Because of several trips in this thrilling canyon, Chinese submariners have accumulated a wealth of experience.

Under the command of Jiang Haitao and others, the No. 031 submarine came to the south-central Pacific Ocean very smoothly, and then went straight to the southwestern destination -- the South China Sea -- to insert it.

To the surprise of Jiang Haitao and others, the day after arriving near the Nansha Islands in the South China Sea, the sonar room of the No. 031 submarine, which was searching for an Indian nuclear submarine, sent an exciting message to the control tower: "An unknown submarine has been discovered, with an azimuth of 94 degrees, and the other numbers are unknown. ”

Jiang Haitao glanced at the computer screen and said to the staff officer who recorded the order: "Order: The depth remains the same, the course is one hundred and eighty-two degrees, and the speed is four knots!" Passive sonar pays attention to collecting information about the target! ”

After the staff officer quickly entered the command into the computer, Jiang Haitao quickly looked at the screen and calmly pressed the command confirmation button, and the submarine began to slowly slow down from the speed of eight knots, the vibration of the submarine was already slight, but now the vibration is even smaller, almost imperceptible, and the water in the cup does not move.

Keeping the submarine quiet is to make the sonar better detectable and not let its own noise interfere.

Half an hour later, the sonar room sent the latest confirmation message: "The unknown submarine is a ballistic missile nuclear submarine with an azimuth of 92 degrees, a course of 315 degrees, a speed of 18 knots, a depth of 95 meters, a distance of about 54 nautical miles, and an error of plus or minus 3.5 nautical miles. ”

Since the installation of the new sonar system and the use of a new noise reduction digital model, the detection accuracy of the passive sonar of the Project 031 submarine has been greatly improved.

The so-called identity verification of the submarine is to compare its voiceprint and outline with the stored data to see if there is any identical or similar information that matches it. Of course, this is all done automatically by the computer and vague conclusions, and the final determination still needs to be carried out by experienced seafarers. A ballistic missile nuclear submarine is a nuclear submarine capable of launching long-range ballistic missiles. Some also call it a strategic nuclear submarine in terms of its role in warfare.

A flickering yellow dot appeared on the display screen in front of Jiang Haitao and the others that showed the peripheral situation.

The officers and men on board all knew that the yellow number represented jù had not yet been confirmed.

Jiang Haitao ordered: "The direction remains the same, dive to one hundred and twenty meters, and the speed is two knots." ”

At this time, another message came from the sonar room: "Another unidentified large submarine has been discovered, with an azimuth of 342 degrees, and other numbers are being measured." ”

Ma Yanshu whispered: "I cǎo his mother's, either I don't come, why are there two guys?" Which one is Indian? ”

Jiang Haitao glanced at the display screen and saw that a red flash point had been added to the screen showing the periphery, indicating that the passive sonar system had not confirmed the number of measurements for this target.

He turned his head and glanced at Ma Yanshu. The two of them invariably pointed to the bottom of the ocean on the screen below, and then smiled knowingly.

Jiang Haitao immediately ordered: "The course is one hundred and sixty degrees, and the speed is two knots!" ”

After a few minutes, Jiang Haitao ordered again: "The drive motor is shut down, and the submarine sits at the bottom." Passive sonar continues to monitor the two incoming ships. ”

For a few days, they had come to trust and love the newly installed active sonar system, and they wouldn't have dared to hide here without the fact that the current active sonar clearly shows the terrain here.

Not long after the submarine sat at the bottom, another message came from the sonar room: "The second unknown submarine is also a ballistic missile nuclear submarine, with a bearing of 351 degrees, a course of 121 degrees, and a speed of 22 knots. The depth is 120 meters, the distance is about 48 nautical miles, and the error is plus or minus 6 nautical miles. ”

Seeing that it was another nuclear submarine, the deputy captain couldn't help but whisper: "Why are both big guys?" Are they here to party? ”

Jiang Haitao asked the sonar detection technology expert who accompanied the boat: "Why is it late to find out if the distance is close?" ”

The technologist looks bullish. He replied, "What's so strange about it, the noise level is different." ”

Jiang Haitao smiled self-deprecatingly: "Hehe, I'm confused." ”

The technical expert said solemnly: "Judging from the excellent performance of the latter one, it is likely to be a strategic nuclear submarine of the United States." ”

Jiang Haitao nodded. Turning his head to the combat staff officer, he said, "Immediately draw their next trajectory according to the current numbers, and look for the minimum possible intersection between the two!" ”

The operational staff officer hurriedly operated his computer. After pressing a button, he quickly said: "According to their respective directions and speeds, it is expected that the two nuclear submarines will stagger at a point of fifteen degrees in azimuth and eleven nautical miles from us, when they are only two nautical miles apart from each other." ”

Jiang Haitao, Ma Yanshu and the others and the technical expert all silently watched the two bright spots slowly approach, and these two points formed a triangle with the location of their submarine, one on the left of their submarine and the other on the right of their submarine.

