There was a steaming hot breakfast in the dining car. There were steaks, prawns, and delicately shaped snacks and fruits.
After Ye Qing chose one for himself, he called out to the team members, "You haven't had breakfast yet, right? Eat something first."
Several team members' bodies became a little stiff. The two flight attendants in front of them were the most beautiful flight attendants they had ever seen in their lives. The exquisite in-flight meals in front of them were comparable to Michelin restaurants, and they were also the most extravagant in-flight meals they had ever seen.
In the past, when they took a plane, the flight attendants usually only gave them a hamburger and a pack of snacks that even children didn't want to eat.
Carrying a throbbing and confused heart, the several team members somewhat cautiously imitated Ye Qing, eating breakfast while staring at the big screen.
The steak was as smooth and tender as tofu in two bites.
There were still a lot of prawns in the dining car.
When these team members, who urgently needed to replenish their strength, ate all the food on the dining car in big mouthfuls. The green area on the screen had already covered a range of 30 kilometers around the scenic area.
Ye Qing ordered a cup of morning tea for them. While drinking tea, he asked them if there were any karst caves in these areas on the screen.
The two members of the forest fire department thought for a long time and drew on a few mountains.
They said that these were the mountains where they could confirm the existence of karst caves. There must be other areas, but the location was not clear.
"Then we can officially start the search."
Ye Qing smelled the tea and said, "When we find them later, I'll have to trouble you to go and rescue them."
Wang Chailong really wanted to ask how to find them. The terrain radar that looked very sci-fi just now was described as road construction.
What about the "mountain search and rescue team"?
A straightforward person didn't beat around the bush. Wang Chailong didn't believe that they could find the college students with one or a few flying machines.
It wasn't that they hadn't purchased search drones before. The DJI drones sold online were only a few thousand to ten thousand.
That thing flying in the Anya Geological Scenic Area was simply delivering food. Not to mention a rainy day, a slightly stronger mountain wind could blow it down.
This question was quickly answered.
A team member had already quietly nudged him with his hand, indicating that he should look out the porthole.
A drone the size of an eagle flew out from the rear cabin of the Banshee flying machine.
Then the second one.
The fourth one.
The sixth one.
The ninth plane.
The Banshee aircraft began to drop dumplings, and black drones poured out from the rear cabin. Wang Chailong was confused by his own count when he reached the thirtieth plane.
There were ninety of them in total.
At this moment, the sun had already shone through the dark clouds and shone on the ground.
Ninety black drones descended from the sky along with the heavy rain. They were not afraid of any storm at all.
With the 3D terrain data previously collected, these drones could automatically match the terrain, thus avoiding the obstacles on the mountain and flying quickly.
The drones were automatically assigned to scan the area. Each drone was responsible for two to three mountains.
They floated five meters above the mountain and flew quickly. Once there were tall trees in front of them, the drones would easily go around them and continue to stay close to the ground.
The images that appeared on the rows of small screens in the cabin were not the surveillance footage that Wang Chailong and the others had imagined.
It was a green spiderweb map that looked like a radar. Each radar map corresponded to a mountain.
Of course, the radar network was not very large. It could only cover one percent of a mountain.
However, it moved very quickly. The speed at which the radar network swept across the magnified virtual mountain map was faster than a person running on flat ground.
Wang Chailong was shocked. "You're using radar to find people?"
"It's not radar." Ye Qing signaled them not to make a fuss and explained, "Traditional radar can't find biological targets. The principle of radar is to use electromagnetic waves reflected by objects to detect. Most of the human body is made of carbohydrates, so electromagnetic waves can easily penetrate the human body. In a complex terrain environment, people are equivalent to invisible in electromagnetic waves. "
Wang Chailong nodded again, not fully understanding. He understood why when he asked the other party how to search yesterday, the other party said that he would not understand the real meaning even if he explained it.
He did not understand the literal meaning.
Ye Qing tried to solve his doubts in a simple way. "Let me ask you, if you were the university students, how would you save yourselves after being trapped?"
They were good at this question. Several members of the search team fought to give the answer.
Someone said that in a situation where there was no phone signal, they would find a way to collect dry branches, light them, and sprinkle wet leaves to create the most primitive and effective smoke signal for help.
Someone said that they would use the materials around them to make a simple loudspeaker and then arrange for the people around them to shout every fifteen minutes.
There was also a reasonable distribution of the last bit of food. If there were no dry branches, they would dry their clothes and use them as fire starters. When the rain stopped, they would light the clothes and slowly dry the firewood.
Or when the weather was clear, they would use reflective objects in their hands as mirrors to send out optical signals and so on.
There were many ways, but these team members really did not understand.
Unless these nine university students were all dead, they would have been able to use the tools around them to send out signals to the search team even if they were as stupid as pigs.
Do not underestimate the ability of humans to survive in desperate situations. Moreover, these were nine university students. They were not stupid at all.
Ye Qing nodded thoughtfully. The self-rescue plans proposed by these professionals were the simplest.
If they were really the missing university students, the search team members would probably treat the disappearance as an outdoor trip to let their minds fly. They could come back whenever they wanted.
Ye Qing continued to ask, "Then do you think these nine university students brought their cell phones?"
"Of course they did. Are there university students in this world who don't bring their cell phones when they go out?" Wang Chailong felt that this question was unnecessary. From the information obtained from the investigation of these students' parents, these university students not only brought their cell phones, but also a power bank.
But in the vast mountains, what was the use of bringing their cell phones and power banks? Even if they carried a generator, there would be no signal for them to use!
"That's the problem." Ye Qing, who was sitting on the chair, spread out his hands, "These students must have brought their cell phones or even power banks."
"Then from the most basic analysis of self-rescue, these students would have chosen to turn off the phone when they were trapped and there was no signal on their cell phones. They will definitely choose to turn off their phones, and then turn on the nine phones one by one. Firstly, they might get a signal to call for help. Secondly, the light and sound of the phones can also comfort them.
"Nine cell phones and a few power banks."
"Not to mention five days, even if it lasted for a month, it would not be a problem."
This made sense. The search team members kept nodding.
Could it be …
Wang Chailong thought of a possibility. Could it be that those drones carried a small base station?
Wang Chailong was shocked by his own idea. If that was the case, then it was possible to find these university students. This seemed to be a new idea for mountain search and rescue. He had to think about it carefully when he went back.
"It's not a base station."
Ye Qing shook his head, "Look at the screen. The radar grid actually represents the electromagnetic radiation situation in this area."
"The base station is for mobile phone call and Internet service. It requires a certain signal strength to establish contact."
"Let's assume that these university students' cell phones are turned off, or they are in a sealed environment that isolates the signal. Wouldn't the base station be at a loss?"
"Those unmanned aerial vehicles are equipped with highly sensitive electromagnetic radiation detectors," Li Yao said.
"This detector can detect the electric field range between 0.01 and 1999 Volts. And the magnetic field range between 0.01 and 1999 Tesla. "
"In other words, whether these university students have cell phones or not, whether they are turned off, and whether they are trapped in a sealed environment or not."
"As long as they carry electronic devices with them, and the electronic devices have not exhausted the last trace of power, even if they are turned off, they can still be detected by our detection equipment."
After Ye Qing finished his explanation, several search team members exchanged glances with each other.
He didn't quite understand it, but it sounded super awesome and super futuristic!
"Come on ~"
"Let's continue to drink tea and restore our energy so that we can go and rescue those university students."
Several search team members immediately sat on the chairs next to them. Each of them rubbed their hands, and their chests were full of boiling blood.
…
"Du du ~"
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