At this moment, Liu Gan heard the rumbling sound again, and because he was squatting at the entrance of the passage, the rumbling sound was much clearer than before. He could now conclude that the rumbling sound was not the thunder coming from outside, but from the underground more than ten meters deep.

As for what terrible thing can make such a rumbling sound, it is unknown. You have to go there in person to find out clearly.

"Did you hear it?" Jiang Jinyuan asked Liu Gan, looking even more frightened.

"I heard it, I have heard it before, but you just didn't." Liu Gan's expression still seemed very calm.

"Then do we still have to go down?" Jiang Jinyuan asked Liu Gan again with a sad face. It was beneficial and harmful to find a tough character to serve as a guard for him. If it weren't for Liu Gan, he wouldn't have been able to arrive at the laboratory safely, but all this now is obviously not what he hoped.

Jiang Jinhara just wanted to restore the power of the building as soon as possible, restore the communication equipment of the building, and then contact the main city laboratory, and asked the main city laboratory to send airships or ships to pick him up, so that he could complete the task, and let the company give his wife and daughter a large amount of compensation as agreed before.

But now, Liu Gan obviously wanted him to go to the underground world below with him to adventure.

"Of course we have to go down. There was an unknown creature inside just now, which was a bit worrying. Now there is nothing inside. What are you still afraid of?" Liu Gan shone Jiang Jinyuan's face with a flashlight, and then shines it into the underground passage.

Judging from the display of the handheld computer, there was no one or zombie hidden under the ground except for the inexplicably disappeared yellow dot. However, in order to prevent accidents after entering, Liu Gan still pushed the iron door a few more times and pushed it open. Now the iron door has a passage of dozens of centimeters, and the crowbar is no longer used, so he can push it directly.

Although he was considering that he might encounter danger, Liu Gan decided to go on and investigate. In such a confidential place, he might find some powerful treasures? When playing games, it is impossible to get the legendary legendary equipment without taking risks.

After pushing the iron door open to the side to a sufficient width, Liu Gan and Jiang Jinyuan carefully went down the iron ladder to the empty room below. After coming to the room, Liu Gan shone around with a flashlight, but he could not find anything like a hatch door.

Is this a secret room?

"This wall should be an electrically driven mechanical door. Without electrically driven, it should be able to be pushed to the side." After exploring around, Jiang Jinyuan pointed to a certain wall and said to Liu Gan. Although this is in the game world, some special structures inside the laboratory are not much different from those of the three-domain company in the real world. Jiang Jinyuan is quite familiar with these designs.

Liu Gan walked over and looked at it. It felt as Jiang Jinhara said. The wall in front of him was probably a door as a whole. So Liu Gan tried to reach out and grabbed a place beside the wall and tugged it for a while. He found that the door was far thicker than the iron doors before, and there was a wheel groove below. With just a little force, he pushed the wall in front of him to the side, and exposed a passage in the corner of the wall.

Not long after the passage opened, a light suddenly came in from outside. The light was very bright and dazzling. It came out with the light, and there was also the rumbling sound of mechanical operation and the sizzling sound of some strong currents. Jiang Jinyuan was caught off guard and was almost screaming. Liu Gan seemed relatively calm, but he, who had been in the darkness, suddenly encountered these lights, made his eyes look very uncomfortable.

The light gradually weakened. After more than ten seconds, Liu Gan and Jiang Jinyuan, who had recovered their vision, discovered that outside the passage was an iron ladder with a platform, divided into seven or eight floors. Following the iron ladder, you could go down to the depths of the ground more than ten meters below. Outside was a huge space located at the bottom of the building.

When you walk out and stand on the iron ladder, you can see that the center of the space, where the yellow dot shown in the computer screen on your handheld is located, there is a spherical or ring-shaped electronic mechanism with a diameter of more than ten meters. The light just now came from the huge device.

If you look closely, it is not a spherical or ring-shaped mechanical device, but a sphere composed of three ring-shaped mechanical and electronic devices. The three rings are rotating slowly, so it looks like a spherical one.

As the light gradually dimmed, the rotation of the three rings also slowed down. When they slowed down, Liu Gan could see a platform in the center of the sphere, with a metal cabinet placed horizontally on the platform. If the yellow dot that appeared before meant something, I think the thing should be in that metal cabinet at this time. Judging from the historical detection data of the handheld computer, the coordinates and locations are very consistent.

I just don’t know why the yellow dot suddenly disappeared.

"Have you seen something similar before?" Liu Gan asked Jiang Jinyuan beside him. In some science fiction games, Liu Gan had also seen such huge high-tech electronic mechanical devices. Now, seeing the huge device not far away in front of him in immersive situations still makes him feel very shocked.

"No, but I think those rings should be magnetic energy generators. This large magnetic energy array is generally designed to study, isolate or shield certain unstable substances." Jiang Jinyuan observed the spherical device that was gradually losing its light and replied to Liu Gan for a few words.

"Magnetic energy generation device? Didn't you say that the building has no power supply? Why did it just emit such strong light and it would turn?" Liu Gan continued to ask Jiang Jinyuan a few words.

"When we came in, there was a thunderstorm outside. If I guessed correctly, there must be a lightning rod several hundred meters high on the roof of this building, which was enough to introduce lightning from the nearby sky into the device inside the building. The lightning in the sky is one of the sources of electricity for this magnetic energy generation device." Jiang Jinyuan continued to analyze.

"The lightning rod in this building is indeed a bit strange." Liu Gan nodded. He had always wondered why almost all the lightnings nearby were attracted by this building, and he had also guessed whether there was a secret in the building that needed to use these lightnings, but he didn't expect that he would guess it.

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Chapter completed!