.It is indeed a "Sun Yuanyi" class. After comparing the noise characteristics, it is confirmed that it is the second ship of this class and the first ship built by Hyundai Heavy Industry, the "Zhengdi".

Although South Korea's manufacturing industry is very developed, Hyundai Motor sells to hundreds of countries and has strong shipbuilding strength, South Korea is still much worse than Germany in the field of cutting-edge precision manufacturing. The assembly standards of the "Zhengdi" and especially the mounting strength of the sound-silencing tiles are obviously not as good as those of the "Sun Yuanyi".

Shortly after the "Zhengdi" was in service, it was reported that the sound-silence tiles were not strong enough to fall off on a large scale during the voyage.

Strictly speaking, this is not the reason for Hyundai Heavy Industry.

Because the 214th level was originally the AIP version of the 209th level, and when the 209th level was designed, the sound silence tiles were not yet applied to conventional submarines. The 209th level of the South Korean Navy, namely the "Zhang Baogao" class, added sound silence tiles during the mid-term improvement, also encountered the same problem.

The problem of the "Sun Yuanyi" class is not very prominent, mainly because Germany has adopted more advanced assembly technology. Because the construction cost has exceeded the cost and has encountered a global financial crisis that has been rare in a century, the South Korean Navy did not spend money to allow Hyundai Heavy Industry to introduce technology from Germany, but instead allowed Hyundai Heavy Industry to develop it on its own and make improvements when eight self-built submarines such as the "Zhengdi" are undergoing mid-term overhaul.

The sound-silenced tiles fall off have a very serious impact on the concealment of the submarine.

When the distance is closer, not only can the side sonar be detected, but even the attack sonar on the bow can detect the noise emitted by the "Zhengdi".

Wang Yuhan did not miss the opportunity, so he put the "Zhengdi" in front and followed quietly.

"What should I do now?" Mu Haoyang was a little anxious because another hour had passed.

"It may be a bit slow to follow the 'Zhengdi', but it will definitely take you to your destination." Wang Yuhan was not anxious at all, and the captain of the submarine was not impatient.

"But……"

"The Zhengdi must have discovered us, knowing that we have crossed the Yellow Sea midline, otherwise we would not have accelerated to follow up." Wang Yuhan smiled and said, "Although the Zhengdi doesn't know what we are going to do, it will sail eastward until we find us. It is only a few dozen nautical miles away from the west coast of South Korea. When the Zhengdi finds and loses us, it will not be far from South Korea."

“Can you guarantee it won’t turn?”

"At least there is no turning now. Even if we turn later, we can stop and wait until it goes far before speeding up to our destination."

"Can't you be faster?"

Wang Yuhan nodded and said, "I have tried my best and my luck is pretty good. If it were the 'Sun Yuanyi', we are still sailing south."

Mu Haoyang sighed and said nothing more.

At this time, the electronic officer came over. Because the "Sea Snake" had only thirty-three officers and soldiers, five of them, there were no communication officers, and the electronic officer was responsible for the communication work.

"I just received the order issued by the Volunteer Army Command."

"What does it have to do with us?" Wang Yuhan frowned and received the message handed over by the electronic officer.

"There is an electronic signature of the Chief of Staff on it, and it is very clear that we participated in the war as the Korean People's Army when we received the order."

Joining the war! Mu Haoyang was shocked and glanced at the telegram.

There is indeed an electronic signature from Chief of Staff Lu Fenglie, and the content is clear.

"Damn it!" Wang Yuhan cursed in a low voice, "Issuing combat orders, all officers and soldiers enter the combat post and check the fire control system and torpedo."

The order was conveyed immediately, and a red light lit up in the command cabin.

Half an hour ago, North Korea's Supreme Commander Park Joon-chul issued a stern-worded diplomatic statement in Pyongyang.

Park Jun-cheol changed his bad habits of diplomats and made it clear in just five minutes: North Korea will use all means to implement the inalienable right of self-defense of sovereign states, and the People's Army will use the most ruthless means to attack the invaders on various battlefields such as land, sea, air, and behind enemy lines.

Huang Zhibo was very patient and called Xu Fentao after watching the TV news.

Because the Volunteer Army is not a regular army and cannot use certain strategic facilities of the Chinese army, such as the land-based ultra-long-wave radio station that specializes in communication with submarines, Huang Zhibo asked Liao Wengang to paint a specially improved Y-8 with the logo of the People's Army and temporarily use it by the Volunteer Army.

This transport aircraft has only one purpose: communication with submarines.

Because the wavelength of the radio wave is proportional to the size of the transmitting antenna, land-level ultra-long-wave radio stations often use civilian power transmission lines as the transmitting antenna.

It is obviously not realistic to move such a huge antenna to the sky.

The solution is: tow a cable of several kilometers or even ten kilometers long on a modified platform, as a transmitting antenna for the radio.

Because the people participating in the war were all conventional submarines, all in the Yellow Sea, with a diving depth of only a few dozen meters, so the antenna does not need to be too long, five kilometers is enough, and it can be towed by y-8.

The telegram received by the "Sea Snake" was exactly what this plane sent.

Seven other conventional submarines operating in the Yellow Sea also received orders.

Sending the order does not mean that everything is fine.

Huang Zhibo arranged a task for Xu Fantao: to take the military officers from the North Korean Embassy to Shinyiju, form the Volunteer Navy Command, and take the lead in cooperation with the People's Army.

According to Huang Zhibo's arrangement, all submarines participating in the attack will go to the North Korean port and painted with the People's Army logo.

