Zi Yang followed Lao Wang's gesture and looked up. At this time, the above of the cave had been covered by sandstorms. The only light disappeared. The wind and sand blew against the ground and made sharp screams. The dust and sand rustled down, and a thick layer was already covered on the ground.

Lao Wang said, "Temur said that the scale of this sandstorm is very large and may last for a long time. Maybe quicksand will come in later, and the entrance of the cave may be buried..."

While skillfully rolling up the mountaineering rope that you had just used, Lao Wang continued to say, "When you went for a walk with Xiao Hei, Su Rui had already detected it with instruments. The caves here are connected and the air is enough for us to breathe. Don't worry for the time being. We are ready to explore this underground passage and maybe we will find another exit."

Lao Wang said the above words in a nagging manner, then looked at Zi Yang with dissatisfaction. The meaning was very obvious. Everyone was busy, and you two idle people were doing nothing.

Lao Wang paused for a moment and added: "If we really can't find the exit, we can come back again. Anyway, our equipment is quite complete, so it's not difficult to open the hole - as long as we don't fall into any huge rock."

Zi Yang stopped saying a word. It was obvious that when he and Xiao Hei were not around just now, a small meeting was held here.

He knew that no one else could listen to him except Xiao Hei, and his leadership was no longer in his hands, and Lao Wang had already betrayed!

Su Rui said with apologies, "I'm sorry for dragging you down to such a situation. If I have a chance in the future, I will..."

Zi Yang held her hand up and firmly pushed back the second half of her promise: "Life and death are still unpredictable, and we will talk about what will happen in the future."

Zi Yang felt a little frustrated now. He blamed Alexander for dragging everyone down to such a situation, which also affected Su Rui. However, now he is lying on the ground and half-dead, so he is embarrassed to criticize him again.

Seeing Zi Yang's face was gloomy, Su Rui didn't say much. He took out a mini laptop from his luggage and backpack, then took out an instrument that looked like a hairdryer, and linked the line at the bottom with the laptop. Soon, the grid lines and operation windows filled with English appeared on the display screen.

Su Rui half-kneeled on the ground, put the notebook on his other knee, turned on the "hair dryer" in his hand, and a thin octagonal net was automatically opened on his head. Su Rui aimed the net port at the channel and pressed a button.

"bite……"

The "hair dryer" made a harsh sound. Although the sound was not loud, the penetration force was extremely strong, which made people feel uncomfortable when they heard it. As the sound vibrated, Zi Yang saw the green coils fluctuating on the screen.

Su Rui introduced, "This is a 3D stereo sonar detector designed by the doctor for cave exploration. It is positioned through the echo of sound waves on the wall. The sound waves will rebound and weaken when encountering obstacles. The computer collects feedback signals and can calculate the distance, shape, and even texture of the obstacles encountered. Then, through complex calculations and mapping by the software, the entire cave shape will be displayed in three-dimensional form."

Zi Yang couldn't help but approach and asked, "How far can this thing detect?"

Su Rui said, "After the sound wave rebounds on the wall, the accuracy will continue to weaken, and the accuracy is proportional to the intensity of the sound wave. Our scientific research-grade portable detection range is about 50 meters, and we must also consider the size of the cave and the complexity of the terrain."

Su Rui then added, "Although it is not as far away as the engineering and military level, its accuracy is far beyond them. You see, based on the density, thickness, distortion of the coils on the screen, and comparison parameters, the outline of the hole can be clearly seen."

While the two of them were talking, the computer software had carefully calculated the sounds fed back by the sound waves and drawn them with lines. Everyone looked at the computer screen, and green lines were intertwined and entangled. At this time, you could see the precise appearance of the hole without Su Rui introducing them.

"I didn't expect this thing to be so small and has such a big effect." Zi Yang saw that the hair dryer was as big as an electric fan when it opened, but Su Rui looked very light, holding the computer with one hand and the detector with the other, which was not at all laborious.

Su Rui said, "These instruments are made of carbon fiber and ceramic materials. The main material is aviation metal. They are small in size and light in weight. If you don't believe it, try it."

Zi Yang clanged his hands with his hands. Sure enough, the black instrument looked heavy, but it was extremely light in his hand. He couldn't help but sigh in his heart that the black technology of foreigners is really amazing.

The old king next door was chanting, "Be gentle, be gentle, we can't afford to lose such a valuable thing if it breaks." He looked at the computer screen and said in surprise, "Good, you can draw so clearly and such awesome things to sell for a lot of money, right?"

Su Rui smiled slightly and did not answer him.

Zi Yang pointed to one end of the computer screen and said, "You see, the signal seems to have weakened a lot here, and the coils in other places are closed, but there is no one here, which is a bit confusing and very blurry."

