Things went back a month ago.

After Zhengxin and Yishu Group built islands in the South China Sea, the maritime patrol line in the South China Sea that was blocked was fully opened. A Chinese submarine force stationed near Sanya re-formed a cruise route, and after more than ten years, it began an international water cruise route starting from the South China Sea.

This submarine force in Sanya is affiliated to the Chinese Navy's South China Sea Fleet. It is equipped with a Han-class nuclear-powered boat, a Xia-class ballistic missile nuclear-powered boat, and two Song-class conventional-powered submarines. In addition, there are more than a dozen R-class boats that have been in service for more than fifteen years.

These submarines, except for the three new generation of "national-name" submarines independently developed by my country, are relatively advanced, and are all outdated goods that are facing elimination.

In order to meet the increasingly complex international marine environment, the fleet recently introduced a batch of "Song of Warsaw".

This submarine was originally the most successful conventional submarine developed in the Soviet Navy era. It is mainly used for anti-ship and anti-submarine warfare in shallow waters offshore areas. It is famous for its powerful firepower and low noise. Later, it was modernized and modified by Russia and other modifications, and it was formed into a Kilo-class improved model. It is currently one of the quietest diesel-electric submarines in the world.

After adaptive transformation, this batch of conventionally powered submarines were charged into the South China Sea Fleet to perform cruise training missions.

On the day when Li Fanyu was waving in Japan, a scene that shocked the Chinese Navy happened;

On that day, the South China Sea Fleet Submarine 3 formation was a Han-class attack submarine, and two Kilo-class conventional powered submarines dived from the southern part of Apo Reef to the international waters.

However, less than an hour after leaving the sea, the Kilo-class 079 boats in charge of navigation were found to have continuously proactive sonars to detect the formation.

Immediately, another Kilo-class 080 boat was also found to be exposed. Just two minutes later, the "da da" sound representing the enemy's active sonar signal in the Han-class 054 boat also rang continuously!

After three hours of getting rid of it, the formation still did not leave the other party's sonar detection range.

Among them, the 054 boat encountered a cliff under the sea while diving in an emergency. Although it escaped from the emergency response of all the officers and soldiers of the boat and escaped from the tragedy of being crushed, the boat was still seriously damaged.

During this period, the three submarines encountered seven simulated attacks. That is to say, if the other party had not wanted to open fire, the three submarines had already sunk seven times!

After the 054 boat had no choice but to float to the surface, it was discovered that the only one who actively conducted sonar detection and launched a simulated attack on the formation was a maritime anti-submarine aircraft with the American flag printed on it!

Although he had no life worries, this incident caused the entire South China Sea Fleet and Xing Yaxin, who was stationed in the fleet to conduct submarine testing and development, to fall into an ice cave.

You should know that after entering the international waters, the formation has dived in depth. In this case, the formation is detected by the enemy sonar, which means that all Chinese submarines will be under the surveillance of the enemy.

This also means that the secret and suddenness of the submarine force relying on for survival have disappeared!

According to the situation on that day, it is very likely that the US has set up the latest generation of active defense network in the international waters outside the South China Sea, realizing a comprehensive monitoring and blockade of the South China Sea waters.

In such a situation, once a war breaks out, the submarines of the entire South China Sea Fleet will be useless. As long as you go abroad, you will be someone else’s target!

The belief that he had been persisting for twenty years collapsed at that moment. Xing Yaxin stayed asleep for more than three weeks and laid himself in the R&D room.

Seeing that his condition was extremely poor, he was in danger of sudden death at any time. The head of the entire Navy Bureau issued a death order and forced him to take him to a transport plane and "transported" back to the capital to visit relatives.

Although the person has returned, Xing Yaxin’s soul is still in the South China Sea.

The three submarines in the formation at the time of the incident were all considered to be the more advanced models among the active submarines. Among them, the underwater noise of the Han-class and powered submarines was only 85 decibels, while the two Kilo-type conventional submarines were conventional submarines powered by diesel-electric power, their noise was around 90 decibels.

At present, the most advanced military sonar detection network in the world, the lowest sound source that can be detected is only 90 decibels. However, it is not impossible to detect it below 90 decibels, but the noise inside the ocean is as high as 90 decibels. As long as the submarine's underwater noise is around 90, it can be mixed in the sea and integrated with the heartbeat of the vast sea.

Therefore, experts in the world have a general consensus that as long as the noise of the submarine is below 90, it has reached the "stealth standard".

After these days of hard thinking, Xing Yaxin inferred that it must be the US inventing a sonar network that can detect and distinguish seawater and submarine noise, and applied it outside the South China Sea gate!

So this man in his forties had nothing in his heart since that day. There was only one thought left - to silence the submarine!

...

Xing Yaxin is at home in Beijing.

Although I haven't been home for a long time, I guess my daughter has come to clean it often, so the room is still neat. On the head of the bed in the bedroom and the yellowed photo, the young Xing Yaxin still smiles so brilliantly.

But Xing Yaxin, who was sitting on the bed, was already full of vicissitudes of life.

Just as he was ecstatic about looking at the photos, his phone rang.

"Report leader, we have investigated the motor data on the Zhengxin BMW 5 Series. The motor model is LS-551, and uses Zhengxin's active noise reduction technology with completely independent property rights. Within the normal power output range, the noise is at least 15 decibels.

Its production location is located at the Zhengxin Industrial Base in the Binhai New District of Tiancheng City. Currently, 7,721 units have been installed, mainly used in three models of 5 Series sedans under Zhengxin’s BMW brand.

According to our investigation, 32 raw materials are required for the production of this motor. Except for the production materials of the core component permanent magnet rotor, the main source of the rare earth mine in Nanfei Republic, the rest of the materials are supplied domestically. These suppliers have..."

The report on the other side of the phone is very detailed, from motor parameters to suppliers of a screw. After ten minutes of the report, all the information of Zhengxin Permanent Magnet Motor has been displayed in Xing Yaxin's heart.

At this time, Xing Yaxin's face dissipated, and a faint smile appeared on the corner of his mouth.

"Help me contact the head of the group, the Zhengxin, and I need to meet him. Immediately, right away!"

Xing Yaxin ordered to the other side of the phone.

"Uh..." The other side of the phone was a little hesitant.

"Is there any difficulty?" Xing Yaxin frowned. Unlike the dullness before, the majesty between words made the people on the other side of the phone feel the pressure from the mountain.

"Report to the leader, the target person is currently in Class A protection. We do not have the authority to find out his specific location."

"Class A protection?" Xing Yaxin hissed. Of course he understood what the meaning of this code name was. As a senior national defense researcher, he himself was in this state for many years.

That means that the target person is no longer in a normal city. Instead, he is in a place that exists in China, but will never be displayed on the map of China.

...

"Ah Yeh!"

In a building where even the sun is owed, Li Fanyu sneezes violently.

"Mom, how many meters is this broken ground?"
Chapter completed!