Lao Wei said that although the information provided on each report was different, every time he read the reports, there were only four words left in his mind: "no abnormality".

After surveying for so long, he didn't find any anomalies, which made Lao Wei even more determined that the abyss under the ground should not exist at all.

It takes a long time for Li Huaishan and Yan Yin to transport the equipment deep into the mountains. Liu Shangang returned to the pool in the evening of the third day.

After he came back, he didn't bother to rest, and immediately started to modify the drone, and after forty hours of fighting, he finally changed all seven drones to the way I wanted.

After test flights, it was found that these drones not only have a long control distance, but also become more stable, but because there are too many things on them, the power consumption is also relatively large.

You can't find fault with this kind of thing, Liu Shangang has done a good job.

Seeing the improved drone, Lao Wei immediately became excited, after waiting for so many days, he was tired of waiting, so he wanted to hurry to the ground.

This time, Zhuang Youxue didn't stop him again.

I can feel that Zhuang Youxue is very eager for this exploration to end quickly, and he doesn't seem to want the upcoming second group of people to participate in this operation.

In the afternoon of the same day, Lao Zuo and I accompanied Lao Wei and his party into the drainage hole, each of us had a quadrotor drone in our hands, but only Tang Yan had a remote control in his hand.

Mr. Liu said that it was very difficult to buy a message device to improve the remote control, and it took him a lot of effort to get one.

We followed the stone steps to the edge of the cave, Lao Wei and his two students first made steel nails on the wall, and then put steel cables on them, and tied themselves firmly, and Tang Yan also tied the remote control to his hands.

This place is really weird, and if you stand on the edge of the cave without some protection, you will probably not be able to suppress the urge to jump straight in.

Lao Wei and the three of them are responsible for probing the situation inside the abyss at the entrance of the cave, while Lao Zuo and I are responsible for taking care of the drone.

When everything was cleaned up, Tang Yan controlled the first drone and descended into the abyss.

After being transformed by Liu Shangang, the sound of these four-winged drones was quite loud when they started, and the echo in this place was very strong, and the "sudden" sound of the spiral wing was endless for a while.

But with the rapid descent of the drone, the sound of the propeller gradually became smaller.

During this period, Lao Wei often asked about the descent distance of the drone, and the time he asked was very accurate, almost every time he asked, the drone dropped exactly 100 meters.

After the drone descended 500 meters, the ghost eye could no longer see it, but because the environment was very quiet, a slight "sudden" sound could still be heard.

After a while, the sound suddenly died down.

Tang Yan quickly swung the remote control in his hand a few times, which may have no effect, so he said to Lao Wei: "The drone has disappeared." ”

Since Lao Zuo and I were present, they both used Mandarin when communicating.

Huang Chenyu asked on the side: "What does it mean to disappear?" Is the drone out of control? ”

"No," Tang Yan shook his head: "I just dropped about a thousand meters, and I haven't exceeded the control distance, there is no wind in the abyss, and the drone has been flying very steadily, but after a thousand meters, there is no signal on the screen of the remote control." ”

"How do you know it's flying steadily?" Lao Wei asked.

Tang Yan pointed to the small screen on the remote control: "This provides wind sensing data and the tilt angle of the fuselage, all the way, the wind has been one level down, and the tilt angle of the fuselage is only seven or eight degrees at most." ”

I remember that before Liu Shangang modified the remote control, there was no screen on it, but I didn't expect that no matter how many LCD screens there are now, it can also be the wind data and the tilt angle of the fuselage.

This Liu Shangang is not only proficient in the transformation of various devices, but also quite meticulous.

When the first drone disappeared into the abyss, the people present didn't particularly care, after all, it had gone a thousand meters deep, even if the remote control could not receive the signal, it was normal, besides, the situation in the abyss was definitely different from the outside, here, the transmission distance of the electronic signal was likely to be shortened.

It is precisely because the situation under consideration may be more complicated that the drone we put down is also the worst performing of the five machines.

After that, we put a second drone down.

The drone descended for a thousand meters in the darkness and then disappeared again.

Tang Yan said that the data on the LCD screen was suddenly reset to zero, and at that moment, the drone could not send back any signal, and this time the drone was really missing when it dropped to a thousand meters.

Two drones disappeared inexplicably in the same location one after another, which made everyone present become dignified.

It is not clear to anyone what exactly caused the mysterious disappearance of the drone.

