From the moment this "Ohio-class" strategic nuclear submarine began to explore along that submarine cable, their end was already doomed.

The "South Heavenly Gate" project is absolutely secret, and anyone who wants to explore the truth will be devastated by the origin.

Of course, this is only relative to the ships of other countries, because they are completely out of their control.

If it is Huaxia's ships and ships, the origin does not mind using other more gentle, without losing ships and personnel, to mislead the other party and minimize the possibility of exposing himself.

However, there are still certain risks.

On the return trip, Ye Fan took the underwater submarine of the Origin Kai and rushed to the South China Sea at a speed of 300 knots, and Ye Fan was also ready to return.

Along the way, through the messages displayed on the display screen, Ye Fan could also clearly see that there were intelligent robots coming and going along the way, as well as submarines constantly transporting materials and liquid metal plates.

Such a large-scale submarine project can be concealed for such a long time before it was discovered by this "Nautilus" strategic nuclear submarine, and the concealment is already very strong.

After all, ships and submarines don't sit idle all day to scan the bottom of the sea, they just want to explore the underwater hydrological data and topography in the vicinity.

It is precisely because of this that the submarine moving at a speed of 300 knots on the bottom of the sea will be detected, as well as the submarine cable used for communication.

Why use a submarine cable?

Because without this, Origin would not be able to control such a huge underwater robot, as well as the Iron Legion troops of more than a dozen submarines.

The submarine cable is still the main road, and the small section of antenna that the giant signal tower looks out of is only corrected for packet loss and delay through satellite signals.

Without this cable, it would not just be a small antenna that would have surfaced from the water, but a whole signal tower the size of a buoy that detects waves, completely exposed to the sea.

It's hard to think like this without being discovered.

"Is there stealth and concealment at the bottom of the sea? This is indeed a problem, today's nuclear submarine, can make an accident out of concealment, if the next time the military's South China Sea Fleet,

When I was doing a drill, I accidentally found it along the cable, and it would be difficult to do. Ye Fan also touched his chin and pondered at this time.

Soon, he opened the system and began to look for technology that could be redeemed in the system.

He wanted to find a way to avoid being recognized by sonar on the bottom of the sea, after all, the visibility on the bottom of the sea is very low, even if it is a submarine with portholes, the visibility is only a few tens of meters at most.

Whether you can see the road surface clearly at the bottom of the sea depends on sonar.

After half an hour of searching, Ye Fan finally found a technology that was more in line with the current application, and the current level of science and technology was completely created.

The principle of sonar is similar to the ultrasonic detection of bats, using sound waves to scan the front, using the frequency of echoes to determine the distance and azimuth of the target, and can also scan the terrain.

With Ye Fan's current technology, it is completely possible to build an armor that absorbs sonar, which is the so-called sound-absorbing metal, which can almost completely isolate sound. Seek the magic TXT

Unlike Captain America's shield, this sound-dampening metal can only be used for sound insulation, and can only be made by adding some special ores to the liquid metal.

However, if you use sound-dampening metal to absorb all the sonar, it will be easier to identify.

Because it is very simple, the sonar that is generally emitted will bounce back within a specific time and then be accepted by the passive sonar device.

If the entire sound-dampening metal is directly absorbed, it will become a phenomenon that everything around it will bounce sonar, but only this cable and specific devices will not bounce sonar.

Like a blank sheet of paper, the sonar sweep is like splashing ink, and the position and terrain are determined by the different concentrations of the ink, while the position of the cable is particularly black, and the rest of the place is light black, so it is exposed.

If the sound-absorbing metal scheme is used, the entire paper is dyed white, but the only place with sound-absorbing metal is white, and it is not dyed black in the slightest, so that you can see at once that there must be something underwater, and it will also be exposed.

So Ye Fan found another alternative and a new choice.

【Sonic Diffuse Reflective Coating】

This coating is like a liquid metal, which can be shaped when applied to electricity, and its properties are like sound-dampening metal, which also absorbs sound waves.

However, this kind of sound wave diffuse coating absorbs the sound and transmits the sound to the other end of the plating to emit it again.

In this way, the possibility of being detected by sonar is reduced to a minimum.

It's just that this thing still looks a bit magical, and the exchange price is relatively expensive, reaching 10,000 prestige points.

"This thing seems to be pretty good, system, exchange for sonic diffuse plating." Ye Fan opened his mouth and said to the system.

"Ding Dong, the exchange is successful, the sonic diffuse reflection plating has been exchanged, consuming 10,000 reputation points, and the remaining 61,018 reputation points."

When the sound of the system fell, Ye Fan felt a familiar feeling in his mind, every time he asked the system to exchange something, the system would inject technology into his mind and memory.

This also caused Ye Fan to be a little dizzy, but after a minute or two, when his brain got used to it, he could completely adapt to it.

After the exchange was completed, Ye Fan directly skipped the introduction page of the sonic diffuse reflection coating and directly clicked on the more detailed effect.

If an obstacle is compared to a wooden plank, then under normal circumstances, when the sound waves are transmitted to the wooden board, the wooden board will directly reflect the sound waves back after absorbing a certain amount of sound.

If the front and back sides of the board are coated with a diffuse reflection coating of sound waves, the sound waves will be directly weakened when the sound waves are transmitted to the front of the board.

In other words, the so-called "diffuse reflection" method dissipates the sound waves, so that they can no longer bounce back.

At the same time, the back of the board will receive the same signal, and the sound of the same size and frequency will be emitted, or according to the original direction, the original trajectory, and everything will not change at all.

When the sound waves on the back of the board are emitted, and when they hit an obstacle, they are reflected back and reflected on the back of the board again.