at the first time.

Most of all, his climbing speed is getting slower and slower.

I'm so sleepy and I want to have a rest. In the lack of light environment, Xu Yi's brain has been tired to the point of hallucination.

Xu Yi's body suddenly slides down after a mistake.

When he reacts and uses the track with weaker and weaker suction on his hand to firmly hold the floor, he has already slid down a long section. At least twenty minutes of effort was wasted by his absence.

And his arm also slipped out of countless slender blood marks because of this mistake.

Damn it! Xu Yi clenched his lower lip hard, and the pain made him sober a little.

He climbed up again.

...

it took three hours and another three hours for Xu Yi to see a little light. It was the exit, the exit of this cleaner passage.

But Xu Yi didn't expect that someone had been waiting for him.