Today's sonar system technology is still very primitive, can only rely on human listening to distinguish, not as advanced as the later generations with computer analysis, can not listen to the noise emitted by enemy submarines, completely rely on the hearing of passive sonar listeners, this uncertain line of factors is very large, if the sonar listener is sick or dead, then the ship's ability to listen to underwater submarines will disappear completely, of course, a ship can not have only one sonar listener, in this regard the Chinese fleet is much better than the British Royal Navy fleet.

Gao Qi, director of the sonar system detection room, was shocked when he heard Tang Li's shout, and his body jumped up from the chair like a spring, and then strode behind Tang Li and asked, "Xiao Tang, can you be sure?" ”

Tang Li nodded vigorously and said, "Eighty percent sure!" ”

After all, this was the first time that the fleet had detected an enemy underwater submarine since it was fully equipped with a sonar system two years ago, so Tang Li did not dare to say that he was 100% sure. In the past, when it was in a confrontation with the Japanese Navy, the Japanese Navy only had two submarines, but they were blown up by Chinese bombers in the port of Yokosuka, and Tang Li had no chance to detect the submarines of other countries.

Probably? Eighty percent of the certainty is already great! Gao Qi took the headset and put it on his ear and listened to it for more than ten seconds, then took off the headset and returned it to Tang Li, turned his head and said loudly: "Active sonar get ready, communicator, report the situation to the top immediately, boys, cheer me up, this time is different, now there is an enemy submarine hidden under the sea surface around us more than 6 nautical miles away, the submarine has a great threat to surface ships under the surface, it only needs a torpedo if it hits the target." The target will take a heavy hit, and we must find its exact location before it gets close to our ship and fires torpedoes at our team! ”

All the naval officers in the sonar detection room stood up and said loudly, "Yes. Sir! ”

The news was quickly reported to Shen Shoukun, and after receiving the report from the operational staff officer, Shen Shoukun immediately instructed: "Give an order to the sonar detection room." As soon as possible to find the approximate location of the enemy submarine; Put all four anti-submarine reconnaissance planes on standby, order all cruisers and destroyers to be on full alert, and wait for orders to be ready to encircle and suppress enemy submarines at any time! ”

The combat staff officer stood up and saluted: "Yes, General!" ”

With Shen Shoukun's order, the entire fleet took action, and Rear Admiral Dunst, who was on the flagship as a liaison between the two sides, heard the fleet's early warning, and hurriedly ran from the deck to the command cabin, and when he saw Shen Shoukun, he immediately asked, "Shen, what's wrong?" Why is your fleet so close to the enemy? ”

Shen Shoukun saw that it was Dunst. said indifferently: "Let General Dunst be frightened, it's not a big deal, it's just that we found an enemy submarine hiding in the nearby waters, and we are currently actively looking for this enemy submarine, and after finding its specific location, we will find a way to blow it up, and please don't be impatient."

"What, submarines?" Dunst was horrified when he heard this, but he knew the deterrent power of the submarine thing, when it was hidden beneath the surface and stood still. It is difficult to spot its existence, but in recent times the Germans have begun to practice unrestricted submarine warfare, and there are German submarines hiding in many of the shipping lanes to the British mainland, and so far more than eighty large merchant ships have been sunk by submarines. But he knew that the British had now installed a device called a sonar listening device on several ships, which could detect enemy submarines hidden on the surface within a certain limit and range, but he did not expect that the Chinese military equipment was also equipped with such a device. It must have been equipped with such a device, or something similar to that of the sonar listening device that the British were equipped with.

Dunst could not help but be surprised, because the French naval fleet was not far away. The two fleets sailed side by side, no more than five or six nautical miles apart. If there really are Austro-Hungarian submarines, since the submarines can pose a threat to the Chinese naval expeditionary fleet, they can also pose a threat to the French naval fleet, and the most troublesome thing is that none of the ships in the French naval fleet are equipped with equipment that can detect enemy submarines, and if the Austro-Hungarian submarines suddenly attack the French fleet, then the French naval fleet will inevitably suffer from the ship.

Dunst hurriedly said, "General Shen, are the ships of your fleet equipped with equipment that can detect underwater submarines like those on British warships?" Isn't it? ”

Shen Shoukun said expressionlessly: "General Dunst, I have nothing to say about all military secrets related to my country, forgive me!" ”

"Oh, no, no, General Shen, I don't mean that, I don't want to listen to the military secrets of your fleet, I just want to tell you that your fleet can find the enemy's submarine hidden underwater, but our French fleet can't, now our two fleets are more than five nautical miles apart, if the enemy submarine attacks our ship, we can't find each other at all, we can only be beaten passively, and at such a distance, your fleet can't rescue in time, Please General Shen quickly think of a way to ensure the safety of the ships of our fleet, help! ”

Dunst can't help but be anxious, you must know that this time the French fleet can be said to be the main force, this is the last naval strength of the French, even the loss of one can not be afforded, and now there is only one enemy submarine that has been discovered, you must know that there is definitely more than one submarine in Austria-Hungary, at least more than twenty, if all these submarines come around to attack the French fleet, Dunst can't believe what will happen.