Judging from the distance between the Type 031 submarine and them, as well as the distance between them, it can be seen that the effective detection distance of the new sonar system is definitely farther than that of the sonar system installed on the two nuclear submarines.

Because the distance between them is now about fifty nautical miles, which is close to or even less than the distance at which 031 spotted them, but they have not yet found any signs of each other, and their speed and course have remained the same.

However, the new system is not as good as the technical experts boast, saying that passive sonar has an effective detection distance of 75 nautical miles. When the two points were about forty-five nautical miles apart, the second submarine, coming from the north, slowed down to eighteen knots, but kept its course.

When the distance between the two was less than forty-two nautical miles, the first submarine, the submarine coming from the east, also reduced its forward speed, from the original eighteen knots to the current fifteen knots. Like the nuclear submarine to the north, its course has not changed.

Judging from the table of the two submarines, the performance of the nuclear submarine from the north is obviously better than that of the nuclear submarine from the east, at least it was the first to discover the other party, and the noise is not as loud as the nuclear submarine from the east. But now the two nuclear submarines are unable to confirm the specific location of the other party, only knowing that there is such an opponent, and they both reduce their speed in order to better analyze the opponent's position.

When Jiang Haitao and others observed the movement of the two nuclear submarines, the intelligence staff officers in the sonar room recorded the voiceprints of the two nuclear submarines, analyzed the relevant information they had and checked it with the stored data.

Ten minutes later, the intelligence staff officer in the sonar room sent a message to Jiang Haitao and them: "None of the two strategic nuclear submarines have original records in our database, and our submarines have not encountered them. From the analysis of noise, appearance and other data, the nuclear submarine coming from the north may be the Ohio-class nuclear submarine of the United States. It is impossible to analyze the nuclear submarine from the east, but the noise from the internal nuclear reactor vapor chamber is similar to that of the French nuclear submarine, and the noise of the propeller is similar to that of the British propeller. ”

The judgment of the sonar room is similar to that of Jiang Haitao and the technical experts.

The deputy captain used the computer to send a message to Ma Yanshu: "This Indian nuclear submarine is really a monster, it is simply our Chinese four-like animal." Do you think it's really it? ”

Ma Yanshu shrugged his shoulders, tapped his fingers into the text, and said, "Maybe." But then we were lucky enough to find it so quickly. ”

At this time, the information of the sonar room was displayed on the screen again: "The speed of the A nuclear submarine in the north has dropped to ten knots, the noise is very small, and it is currently rapidly diving to a depth of one hundred and fifty meters, and its course has not changed, one hundred and twenty-one degrees." To the east, submarine B dropped to eight knots, dived to one hundred and thirty meters, and headed three hundred and fifty-one degrees. ”

They have already marked the two nuclear submarines with code names on their computers. The A represents the Ohio-class nuclear submarine coming from the north, possibly from the United States. The other ship of unknown nationality was marked B.

Jiang Haitao had to admire the boldness and carefulness of the US nuclear submarine commander, who could dive to a depth of 150 meters and sneak at a speed of 10 knots in such a complicated sea area. You must know that the terrain here in the South China Sea is very complicated, the deep places are six or seven hundred meters deep, and the shallow places are only a few tens of meters. Now the 031 submarine is sitting at the bottom, and its depth is only 170 meters deep, and there are many boulders or submarine seamounts around the bottom of the 031 submarine.

The Ohio-class nuclear submarine behemoth, which could crash into the rocks of the sea at the slightest mistake, was now able to move at a speed of ten knots, which was extremely bold.

It can also be seen that they are very familiar with the terrain in this area and have enough confidence to ensure the safety of the submarine. At the same time, this situation also shows that the US Navy has done a great deal of meticulous work in the oceans of the world in order to maintain its superiority in the navies of other countries, and they have clearly explored the seabed hydrological conditions in many sea areas, so that they can now sail as if they were at home, and they can sail boldly and quickly in the dark.

On the other hand, the submarine of unknown nationality was much inferior, not only was it noisy, but the commander did not dare to dive too deep, and his actions were much more cautious.

As can be seen from the cautious movements of the two strategic nuclear submarines, they seem to have met by chance and did not understand each other.

However, Jiang Haitao always felt that the two submarines seemed to be not so friendly, as if they were full of hostility, and couldn't help but think in his heart: "What are they going to do?" ”

Seeing that the two submarines will not meet for a while and a half, Jiang Haitao used the computer to check the relevant information of the Ohio-class strategic nuclear submarine of the United States: The "Ohio" class nuclear submarine, which began to be built in 1976, is a behemoth with combat and reconnaissance performance, it is 170.7 meters long, 12.8 meters wide, and has a full load displacement of up to 18,750 tons, and uses the S8G reactor with a thrust of 60,000 shaft horsepower and the introduction of natural circulation technology to greatly reduce noise, and the ballistic missile carrying capacity is as many as 24......

In fact, Jiang Haitao has memorized these materials by heart, and he can recite them when he opens his mouth, but while there is still time, he still needs to judge the intentions of these two nuclear submarines, so he can't help but look at it.

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