At that time, I was thinking that maybe there was also a broken space under this great abyss, but then Tang Yan and Huang Chenyu did an experiment that completely overturned my conjecture.

They first stretched the connection line between the drone and the camera, and then lowered the drone into the abyss.

The line is five or six meters long after it is pulled up, and the camera itself is relatively light, so it will not break the wire, Huang Chenyu wants to use this way to observe whether the camera will be damaged after sinking into a kilometer, and what kind of damage will occur.

Tang Yan let the drone descend for a thousand meters, and when he was about to get close to the place where the first two planes disappeared, he controlled the remote control to let the drone hover in mid-air, and then he waited for nearly half an hour before letting the drone rise again.

When the drone flew back, I found that the camera was still there.

If there is really a broken space under the abyss, after the camera sinks in, it will be 100% transmitted to another space, and the only thing the drone can bring back is a piece of disconnected wire.

Lao Wei and Huang Chenyu took a closer look at the camera hanging on the wire, and did not find the slightest damage on it, but on the surface of the camera, a very thin layer of fog was covered.

Huang Chenyu looked a little disappointed: "I was still thinking just now that there might be an acid pool under the abyss, but these mist are obviously ordinary moisture." ”

Lao Wei said: "It is also possible that the magnetic field below the abyss is too strong, causing the electrical signal to be unable to transmit normally. ”

Tang Yan immediately spoke: "The eldest brother surnamed Liu has installed a magnetic sensor device on the drone, and the magnetic field strength displayed on the LCD screen has always been close to the normal leyline magnetic field, and there has been no fluctuation. ”

Lao Wei shook his head: "In an abyss like this, the change in the internal magnetic field is not something we can predict, or it may be that the magnetic field in the first half of the abyss is normal, but after going deep for a thousand meters, the magnetic field will change extremely." ”

I found that when the three of them were talking, I couldn't interject at all, and Lao Zuo, like me, didn't interject for a long time.

It wasn't until the three of them stopped talking at the same time that Lao Zuo spoke: "Since the camera is not damaged, it should be able to capture something." ”

Hearing Zuo Youdao say this, Lao Wei raised his hand and patted his thigh as if he had just come back to his senses, and shouted with some excitement: "Then let's go out first and bring up what the camera recorded to see." ”

This guy is also the fastest master, and while talking, he began to untie the steel ropes on his body.

Everyone wanted to know what was under the abyss, and everyone returned to the camp as fast as they could, finding Lao Wei's laptop.

Lao Wei excitedly called up the content recorded by the camera to view, but what could be presented on the computer screen was only a touch of darkness.

Since the interface for playing the video only occupies a small window, outside this window, you can still see the system desktop of Linux (a desktop system different from indos), so we can all be sure that it is not a black screen on the computer.

Lao Wei's brows twisted into a hard pimple: "What's the matter, what's going on, there's a problem with the memory reader?" ”

As he spoke, a white beam of light appeared on the screen, flashing rapidly from the left side of the window to the right, and then quickly flickering back again, and finally fixed in the center of the display window.

This is the beam of light shining from the drone, and the reason why the picture did not appear just now should be because the camera was facing away from the light at the time, but fortunately it is now turned around.

After that, the drone descended smoothly and the camera did not move, keeping an eye on the lights shining from above.

Then, in the afterglow, we can faintly see a section of stone wall at the edge of the abyss, which should have been burned by the flames, and the traces of sulfide can be seen from time to time.

The same scene lasted for a full ten minutes, and when the progress bar moved to ten and five seconds, the image was once again a sheer black color.

This time, Lao Wei didn't mention any memory readers, just stared at the screen, including me and Lao Zuo, and all the people in the tent held their breath.

At that moment, the beam of light that appeared on the screen suddenly disappeared, and there was no shaking during this time, and it can be determined that the reason why the picture turned black was not because of the shaking of the camera.

Before that, there was only a slight wind sound coming from the computer's speaker, but now, we heard a very strange noise.

Boom- Boom-

The sound was extremely stiff and long, like two huge stones grinding slowly in the dark, and the body of these two stones could be unimaginably large, because the grinding sound continued for half an hour.

It wasn't until the drone started to pick up, the beams appeared, and the noise died down that we remembered to turn up the sound and turn the progress bar back to half an hour ago.

When the sound was amplified, we heard not only a louder grinding sound, but also an extremely long air sound.

Heh-huh-heh-huh-

It would take a full fifteen minutes just to breathe, as if an incomprehensible behemoth was slowly wheezing underground.

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