Su Rui nodded and said, "It means that the channel here has not reached its end yet. The sound waves will gradually decay in the air. If there is no obstacle after transmission, it will slowly weaken until it disappears. This unclosed state will be displayed on the computer screen."

Old Wang next door patted his butt and stood up, "What are you waiting for? Let's open the way and explore while walking. With such a powerful thing in your hand, you can walk with confidence and boldness with your eyes closed - I think, let's turn off the headlight and change the small flashlight. If you run out of power, it will be embarrassing."

After everyone came down, Su Rui turned on an LED headlight. The lamp was like a helmet, as big as Lao Wang's head. It was designed very cleverly, and it could be carried by hand. The light could diverge 360°, illuminating the entire hole clearly.

Su Rui said, "Don't worry about electricity. This LED lamp can last 72 hours under this brightness state. The hole situation is complicated. We don't need to consider the issue of energy saving for the time being. We should still see the surrounding situation clearly first..."

Su Rui's voice was a little alert, it seemed that the psychological shadow left by Yan Hun on her was still there.

Old Wang next door said again, "I have never seen such a bright headlight last for so long. What battery is it? It is better than those black technology phones that charge 5 minutes and talk for 10 hours and standby 7 days!"

Zi Yang said while speaking, "Military-grade? The things used by the army are generally better than those used by the civilian-grade ones. Our ordinary mobile phone battery is good for three days to standby. They have more military-grade functions. It will be fine if they play for a week or two. You can call when the battery is used up!"

The last bragging words made Su Rui laugh too.

"You are right. Military-grade things are indeed much more advanced than civilians, but our equipment is even more advanced. Most of them are scientific research-grade and are specially made in laboratories. Because of the high cost and the difficulty of manufacturing, the military has not yet been popularized."

Lao Wang shouted again, "Be good, this is so expensive, even the extravagant American military can't afford it!" As he said, he groped through the LED headlight and couldn't let go: "Hey, it's not hot at all, Lao Li, you can touch it too!"

Su Rui said: "Let me say that, most of the instruments we brought are more than enough to pay the full amount of funds for this scientific research activity."

Lao Wang opened his mouth wide and couldn't hold it back. The Mediterranean group of people were in chaos for some money, and they could only use any instrument to cover the cost of the entire tour group. This level is really a 100,000-mile gap.

Thinking of the fact that they had thrown a lot of equipment to stop the giant lizard, they suddenly regretted it. How much did they throw it away inadvertently!

Zi Yang asked, "What is Alexander's origin? These equipment seems to have exceeded the scope of the normal scientific expedition team, and even the US special forces may not be able to afford these equipment." Zi Yang finally understood why Alexander tried hard to protect these instruments and equipment.

But he had deeper doubts in his heart. These people came to Lop Nur with such expensive instruments, obviously they had already mastered a lot of information here, otherwise they would not have prepared such cave exploration equipment in the desert. The question is how much do they know about the situation here?

With Su Rui and other instruments as the foundation, everyone felt much more at ease. They counted the good supplies and had no shortage of food, mainly fresh water, which could only last for about three days.

At the moment, Su Rui used sonar to explore and draw in front, Zi Yang and Lao Wang carried Alexander on a stretcher. Xiao Hei carried the headlights and shone the road behind. Each of the four people carried a large mountaineering bag, which contained all the instruments and supplies of the expedition team.

Finally, he walked along Timur and carried a lot of things on his body. Oh, Timur was carrying a camel leg.

While several people were chatting, Timur took a sharp scimitar and took off a camel leg from the side. Although his technique was not as neat and domineering as A Chong, it was also so skillful that it was surprising.

When he was doing this, everyone looked around silently. Everyone knew that Timur had his own philosophy of survival in the desert. Maybe when he was out of ammunition and food, he had to rely on his rich desert survival experience... although this cunning guy might not be able to work with them.

Under Su Rui's leadership, everyone moved forward slowly. Su Rui used a sonar detector to draw every few dozen meters. The passage went down with a slow slope. The more you walked, the more you became more shocked. The passage seemed to have no end. After walking for hundreds of meters, it was already a vertical distance of dozens of meters from the ground.

There are other forks next to the passage from time to time. The large ones can accommodate people in and out, and the small ones are as thick as Lao Wang's head.

Su Rui uses sonar to detect each hole. A huge 3D hole with the same root system has been mapped on the laptop. Except for the passage they are walking on, the other forks are gradually thinning. Although the terminal cannot be detected in some places, it can be seen that the diameter of the coil has shrunk and ultimately cannot be allowed to pass by the adults.
Chapter completed!