There are several main reasons why cruisers, destroyers, and other ships can become the nemesis of underwater submarines: First, light cruisers and destroyers have small tonnage, small hulls, and high speeds, and even if they are torpedoed by submarines, as long as they can be detected in time, they have a great possibility to evade or directly intercept them with machine guns and machine guns; Second, these small-tonnage ships are safe to have anti-submarine detection equipment, such as sonar systems, passive sonar and active sonar together, as long as the technology is excellent, it is still easy to find the approximate location of the submarine, many ships in later generations are equipped with anti-submarine helicopters to cooperate with the detection of the specific location of the submarine; Third, these light ships have weapons that can cause great damage to submarines, such as deep-water bombings, rapid-fire guns, etc., depth charges can attack enemy submarines hidden underwater, machine guns and rapid-fire guns can cause damage to submarines that surface, and submarines have extremely low defense against bombs and shells, and are easily sunk.

The reason why Dunst was anxious was because the French fleet was not equipped with anti-submarine equipment, and the British had invented depth charges a few months earlier, but they had not sold this technology to the French, so the French ships still had no effective weapons against submarines, which showed that the French fleet could only be beaten passively if besieged by enemy submarines.

The depth charge invented by the British looks like a metal canister filled with explosives, equipped with a water pressure fuse and a trigger fuse, and the depth charge is dropped into the water by a surface ship and explodes once it touches the submarine or reaches a predetermined depth, up to 200 meters. The explosion creates enormous pressure, and submarines within 10 meters of the center of the explosion will be severely damaged.

Shen Shoukun originally wanted to ignore Dunst's request, but after thinking about it, this is not good, if the French fleet suffers heavy losses, the French will definitely negotiate with Shangfeng, which will cause discord in the relationship between the two countries.

After thinking about it, Shen Shoukun said, "General Dunst, since this is the case, I will report the situation to the commander of your fleet, Admiral Alfdere, and order your fleet to move closer to our fleet!" ”

Dunst thought for a moment before agreeing, then immediately turned and walked out of the command module to send a telegram to the flagship of the French fleet.

The current sonar technology is not very advanced, and it is not very easy to find the location of the enemy submarine, only to find an approximate location, and then send light ships and anti-submarine aircraft to detect its specific location.

In order to find the approximate location of the enemy submarine, it is necessary to use a combination of active sonar and passive sonar, which is why Gao Qi, director of the sonar detection room, wants to prepare the active sonar.

Gao Qi shouted: "Is the active sonar ready?" ”

"Ready!" The officer in charge of the active sonar device responded immediately, and the officer in charge of active sonar detection and monitoring was called Wang Ping, and he immediately put on his headphones and got ready.

Gao Qi immediately said: "Okay, immediately turn on the active sonar system and launch sonar!" ”

Active sonar can not be turned on lightly, it is a device used to detect the approximate position of the enemy submarine, once turned on, it means that your position has been exposed, of course, this is in the case of the opponent's submarine has a sonar system, if the other party does not have a sonar system, of course, do not worry about their own exposure.

After a while, Wang Ping shouted: "I heard the echo, the target position is more than five nautical miles, the direction is in the northwest, ten o'clock and ten o'clock direction!" ”

The sonar is emitted in different directions, and the battleship is moving, and it is possible to determine whether there is an echo in that direction, and if there is an echo, it means that there is a problem.

When Gao Qi heard this, he immediately shouted: "Correspondent, report to Shangfeng!" ”

"Yes, sir!"

When it was learned that the enemy submarine had been discovered in the front, the sonar detection rooms of all the ships were working intensively, and the detection results were reported to the above, and after the results were reported, the staff officers of the fleet operations staff room immediately calculated and analyzed the results, found the results that best matched the situation, and then calculated the approximate location of the enemy submarine.

"General, after the sonar detection of each ship and the calculation and analysis of the staff office, it can now be determined that the enemy submarine is probably in this sea area, and the enemy submarine is still moving!"

When Shen Shoukun heard this, he immediately said: "Except for the cruisers and destroyers that are necessary to protect battleships, battle cruisers, aircraft carriers, supply ships, and oil tankers, all other light cruisers and destroyers will be sent out, and they will go all out to surround that sea area at full speed and make every effort to probe and search, and order the anti-submarine reconnaissance fighters on the water to take off immediately and cooperate in the low-altitude search."

On the sea surface during the day, if the submarine does not dive very deeply, you can see a huge black shadow under the water from the air with the naked eye, and this is how the water anti-submarine reconnaissance fighters search for enemy submarines, of course, if the submarine dives very deep, the water anti-submarine reconnaissance fighters will not be able to search for it. (To be continued......)