Bai Xiao touched the rock door and studied it repeatedly, but he couldn't find an open mechanism.

This rock door was added for no reason, blocking the original steel door, and it was as thick as a mountain.

"Damn, this old man is really going to die here!" He came to this conclusion.

The rock gate was originally supported by a bracket, but after Yin Gang destroyed the bracket, it fell in free fall, and there was no device to lift it.

With such a heavy rock, even if a crane is driven in, it may not be able to be lifted.

Unless it's shattered by a bomb.

However, the bomb shattered it, and it is estimated that the entire underground building also blew up.

"Is there no way?" Han Momo was very disappointed. In the past, I could only move on the second and third floors, and I was not allowed to come to the basement floor.

I searched all over the two floors, but I really couldn't find any exit.

"Don't worry, there's no way to get there." Bai Xiao comforted Han Momo.

He thought back to the way he had come, and estimated that he had fallen from a well into an underground river, and then stumbled upon it.

The distance I walked in the underground river is not far, which means that this underground world is still under the Lixiang Garden.

Now it can explain why Yingang buys so many building materials.

They were used to build the underworld.

It would have been inconvenient if all the building materials had gone through the well in the backyard when he was building.

So, it is conceivable that he must have dug a tunnel under his house to come down.

Excavating and building such a large place inevitably involves noise, and if he doesn't want to be discovered, this underground world should be within the yard of his house.

And that well should be just another entrance and exit of the three caves of the cunning rabbit!

So, if the exit of the underground river is blocked, there must still be that tunnel to get out!

Bai Xiao explained his thoughts to Han Momo in detail.

"Underground passages?" Han Momo repeated the word, "Does this mean that the underground passage is not necessarily on the top floor of this building?" But you can connect anywhere? ”

"It should be."

The two of them immediately went into action, first carefully searching the basement level.

The main method, of course, is to hit the wall with a hammer to see where the sound is more empty.

However, no wall sounded empty.

Bai Xiao stood on the steps to rest, overlooking the entire underground floor.

It is mainly used for the layout of reservoirs and power generation equipment.

The water in the cistern is brought in from the underground river outside, through a waterwheel.

Each reservoir has a high drop from each other, and the water flows to form a waterfall, and the kinetic energy of the waterfall is used to generate electricity.

"Yin Gang is very smart, but it's a pity that he is crooked. You really shouldn't have come in, he caused you to hide in Tibet, and you can't get out now. Han Momo was worried about Bai Xiao.

This reminded Bai Xiao, and he suddenly remembered that when he escaped from the ventilation pipe a few days ago and hid in the highest reservoir, he found that there was a big hole underneath and was blocked by an iron fence.

Why is there such a big hole? Where does this hole lead?

He wanted to find out.

"Wait, I'll go down and have a look." He jumped into the water.

"Hey, you're not well from a cold! Be careful! Han Momo didn't have time to stop him, he looked at the water worriedly, he was really not at ease, he jumped into the water and chased him to the bottom.

Thankfully, she arrived and helped him open the rusty iron fence.

She couldn't hold her breath anymore and floated to the surface for air.

When she came down again, Bai Xiao was gone.

She thought to herself that he must have entered the hole, and swam in without hesitation.