They walked for a long time, one after the other, and when they passed a corner, they finally approached the point of exploration. It was brighter than the rest of the place, and from time to time the sound of electronic interference sounded.

Zhao Yifan lowered his body, beckoned Wei Yi to lie down together, and slowly climbed behind a few piles of rocks. He made a silent gesture to Wei Yi, and he cautiously poked out half of his face and examined it. Suddenly, he tensed, as if he had seen something extremely surprising.

Wei Yi saw Zhao Yifan's nervousness, and felt that something was wrong, so he hurriedly poked out half of his face from the other side and checked it.

In the distance, in the light, several millstone-sized caverns abruptly recessed into the walls. There are many glowing rattans around the cave. There is a small lake on the ground, and at the moment many rattan sticks into the water, trying to draw the water and making a "gurgling" sound. On the shore of the lake, there are several flashing electronic instruments, which are constantly emitting the sound of electronic interference.

Wei Yi quietly turned back to the back of the rock and looked at Zhao Yifan, and coincidentally, the other party also turned his head to look at him.

They glanced at each other, and Zhao Yifan waved his hand back at him, motioning for Wei Yi and him to leave here for the time being. Wei Yi nodded, and slowly retreated with Zhao Yifan.

They crouched on the ground and cautiously crawled backwards for some distance. Wei Yi lowered his voice and asked, "Is there any other way to go besides here?" ”

Zhao Yifan shook his head and replied in a low voice: "There is no detector anymore, and it is likely to be more dangerous to take other roads." Our understanding of the underground world has always remained on the surface. ”

Wei Yi lay on the ground and listened intently for a while. The sound of rattan wriggling and the sound of "gurgling" water came from underground. "What now?" Wei Yi asked with his head sideways.

Zhao Yifan stroked his forehead and thought for a moment, but he didn't have a clue. Now deep underground, the environment is complicated, and the equipment at hand is extremely limited, if you take a detour, you really don't know the blessing and the curse. If these rattans are alarmed, if they attract more, the consequences will be unimaginable. It's likely that everyone will be buried underground.

He finally shook his head, wanting to ask Wei Yi if there was any good way. But before he could open his mouth to ask, he saw Wei Yi first pressing his hand towards him, and then lowered his head again and listened attentively.

After a moment, Wei Yi looked happy, pointed to the exploration point, and climbed over first. Zhao Yifan didn't know why, so he hurriedly followed.

They quickly climbed behind the pile of rocks again, and each peered out to check it out. There was so little water in the lake that the rattans were slowly burrowing into the holes in the walls, and they were soon gone.

"They need water." Wei Yi said in a low voice, "We have to avoid places where there is water. ”

Zhao Yifan hurriedly unloaded his backpack, took out the map, spread it on the ground, and studied it carefully with Wei Yi.

The passage detected by the detector has many bends and forks, and Zhao Yifan marked the possible water sources one by one. After studying for a while, they finally settled on a passage that was a little far away, but there was no water source, as the final course of action.

After they had discussed this, they set off at once. As he passed through the caves in the walls, Wei Yi tried to look inside. In the far distance, there seems to be some light.

"Maybe it's those weird glowing rattans." Wei Yi thought so in his heart, and walked forward quickly with Zhao Yifan. As he passed the underground lake, he glanced there meaningfully.

The water in the lake has almost dried up, and there seems to be only a shallow layer of water. But to his surprise, there seemed to be quite a few fish swimming in the water.

"Look, there's fish in the water. Why didn't those monsters eat all of this? Wei Yu asked strangely.

"Maybe it's full. If you're full and you stuff something into your stomach, you won't be able to stuff it. Zhao Yifan returned a little casually.

"I'll go down and have a look." After Wei Yi finished speaking, he groped his way to the bottom of the lake. Zhao Yifan couldn't, so he had to go down later.

Although the water at the bottom of the lake was much shallower, it was not above Wei Yi's knees. He walked slowly to the center of the lake. The fish in the lake were frightened and fled in all directions, some burrowing into the caves at the bottom of the lake, and some swimming to the edge of the lake in circles.

"It's weird." Wei Yi groped at the bottom of the lake for a long time and found nothing. He shone it with a strong flashlight, looked at it carefully for a while, and finally could only beckon Zhao Yifan to go back in disappointment.

"Maybe it's full, as you say." Wei Yi climbed up the passage and walked back to the cave in front of the wall, puzzled for a long time, and finally had to give up.

They continued to probe along the passage. When they found out the route, they immediately returned the way they came.

Although it took a lot of time to go back and forth, a safe route was finally discovered. As soon as Wei Yi and Zhao Yifan came back, they immediately accelerated the progress of the entire team.

The underground world can't tell the difference between night and dark, and the surviving people have traveled all the way, and they don't know how long they have walked, and finally reached their destination safely.

It is a metal wall embedded in the rock wall, which indicates that it is covered with dust and dirt, and there are many rocks scattered around the ground.