After Xu Fantao went to North Korea, he had to do one thing well: do ideological work for submarine officers and soldiers, and let them temporarily participate in the war as the People's Army.

Huang Zhibo's purpose is very clear. If it happens, such as the submarine officers and soldiers being captured by the US-South Korea Allied Forces, they have nothing to do with China, but also with the Volunteer Army.

It was this arrangement that made Wang Yuhan dissatisfied.

The message clearly mentioned that all submarines that received the order will be incorporated into the Korean People's Army.

It’s okay to be incorporated into the Volunteer Army. Anyway, everyone knows that the Volunteer Army is a Chinese army with a different name. It suddenly becomes the Korean People’s Army, and no one can understand it.

If you are not a North Korean, why should you be a North Korean soldier?

Wang Yuhan thought more realistically: Who should I ask for rewards? If I unfortunately die, would it be considered as the death of Wei Kingdom or the martyrdom of North Korea?

He was unshirkable to sacrifice his life for the country, but Wang Yuhan did not have such a high awareness of martyrdom for North Korea.

Wang Yuhan is not the only one who can't figure it out. It can be said that few submarine soldiers can understand it, and those Korean submarine soldiers may not be able to figure it out.

If you can’t figure it out, the order cannot be questioned.

The duty of a soldier is to obey orders.

The "Zhengdi" is right in front. Since the "Sea Snake" has become a submarine of the Korean People's Army, there is naturally reason to take the initiative to attack the South Korean submarine.

In less than two minutes, the "Sea Snake" completed its attack preparations.

Because it's too close, there's no need to use attack sonar.

"Old Wang..." Jiang Xinwei reminded Wang Yuhan, who was a little distracted.

"Target information." Wang Yuhan breathed a long sigh and calmed down.

"The distance is fifteen chains, the course is one-zero, the speed is eight, and the depth is thirty-five."

"No. 1, No. 2, No. 5, No. 6 torpedo installed fire control data, No. 1 and No. 6 torpedo launch tubes are injected, and ready to open the front cover."

"The fire control data has been installed and the torpedo launcher has been injected with water."

Wang Yuhan looked back at Mu Haoyang, as if he wanted Mu Haoyang to make a decision.

"Old Wang, no matter what you think, we have to race against time." Mu Haoyang knew that Wang Yuhan was a little hesitant, "The two pilots shot down the US F-22a and fired the first shot to fight aid Korea. Now they are in danger. Every second they delay, the hope of saving them is one point less."

Wang Yuhan breathed a sigh, nodded, and said, "I believe you will definitely save them."

Mu Haoyang smiled and said nothing.

Wang Yuhan did not hesitate anymore and turned around and said to the weapon officer: "Open the front cover of the launch tube."

“The front cover is open.”

"Full-speed self-guiding, unlocking ten chains of distance."

The weapon officer quickly set the torpedo attack mode and nodded to Wang Yuhan.

"Starting No. 1."

"Flame No. 1!" The weapon officer said loudly.

However, the noise generated during torpedo launch is even more obvious, and even Mu Haoyang can hear it.

After waiting for a few seconds, Wang Yuhan issued another fire order. "Start No. 2."

"Start No. 2!"

When the second torpedo was pushed out by high-pressure air, the submarine vibrated significantly several times.

After more than ten seconds, two heavy anti-submarine torpedoes reached a maximum speed of 55 knots, and rushed towards the "Zhengdi" which was more than ten chains away.

The noise from the torpedo is very loud and cannot be concealed at all.

"The enemy boat is accelerating to the left...the enemy boat has discovered the torpedo."

Hearing the electronic officer's words, Wang Yuhan just nodded.

Ten chains are equal to one nautical mile, and the torpedo sails at a speed of fifty-five knots. After more than forty seconds, the active sonar seeker will be activated and the target will be searched.

The "Zhengdi" can run up to twenty knots, and its acceleration performance is not excellent. When the torpedo enters the self-guided stage, it can sail at most half a nautical mile. At this time, the distance between the torpedo and the submarine is less than one nautical mile, while the working distance of the torpedo active sonar seeker is more than five nautical miles.

"Old Wang..."

"Nothing needs to be done, just wait patiently."

Mu Haoyang knew how much he had, so he didn't ask any more questions.

The Zhengdi did find the torpedo attacking from behind and immediately avoided it. Unfortunately, the conventional submarine is a conventional submarine. Although it immediately turns left and accelerates, the water depth here is only about 60 meters. The Zhengdi's submarine depth is 35 meters, and the keel is less than 30 meters below the sea floor. In such a narrow space, the submarine cannot escape the torpedo's attack range.

Wang Yuhan breathed a sigh of relief when he heard the sonar slap reflected from the "Zhengdi".

Both torpedoes have locked in and are approaching the target.

The time left for the "Zhengdi" starts to be calculated in seconds. What the "Zhengdi" can do is to release noise interference bombs and torpedo bait at the last moment.

But the water depth is too shallow.

The interference bomb will fall on the seabed before creating a bubble curtain wall, making the bubbles unable to dissipate and cannot create a large enough bubble curtain wall. The bait cannot direct the torpedo to the deep sea, so it can only allow the torpedo to take some time to search for the attack target again and then launch an attack again.

Wang Yuhan doesn't want to fight with a Korean submarine. It's not that he doesn't have the courage, but that this kind of battle is like two fast gunmen duels in a narrow room, comparing who takes action faster.
Chapter completed!