A steaming breakfast is served in the dining car, with steaks, prawns, beautifully shaped dim sum and fruit.

After Ye Qing chose one by himself, he beckoned to these team members, "You haven't eaten breakfast yet, let's eat a little bit first." ”

Several team members became a little stiff, and the two flight attendants in front of them were the most beautiful flight attendants they had ever seen in their lives. The exquisitely shaped in-flight meals in front of them are comparable to Michelin-starred restaurants, and they are also the most extravagant in-flight meals they have ever seen.

In the past, when they were flying, the flight attendants usually only handed out a hamburger and a pack of snacks that children didn't want to eat.

With a throbbing and confused heart, several team members learned from Ye Qing with some restraint, staring at the big screen while eating breakfast.

The steak is as smooth as tofu in two bites.

One bite of prawns, and there are a lot of them in the dining car.

When these team members, who urgently needed to replenish their physical strength, ate all the food on the dining car, the green area on the screen had also covered the surrounding 30 kilometers with the scenic spot as the core.

Ye Qing ordered them a cup of morning tea, and asked them if there were caves in these areas of the screen while drinking tea.

Two members of the forest fire brigade thought for a long time and drew on several hills.

They said that these places were the mountains where they could be sure that there were caves, and there must be other areas, but the location was not clear.

"Then we can officially start searching. ”

Ye Qing smelled the tea and said, "I will find someone later, and I will trouble you to go to the rescue." ”

Wang Chailong wanted to ask how to find it, the kind of terrain radar that looked like science fiction just now was described as road construction.

And what about the 'search and rescue team members who climbed the mountain'?

Ming people don't say secret words, Wang Chailong doesn't believe that he can find out those college students by relying on one or several flying machines.

It's not that they haven't purchased search drones, and there are thousands to 10,000 DJI drones sold online.

That thing is flying in the Anya geological scenic spot, and it is simply a food delivery. Not to mention the rain, a little mountain wind can blow it down.

This question was quickly solved.

Some of the team members had quietly bumped him with their hands and motioned for him to look out of the porthole.

A drone the size of a mountain eagle flew out of the back cabin of the suspended banshee flying machine opposite.

Then came the second one.

Fourth.

Sixth.

The ninth.

The banshee flew a dumpling, and black drones poured out of the rear cabin. Wang Chailong only counted more than 30 planes, and he was confused by his own counting.

Ninety crosses in all.

At this time, the sun has cast dark clouds, shallow projections on the earth.

Ninety black drones, accompanied by heavy rain, are not afraid of any wind and rain at all.

With the 3D terrain data collected earlier, these drones can automatically match the terrain and avoid obstacles on the mountain for fast flight.

The drones automatically assign scanning areas, and each drone is responsible for two or three hills.

They float five meters above the mountain and fly quickly, and once there are tall trees in front of them, the drones will calmly avoid them and then continue to stick to the ground.

The picture that appeared on the row of small screens in the cabin was not the video surveillance screen imagined by Wang Chailong and the others.

It's a radar-like green spider web, and each radar map corresponds to a mountain.

Of course, this radar map is not large, and can only cover one percent of a mountain.

But it moves fast, and the radar net grabs faster than a person can run on flat ground on a magnified virtual mountain map.

Wang Chai Long was shocked: "You use radar to find people??"

"It's not radar. Ye Qing motioned for them not to make a fuss and explained: "Traditional radar cannot detect biological targets, and the working principle of radar is to use the electromagnetic waves reflected by objects for detection. The human body is mostly made up of carbohydrates, and electromagnetic waves can easily penetrate the human body. In complex terrain environments, people are equivalent to stealth in electromagnetic waves. ”

Wang Chailong nodded again as if he didn't understand, he understood why he asked the other party how to search yesterday, and the other party said that he explained the true meaning that you don't understand.

It's just literally incomprehensible.

Ye Qing tried his best to solve his doubts in an easy-to-understand way, "Let me ask you, if you are replaced by those college students, how will you save yourself after being trapped?"

They are good at this question, and several search team members are competing for the answer.

Some people say that when there is no signal on the mobile phone, find a way to collect dry branches and light them, and then sprinkle them with damp leaves to create the most primitive and effective smoke distress signal.

Some people say that they can make a simple megaphone out of the materials around them, and then arrange for the people around them to shout every fifteen minutes.

There is also a reasonable distribution of the last food, without drying branches, cover the clothes with you, use them as a fire starter, wait for the rain to stop, light the clothes, and slowly dry the firewood.

Or when the weather is clear, use the object in your hand that can be reflected, as a reflector, to send optical signals, and so on.

There are many ways, and these team members really can't figure it out.

Unless these nine college students are all hung up, even if they are stupid pigs these days, they can use the tools around them to send signals to the search team.

Don't underestimate the ability of humans to survive in a desperate situation, not to mention that these are nine college students, and they are not stupid at all.

Ye Qing nodded thoughtfully, the self-help plans proposed by these professionals are the simplest kind.

If they are really replaced with missing college students, it is estimated that several members of the search team can regard the disappearance as an outdoor trip to free their minds, and they will come back as soon as they want to.

Ye Qing continued to ask, "Then you say, did these nine college students bring mobile phones?"

"Of course you bring, are there college students in this world who don't bring their mobile phones when they go out?" Wang Chailong felt that this question was unnecessary, judging from the information obtained by the parents of these students, these college students not only brought mobile phones, but also had a power bank.

But in the vast mountains, what is the use of them bringing mobile phones and power banks, they carry a generator on their backs and have no signal for them to use!

"Herein lies the problem. Ye Qing, who was sitting on the chair, spread his hands, "These students must have mobile phones and even power banks." ”

"From the most basic method of self-help, these students are trapped when they are trapped and there is no signal on their mobile phones. I will definitely choose to turn off the mobile phone, and then turn on the nine mobile phones in turn, one is likely to get a signal for help, and the other is that the light and sound of the mobile phone can also comfort them. ”

"Nine mobile phones, plus a few power banks. ”

"Don't say five days, even if you stick to it for a month, it's fine. ”

That's right, and several members of the search team kept nodding.

Don't......

Wang Chailong thought of a possibility, could it be that those drones are carrying small base stations on their backs?

Wang Chai Long was frightened by his own idea, if this is the case, then it is really possible to find those college students. This seems to be a new idea for search and rescue in the mountains, and we must think about it carefully when we go back.

"It's not a base station. ”

Ye Qing shook his head, "Look at the screen, the radar grids actually represent the electromagnetic radiation situation in this area. ”

"The base station is for mobile phone calls and Internet access, and it requires a certain signal strength to establish contact. ”

"Let's assume that these college students' mobile phones are turned off, or they are in a sealed environment that isolates the signal, isn't the base station blind?"

"Those drones have high-sensitivity electromagnetic radiation detectors. ”

"This detector can monitor the electric field range between 0.01 and 1999 volt meters. and the magnetic field range between 0.01 and 1999 nanotesla. ”

That is to say, whether these college students have mobile phones with them or not, whether they have turned them off or not, or whether they are trapped in a closed environment. ”

"As long as they carry their electronic devices with them and they don't drain the last trace of power, even if they are turned off, they can still be detected by our detection devices. ”

After Ye Qing finished explaining, several members of the search team exchanged glances with each other.

It seems to understand again, but it sounds super powerful, super technological!

"Come~"

"We continued to drink tea and refresh our spirits so that we could go down and rescue those college students. ”

Several members of the search team immediately sat obediently on the chairs next to them, one by one, their chests full of boiling blood.

……

"Dudu~"

Before the tea was finished, a shrill alarm suddenly came to mind in the cabin.

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