"Wait a minute." Zhao Yifan shouted to stop the advancing team, and he commanded the robot to clean up the surrounding rocks. As soon as the rock was cleared, a metal manhole cover appeared in its original place.

"This is the entrance." Zhao Yifan said happily to the people around him. He took out an ID card and opened the metal manhole cover, revealing a groove. He inserted the ID card into the groove, and a flash of light flashed and the ID card was swallowed inside. Everyone was shocked to find that the ground under their feet suddenly changed something.

It was a messy rock passage, and it was quickly tidying itself up, and it only took a moment to become extremely clean and tidy. At the corner of the passage, a metal door fell, isolating everyone from the outside world.

Countless lights were lit up in an instant, and everyone's location was illuminated as if it were day. Everyone covered their eyes so as not to be stung by the bright light.

Wei Yi covered his eyes with his hands, and the bright light pierced his eyes. His ears pricked up nervously, carefully listening to what was going on around him. The sound of "squeak and rattle" rang out continuously.

Wei Yi barely opened his eyes, and saw the metal wall in front of him rise, revealing a deep passageway. The entire passage is extremely bright, but there is no illuminated equipment in sight. He blinked, adjusted, lowered his hands, and looked around.

The whole rock passage has changed dramatically. There seems to be some kind of glowing substance on the rock wall, glowing on its own. The place where the crowd was located was already very brightly illuminated.

"Let's go, everyone come in with me." Zhao Yifan led everyone in. After they all entered the passage, the metal gate slowly lowered again, sealing the entrance tightly.

Under the leadership of Zhao Yifan, everyone walked another hundred meters before walking out of the passage. Everyone was amazed by what they saw. For the first time, they knew that deep underground in the place where they had once lived, there was such a huge structure.

Wei Yi looked at a huge display screen in front of him and was speechless for a long time. Above that is the layout of the entire underground military base. There are nearly a dozen floors in the entire base, and there are three outer floors. There are hundreds of rooms on each floor, and each room is hundreds of square meters in size.

"Let's go, let's find a place to settle down first, and then seal off all entrances and exits as soon as possible. Now is not the time to lament that. Zhao Yifan saw everyone's shock, and he hurriedly reminded him.

Wei Yi came to his senses at this time. He hurriedly studied it with Zhao Yifan, found a few nearby rooms, and began to settle everyone.

After doing all this, the surviving police officers, under the command of Zhao Yifan, went to the entrances and exits in groups to block them. Wei Yi was still in a group with Zhao Yifan, with a few people, and blocked the entrances and exits that were assigned according to the map.

The few places they were assigned to were the northwestern of the map, which was considered the farthest. They had entered the base from the southeast, and now they had to rush to the northwest, and they had really chosen the most difficult task.

According to Zhao Yifan, they don't have much time left. If you don't get to the northwest entrance and exit within two hours, and start blocking it immediately, the consequences could be fatal. This is a very difficult task.

"When was this place built? It's big enough. A police officer asked.

"It was centuries ago. It has been deserted, and then it has been renovated several times, but it has never been of much use, and the cost of maintenance is too high, and the gains outweigh the losses, and then it was abandoned again. Zhao Yifan simply returned.

"In such a big place, if you just walk, you can't walk for a few days, right? How do we get to the mission location in two hours? Wei Yu asked out loud.

"Of course, we can't just walk, we have to use transportation. Not far from here, there is a transport hub that provides quick access to every entrance and exit. I just don't know if it's still available. Zhao Yifan hurriedly led the way in front, and said without looking back.

"What if it doesn't work?" Wei Yu asked.

Zhao Yifan paused, took a few steps and said, "In that case, we can only find a car and try to rush there." If it's too late..."

He stopped where he was, turned his head to scan everyone, and said in a deep voice, "If it's too late, someone must stay outside the door and manually close the entrance." ”

Everyone fell silent for an instant. Everyone continued to walk without saying a word. After a while, Wei Yi asked aloud, "Is there only one way to choose to close the entrance?" Wouldn't it be okay to block the passage? ”

"I'm afraid not." Zhao Yifan hurriedly led the way in front, and said as he walked, "The air here is self-contained, if the passage is closed, we must choose to block the vents, otherwise, it will be useless, and in that case, we will probably have more tasks to complete." Only by blocking the entrances and exits can the source of danger be completely isolated. ”

"Self-contained?" Wei Yi asked puzzledly, "How can it be self-contained?" Isn't it the air coming down from the ground? ”

"It's made." Zhao Yifan still said as he walked, "Splitting water, producing hydrogen and oxygen, then separating, and then supplying oxygen to the people here, and collecting hydrogen as fuel." ”

"What if the collection is full?"

"When it's full, it's released, and there's a special discharge chamber."

"What if there is an open flame?"

"There is no such eventuality, it is completely sealed, and it is a separate place from the entire base. Unless you open that room, that won't happen. ”

They walked for a while, asking and answering, and came to a metal door. Zhao Yifan took out his ID card as usual, opened the metal door, and walked in first.

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