"Reliable enough positioning device?"

He Wei looked at Lu Ming with some doubts: "The mobile phone in your hand is reliable enough." Except for a few places, as long as you are on Earth, you can be located. ”

"It's not enough."

Lu Ming shook his head: "What I want is the kind of positioning device that is absolutely reliable, no matter where I am, whether it is under the sea, underground, even if it is thousands of meters underground, it can locate me." ”

Zhang Dingshan said: "You should know very well that our human technology can't do it. ”

Lu Ming is indeed very aware of this.

The existing positioning technology, whether it is base station positioning or satellite positioning, relies on the transmission of electromagnetic waves. The frequencies of electromagnetic waves, from low to high, are radio waves – radio waves used for communication, infrared, visible light, ultraviolet rays, X-rays, and gamma rays.

However, the penetration ability of electromagnetic waves of all frequencies is not very strong. It can even be said that all radio communication technologies are completely ineffective in the face of obstacles that are only about 100 meters thick, such as rocks, soil or water.

This obviously does not meet Lu Ming's requirements.

But what he is asking about is not human technology.

Your Planetary Security Agency's Thirteen Divisions are specialized in dealing with "supernatural forces". You should have experienced and seen a lot of super technology.

Haven't you studied these extraterrestrial technologies or creations? Are there any results? Or is there something extraterrestrial that can do that?

Lu Ming looked at Zhang Dingshan, he knew that Zhang Dingshan understood what he meant.

Zhang Dingshan pondered for a moment and said, "Tell me what you think." ”

Lu Ming said: "My idea is very simple. ”

He gritted his teeth, "If there's such a device, I'll take it to that metal room!" After that, you use this device to locate me! ”

Because Lu Ming had already entered the metal room—this metal room was most likely the abode of the mountain god, the presumed transit station that existed on the earth—and positioned Lu Ming's location, so he naturally located the location of the transfer station.

What to do after that is as simple as that. It's nothing more than mobilizing men and equipment to get there, and entering the transit station on a large scale. When the time comes, whether to destroy or control depends on the will of human beings.

For the existing level of science and technology of human civilization, this scheme has a very huge loophole. That is, the electromagnetic wave signals used by humans for positioning are very likely to be transmitted from the relay station to the outside world!

Not to mention that the transfer station may have been shielded there, even if there is none, who can be sure that the location of the transfer station is the surface?

Is it possible that it is at the bottom of the sea? Is it possible to be in the belly of the mountain? Or underground?

Even in tunnels, human positioning and communication devices will face the problem of failure, let alone underground, underwater, and even hundreds of meters, thousands of meters, and maybe even deeper than the mountainside!

Any positioning device will fail.

Therefore, it is necessary to have a "reliable enough" positioning device as Lu Ming said, and this plan can be regarded as meaningful.

"Previously, the images left by the core members of the X organization showed that they could bring some things with them into the transit station, such as clothes and accessories. If there really is a reliable enough positioning device, I can carry it myself, and there is a high probability that I can bring it in! ”

Zhang Dingshan and He Wei's expressions both became serious.

He Wei first said: "So, Lu Ming, have you ever thought about a question - even if this kind of device exists, you have successfully brought it into the transfer station, and we have successfully located your location, but if the location is located...... But in places we can't reach, so what to do? ”

Even the Mariana Trench can be reached by human-made submersibles. Even the moon can be reached by human-made spacecraft.

But what if the location is farther away than the moon – on a cosmic scale, it can be considered near the Earth, or 10 km, 20 km, 100 km or even deeper underground?

With the current technology of mankind, it is simply impossible to complete such a deep rescue. At that time, even if Lu Ming and the location of the transfer station were successfully located, they could only watch Lu Ming wait for death.

This is a possibility that must be taken into account.

Lu Ming gritted his teeth: "I know this possibility. But I still want to give it a try. ”

He Wei was stunned.

She felt that she didn't know Lu Ming again.

Lu Ming is just an ordinary person. He...... Where did you get such courage?

Even if you are yourself, you can't guarantee that you will make such a decision in the face of such a situation.

Lu Ming didn't explain too much, just looked at Zhang Dingshan and He Wei firmly.

