.After the cursor indicating "North Carolina" disappeared from the sonar display, Zhou Yusheng first asked Lu Chengfeng to discharge part of the sea water in the water tank and let the "Shark" leave the seabed. Then he gave Xia Hongyu an order to inject sea water into the No. 1 and No. 6 torpedo launch tubes.

It is a relatively troublesome process to let the submarine float from the sinking state.

Because the seabed has adsorption force, the weight of the submarine must be lower than the displacement before leaving the seabed, offsetting the adsorption force of the seabed. After completely leaving the seabed, the dynamic balance must be restored to make the weight equal to the displacement, otherwise the submarine will continue to float. The entire process lasted about two minutes, and very obvious noise was generated.

Fortunately, the North Carolina and the dragged sonar were behind the mountain, and the noise from the Shark could not be heard.

As for filling water into the torpedo launcher, it will also produce noise, but it is not very obvious in comparison.

Injecting water into the torpedo launcher in advance is mainly to shorten the attack preparation time and improve the concealment of the attack. Now you only need to input target information for torpedo No. 1 and No. 6, and then open the front cover of the torpedo launcher to launch the torpedo. The entire process will not exceed half a minute, nor will there be any obvious noise.

Because the distance was widened, Zhou Yusheng set the speed of the "Shark" to twelve knots.

As long as the North Carolina has not adjusted its route and still sails around the Troy Peak, half an hour later, the Shark will catch up with the North Carolina on the north side of the mountain, shortening the distance to the ideal distance for attacks with heavy anti-submarine torpedoes: fifteen nautical miles.

At this distance, the Shark can launch attacks in two different ways with two torpedoes.

Generally speaking, Zhou Yusheng will first launch a heavy anti-submarine torpedo that is searched by self-guided, and set the unlocking distance of the torpedo seeker to ten nautical miles, that is, let the torpedo activate the active sonar on the battle thunder head when it is five nautical miles away from the North Carolina to search and complete the attack by itself. After entering the self-attack stage, the speed of the torpedo will be increased from forty knots to fifty-five knots, while the maximum speed of the North Carolina is only thirty-four knots, so within 17 minutes, the torpedo can catch up with the submarine.

The second torpedo, Zhou Yusheng, will choose the line-guided attack mode, and will be launched five to ten minutes late. After the torpedo is out of the tube, it will sail at a speed of fifty-five knots under the guidance of the submarine. It will not cut off the conductor and the torpedo will launch the attack on its own until it is less than five nautical miles away from the North Carolina, or even closer.

According to this tactic, the two torpedoes enter the self-attack stage almost at the same time.

According to the hit rate of one torpedo is 70%, and the comprehensive hit rate of two torpedoes is as high as 91%. As long as you are hit by a torpedo, the North Carolina will undoubtedly die.

Unfortunately, this is just a tactical idea under ideal circumstances.

Zhou Yusheng did not intend to take the initiative to attack the North Carolina. He just wanted to bring more than 100 officers and soldiers on the Shark and those special forces and agents who caused trouble to return to Yulin Port safely. If you are lucky, you might also get a medal and a not-too-short holiday.

Is it necessary to provoke the Americans?

If the Americans really get angry, even if the Shark can escape this disaster, it will not go far.

The Arabian Sea is thousands of nautical miles away from the northern waters of the South China Sea controlled by the Chinese Navy. In the middle, you have to pass through the Sunda Strait and the southern waters of the South China Sea under the control of the US military.

Besides, the US anti-submarine patrol aircraft is coming. I am afraid that the torpedo launched by the Shark will hit North Carolina before the US airdrop anti-submarine torpedo hits.

After being exposed, the Shark was unable to take any advantage in front of the anti-submarine patrol aircraft.

Not long after, Zhou Yusheng's worries became a fact.

The spherical attack sonar installed at the head of the Shark boat just received the noise from the North Carolina pump jet thruster, and Meng Guangyang issued an alarm.

Hearing the low buzzing sound, Zhou Yusheng and others' expressions changed suddenly.

"Anti-submarine patrol aircraft." Yang Yuanfan said to Li Xiaoming, "p-3c, right above our heads, this sound is so familiar."

"You often encounter this kind of plane?"

Before Yang Yuanfan could speak, Zhou Yusheng pressed his hands down to keep everyone quiet.

"It's not often encountered, but Japan and Taiwan have such aircraft. As long as our submarines go to sea, there will definitely be P-3c nearby." Yang Yuanfan lowered his voice and said, "It's better not to provoke them, let alone be discovered by them, otherwise we will be done."

Zhou Yusheng glared at the deputy captain who was talking a little too much before looking at Meng Guangyang.

"Three signal sources are moving away."

"Is there any sound of water entering?"

"No, the height of the signal source is more than one thousand meters, exceeding the maximum height of the thrown sonar and torpedo."

