Professor Liu put down the rope, and I tied the rope to Zhao Yu'er's waist, and after a while, Professor Liu and several others dragged Zhao Yu'er up. In the end, it was me, after the same routine, and I was smoothly pulled up.

"Nie Yu, why are you and Zhao Yu'er in this hole, what is there here?" Professor Liu and Wu Shirong leaned their heads and looked inside.

"It's nothing, there's nothing in there, by the way, why don't you have anything? How did Zhao Yuer and I fall into that ice cellar? "We are obviously together, how can there be such a big difference?

"We don't know, we were scattered during the flood yesterday, and we went to that dirt pit, and then we all climbed out and couldn't find you two. Who would have thought that there was a small hole next to it, and you two actually got into it. Professor Liu handed us two compressed biscuits to eat as he spoke, and Zhao Lili and Du Dabao brought us freshly boiled hot water.

"Professor Liu, have you found any ruins and ancient tombs in this pit?" I stood up and looked around, and there was little sign of artificiality.

"I haven't found anything special yet, but just now I stepped on the ground with my foot, and it seems to be empty, and we were digging down where we were looking for it when we found the hole you fell into."

"Zhao Yu'er, are you okay, my good sister!" Zhao Lili hugged Zhao Yuer and shed two lines of tears, and the two sisters hugged each other tightly .......

Yesterday's violent flood washed us away for more than a dozen miles, and now we are back in the pit we had been in when we first arrived. There was no water in the big dirt pit, and something must have drained it from below.

Professor Liu and his senior classmates began to dig, and Wu Shirong and Du Dabao and I began to tie ropes around their waists to prevent them from hollowing out and falling to the bottom and not being able to get up.

It's nine o'clock in the morning, and we've been digging for two hours and there's nothing but dirt and dirt. While we were resting next to us, a muffled sound made our ears tingle.

Looking back, the place we had just excavated had collapsed, but luckily we weren't on it, and if we were, we would have been stoned to death inside. Professor Liu and his senior classmates began to clean up the surrounding soil, and Zhao Yuer and I hurriedly ran over to help. In less than half an hour, the entire collapsed loose soil was dug up. A large stone door was revealed.

"Professor Liu, look, there is a huge stone gate here! It's definitely a man-made building, but it looks like it's just opened. "I looked at the stone door, the middle of the stone door seemed to have been opened recently, and there was a gap of more than ten centimeters in the middle of the door, and the gap turned out to be the mark of a hard object, leaving white gravel.

"It looks like someone opened it just a short time ago, everyone be careful, let's go in now and see what's inside!" After Professor Liu finished speaking, more than a dozen of us began to push this stone gate, the stone gate was really heavy, and I used almost the strength to eat milk.

Finally, after pushing it several times, the heavy stone gate revealed a small gap under the power of more than a dozen people. We continued to knock with the shovel, and the gap grew bigger and bigger. There was another push, and the stone door finally opened.

We turned on our flashlights and walked inside. The entrance to this cave is surrounded by concrete structure, and the surface of the cement brush is a modern building, which would not have been in ancient times.

"Professor Liu, you see, this place is all made of reinforced concrete, shouldn't we come here?" I felt as if I was in the wrong place, and with my gut feeling we would go home empty-handed.

"Of course, this is a modern building, but such a large hole cannot be an air-raid shelter or military equipment, why make an air-raid shelter in such a sparsely populated place, if it is a hidden military project, there must be some obvious signs on it, but there is nothing here. We must find out what is going on, and the bones of the team members who died ten years ago are around here, and we must find out why they died! The more Professor Liu spoke, the more excited he became, and we followed him closely.

This underground passage is more than ten meters wide and five or six meters high. Moreover, the ventilation equipment in the cave is actually modern, with huge exhaust equipment and voice-activated electric lights. There is also a small white hole at the entrance above that is used to exchange air, and it seems that the construction of this hole requires a lot of manpower and material resources.

We quickly reached the deepest part of the cave, and on the left was a small black tin door. I pushed, but I couldn't push. It seems to be locked by the people inside.

"What should I do if Professor Liu can't push it?" I bumped it on the shoulder, but it still didn't open the door.

"I'll try, you guys get out of the way!" Du Dabao walked over, and his loud voice shook us so much that our eardrums hurt.

"Boom!" A loud bang came, and the weight of the Duda Bao Erbai came to pound against the heavy iron door. The iron door still didn't move, and he seemed to be angry, and slammed into it again.

"Goo-dong!" A loud bang came again, and this time the heavy black iron door fell down at once, and the ground shook into a cloud of dust. After a while, the dust cleared. We turned on our flashlights and walked in.

This is a narrow passage with four large words on it, "Safe Passage", and the passage is twice a green indicator light. The lights on the backup power seemed to be running out, and the indicator lights were flashing on and off. As we walked on, there was a power distribution operation room on the right, which was only available in the factory.

"Professor Liu, look! The opposite door seems to be different from the others, and the door seems to slide from side to side, and it seems to be an electric metal gate. If we want to open that door, we have to find out where the main power source is. "I shone my flashlight around and made sure there wasn't any other exit other than this door.

"Okay, we've got to find out where the main power switch is!"

"Goo-dong, goo-dong!" There was a loud bang from inside the electric gate, and I quickly put my ear to hear if it was from someone, but the loud noise almost shattered my ears, and I walked back to the power distribution room.

Now the situation is very clear. We have now walked here from the big earthen pit, opened the stone gate and a small iron door, and finally the electric gate is the key. All we have to do is open the electric gate and we can enter the inside of this underground castle to see what is going on.

The team members are tired now, and there is a huge heating stove in this power distribution room, as well as a few barrels of gasoline. I poured some gasoline into the stove and lit it. A roaring flame ignited, and we took off our wet clothes, and soon our bodies were dry and warm. We ate crushed biscuits in our backpacks, drank some water, and rested for about twenty minutes.

I was attracted by a big red gate on the console in the switchroom, and although I was not a science student, I knew that the red gate was usually the controller of the main switch. I pushed the gate and it was completely closed, but nothing happened, and I looked down the bottom of the gate, where a wire as thick as a small bowl stretched all the way to the top of the ceiling.

"Professor Liu, do you think the wire will be broken, if we connect the wire, we can restore the power, right?"

"It should be, if this power distribution room is an electric control switch, there must be a corresponding controller on the other side of the wire, we go to the controller over there to connect the electricity, maybe we can let this power distribution room transmit power to all locations."

"Okay, Professor Liu, you are here to take care of this power distribution room, and Wu Shirong and I will go up and see if we can find the gate of that wire." After saying that, Du Dabao picked me up, and as soon as I reached out and grabbed the opening of the roof, I got into it at once.

Then Wu Shirong also climbed up, and the two of us could barely look up in the vent, and there was cold metal all around.

"Nie Yu, don't fart, my head is on your ass, please!" Wu Shirong suddenly said such brain-dead words.

"Don't worry, I've been eating compressed biscuits for the past few days, I haven't eaten anything good, even if I fart, it doesn't stink, haha!" I grabbed my flashlight and continued to crawl forward on all fours.

We don't know where to climb by now, and a ventilation duct seems to have gone to another room, but I don't care so much, just follow this black wire and hopefully restore power to the whole system.