Zhang Dingshan said solemnly: "Lu Ming, are you sure?" ”

Lu Ming nodded firmly: "I'm sure." ”

Zhang Dingshan looked at Lu Ming's eyes seriously, and after a long time, he said slowly: "I'm not sure if there is an absolutely reliable positioning device that you want." I need to gather some experts to look at it. ”

"Okay."

For the rest of the time, Lu Ming stayed here.

Although it is only a temporary landing site, it has all the facilities you need. The makeshift dwellings are not only electric, but also air-conditioned, hot-water and even internet-connected.

Every day's meals are provided by a special person, and after eating and drinking, Lu Ming can even take a walk around the landing site and take a look at the scenery accompanied by security personnel.

And so it was, and so three days passed. Three days later, Lu Ming received a call from Zhang Dingshan, who was at the headquarters.

"You need an absolutely reliable positioning device, we have it."

Lu Ming felt a little excited. But after the excitement, it was full of doubts.

With his knowledge, he could not imagine what principles and mechanisms would be needed to create a device that was "absolutely reliable" and could send information wherever he was.

"During one of our investigations, we seized a device that we didn't know where it came from. We don't know for sure what the device does, and we haven't found any impact on the surrounding environment, except that a huge amount of neutrinos will be produced when the device is triggered. Let's call it the neutrino bomb.

We intend to use this neutrino bomb as your positioning device. ”

Neutrino?

Lu Ming was stunned for a moment, and then immediately reacted.

If this unknown device, named the "neutrino bomb", can really produce a large enough number of neutrinos, then it can indeed be used to complete the "absolutely reliable" positioning!

This is because neutrinos have very little mass and are electrically neutral. It does not participate in electromagnetic and strong interactions, but is only affected by gravity and weak interactions. But at the microscopic particle level, the gravitational and weak forces are so small that they have little to no effect on it.

This means that neutrinos are super penetrating. It can even penetrate the entire earth and the entire sun without hindrance, or from the center of the Milky Way, through the distance of tens of thousands of light years, through the barrier of countless stars and dust clouds, and reach the earth smoothly.

According to scientific statistics, on average, about 65 billion neutrinos pass through every square centimeter of area every second. On average, every day, the body of any adult on Earth is traversed by a total of about 400 billion neutrinos.

But as a result, there are so many neutrinos that they do not have any impact on the human body or the environment. Because they will penetrate almost everything without hindrance, flying out from the other side of the earth.

Theoretically speaking, no matter where the mountain god's abode, that is, the transit station, is located, even if it is located in the core of the earth, it is blocked by thousands of kilometers of rock formations from the earth's surface, or what kind of signal shielding is made, it is impossible to block the penetration of neutrinos.

If the device, named the "neutrino bomb", were to be detonated inside the Yamagami's residence, a huge amount of neutrino radiation would inevitably pass through it.

Whereas...... With the current technology of mankind, the detection of neutrinos can be completed.

Neutrino telescopes built hundreds or even thousands of meters deep underground can rely on their large enough size to maximize the interception rate of neutrinos.

Even if only one in one qualitaire per square centimeter is average, only one in the average quadrillion billion neutrinos will be intercepted by the neutrino telescope, as long as the number of neutrinos released by this neutrino bomb is large enough, as long as the volume of the neutrino telescope is large enough, there will always be so many neutrinos observed in the "neutrino radiation burst" caused by the neutrino bomb.

The energy of the neutrino can be used to determine whether the detected neutrino was emitted by the "neutrino radiation burst". Through the angle of incidence of the neutrino, it is possible to reverse the direction of its flight.

Since neutrinos are not reflected or scattered during flight, it is easy to deduce the direction of the neutrino radiation source after reversing the direction of flight after knowing the direction of the neutrino telescope and the angle of incidence of the neutrino.

But that's not enough. The reason is simple, assuming that the neutrino radiation source is confirmed to the west of the neutrino telescope through calculations, but the distance cannot be determined.

Is it a kilometer in the west, or 10 kilometers, or 10,000 kilometers?

I don't know the distance, I only know the direction, and it still doesn't make sense.

This requires at least two neutrino telescopes at different locations to observe it at the same time, measuring two directions and making two straight lines. Then, extend these two straight lines, and their intersection must be the location of the neutrino radiation source.

Because the neutrino bomb has been brought into the mountain god's residence by Lu Ming, then, the location of the neutrino radiation source is the location of the mountain god's residence.