After hearing this, Zhou Yusheng breathed a sigh of relief.

Yang Yuanfan also breathed a sigh of relief, and at the same time smiled at Mu Haoyang and Li Xiaoming.

"What's going on?" Mu Haoyang was a little confused.

"The US anti-submarine patrol plane did not find us, or did not expect that we were still here." After relaxing, Yang Yuanfan said more. "If the US military knew that we were still here, it would definitely lower the flight altitude, drop the sonar buoy, and then kill us with anti-submarine torpedoes. Now they are flying eastward, probably thinking that we are sailing eastward and will start searching dozens of nautical miles eastward."

"The North Carolina did not send the message to the anti-submarine patrol plane?"

"How to send it?" Yang Yuanfan glanced at Mu Haoyang and said, "The only thing that can be used in the submarine is underwater, especially in the deep sea, is sonar. If you want to contact the outside world, you either use sonar buoys like we did before, or use drag-and-drop communication antennas."

“Why not do this?”

"There is no need for this." After the danger, Zhou Yusheng was no longer so serious. "The captain of the US military must be very confident and thinks we cannot find the 'North Carolina'. Imagine that if we don't know that the US submarine is nearby, after the anti-submarine patrol aircraft passes, we will leave the sinking site, go south, or other directions, leaving this sea area, and then there will be very obvious noise."

"The 'North Carolina' can catch this opportunity and kill us." Yang Yuanfan snatched the captain's words.

Zhou Yusheng smiled, not angry for Yang Yuanfan's stolen his limelight. "Fortunately, we not only discovered the 'North Carolina', but also followed it. It won't take long before the US captain would doubt his speculation, believing that we had already gone away, and then increase the speed to chase eastward."

"We can take this opportunity to leave?"

"Or continue to follow the butt of the North Carolina to shorten the return time." Li Xiaoming glanced at Zhou Yusheng and said, "After increasing the speed, the North Carolina will definitely have to withdraw the drag sonar and completely lose its perception of the rear. Although the noise intensity of the Shark is greater than that of the North Carolina, as long as you stay behind the North Carolina, you will not be discovered by the US military. Go to the west of the Octave Strait, and then leave the North Carolina and head from south of Sri Lanka to the Sunda Strait."

"It's too dangerous to do this." Yang Yuanfan immediately raised his objection.

"The greater the danger, the greater the opportunity." Li Xiaoming smiled and said, "Although I don't know much about submarine tactics, I know that the Americans will not let it go. If we didn't find us in the Arabian Sea, the Americans will only do two things, one is to give up tracking, and the other is to block our way home. If it were the former, everyone would naturally be happy. If it were the latter, we would have to prepare for the future."

"How to prepare for it?"

Li Xiaoming glanced at Yang Yuanfan and said, "Unless we plan to bypass Australia, or go to the South Atlantic Ocean, go from Cape Horn to South America, and then cross the Pacific Ocean, we have to return to the South China Sea before the Americans blocked the Strait of Malacca, the Sunda Strait and the Longmu Strait."

"But……"

Zhou Yusheng pressed his hands down, asked Yang Yuanfan to stand aside, and said to Li Xiaoming: "You are right, but before that we have to bite the 'North Carolina'."

At this moment, Meng Guangyang issued an alarm again.

"What's going on?"

"The target began to slow down and left the orbiting channel."

Zhou Yusheng was shocked and immediately said to Lu Chengfeng: "Adjust the course and speed, and follow the 'North Carolina'."

The sudden slowdown of the US submarine was really shocked by the officers and soldiers in the command cabin. Even Li Xiaoming realized that the crisis had not passed yet.

Ramons was not stupid, but was trying to seize the opportunity.

After hearing the p-3c flying overhead, Ramons immediately thought that the "unidentified" submarine would immediately leave the Troy underwater peak and avoid it south. The reason is very simple. If the p-3c does not harvest in the east, it will definitely go back to search for the waters near the Troy underwater peak and then expand the search range south. If you cannot try to stay away from the Troy underwater peak as far as possible before the anti-submarine patrol aircraft returns, the chance of being found is very high.

At this time, the North Carolina was still north of the Troy Underwater Peak.

Because the dragging sonar and side-side sonar arrays are the most ideal detection effect on both sides of the submarine, there are blind spots in front and behind the submarine, Ramons did not allow the North Carolina to speed up around the Troy seaside peaks, but sailed straight west.

In this way, the port side of the North Carolina is facing the south.

To slow down the submarine, the main purpose is to reduce the interference caused by spoiler to drag the sonar and the side sonar array, and to increase the detection distance between the two passive sonars.

Ramons did right, but he never expected that the "unidentified" submarine was behind his butt, in the blind spot of the sonar detection of the "North Carolina".

Leaving the Troy Undersea Peak, the North Carolina was completely exposed to the gun of the Shark.
Chapter completed!