Changkong Fighter

Chapter 114 Uninvited guest!
Under the illumination of the fire control radar, the RWR of the illuminated target will sound like a DJ. No one will disobey the advice, because the sound of the coming death will be unbearable for even pilots with excellent psychological qualities.

After the aircraft changed course, the Yulin ship no longer used fire control radar to illuminate it, but continued to track it and pay attention to its movements.

"Captain, they haven't left yet." The radar officer reported loudly to the captain of the Nanchang ship.

"Keep tracking!"

The captain said in a cold voice that these extraterritorial forces just like to constantly challenge the bottom line of Dongda, and then feel aggrieved after being beaten by Dongda. Aren’t they despicable!
"Yes!"

After assigning the tasks, the captain looked at another technician and said, "Long March 18, any news?"

"Report, no!"

"Notify the Yulin, Luohe, Wenzhou, and Ma'anshan ships to pay close attention underwater!"

"Yes!"

Surface ships, aerial targets, and even satellites in space are all observable things. When the two sides meet, they have to have a game of "Pleasant Goat and Big Big Wolf", but the real trouble is those things that cannot be seen by the naked eye!

The most dangerous area is underwater!
Boom!
Boom!
At a depth of 200 meters underwater in the western Pacific Ocean, a Blackfish was silently operating in an exercise area near the University of the South China Sea, with its onboard sonar equipment monitoring any movement in the surrounding waters.

No one knew how long this big black fish had been lurking in the area, and no one knew its nationality. After a long period of monitoring, it moved.

The propeller pushed the Big Black Fish at a speed of 6 knots, slowly approaching the exercise area of ​​​​Todai.

The Wenzhou ship's active sonar generator continuously emits sound underwater, and the sonar operator listens to the feedback signals from the underwater sonar, looking for any suspicious sounds.

Above the sea, the anti-submarine helicopters continuously deploy active sonars from the periphery to the sea surface to deter those lurking underwater. The coordinated anti-submarine operations of ships and aircraft pose a huge threat to underwater submarines.

However, these sonar devices are not 100% reliable for submarines.

Active sonar is not conducive to concealment. This submarine of unknown nationality was at 1.5-2 times the effective range of the active sonar of the surface ship formation. The passive sonar detector on the submarine captured the active sonar of the Wenzhou ship, and the big black fish immediately sailed out of the search zone along the tangent direction of the edge of the search zone of the surface ship formation.

As long as the submarine is not at the same depth as the towed linear array variable depth sonar, the lower water area is conducive to submarine concealment.

Then the big black fish dived deeper and entered the acoustic transition layer (the sound shadow area in the sea water), constantly adjusted the angle, used the gradual change of direction method to reduce the submarine's sound wave reflection area, and carefully cut into the inside of the exercise circle, intending to go inside to find out.

When it finally passed through the anti-submarine area formed by several 054B ships on the periphery, its speed increased slightly and it entered the inner circle at a speed of 12 knots. When it passed through a certain sea area silently, it did not know that it had already been targeted by another hunter that had been lurking there longer than it.

Boom!
Boom!
Under the deep sea, a big black fish lurks silently at a depth of 246 meters. According to the navy's naming rules, nuclear submarines are often named "Long March" plus a serial number, and Long March 18 is none other than this new Type 095 attack nuclear submarine of Dongda University.

The Type 095 attack nuclear submarine is equipped with advanced high-temperature gas-cooled nuclear reactors, shaftless pump propulsion, and other cutting-edge nuclear submarine technologies, significantly enhancing its deep-sea combat capabilities. While surface ships are less capable of detecting submarines than their submarine counterparts, submarines can adapt to and exploit the advantages of different water layers and hydrological environments, creating a shared combat environment underwater with the submarine being attacked.

The main task of surface ships is to drive away visible targets. The Long March 18 conducts regional hunting in the exercise area, waiting for these disobedient guys.

20 minutes ago.
The sonar officer with the rank of First Sergeant Major suddenly frowned and made a silent gesture to the officers around him. Almost instantly, all the crew members around him stood still, their breathing slowed down, and their eyes turned to the old squad leader.

The sonar officer tilted his head slightly and listened for a while, then bent over and gently operated the wheels on the console to control the towed sonar array.

Staring at the feedback data, the old squad leader's eyes flickered. He turned back to look at the captain and whispered in a very serious voice: "Report to the captain, the sonar picked up a faint sound, bearing 140, and the echo is unstable!"

The captain's expression turned serious. He immediately picked up the intercom beside him and said in a low voice, "Combat alert!"

Click! The lights inside the submarine turned red, alerting all crew members: The battle has begun!

All the crew members began to prepare quietly to deal with the upcoming battle!
After sounding the battle alarm, the captain looked at the first mate and asked, "Has it spotted us?"

"No!" said the first mate after a moment's thought.

The Long March 18 is now in ambush mode. In this state, the submarine is extremely concealed, and the opponent cannot turn on the active sonar to search for submarines in the surrounding waters. That would be equivalent to telling the 054B on the surface that there are people here!
The captain's best quality is suspicion. After hearing what the first mate said, he fell into deep thought. First of all, the fact that this submarine of unknown nationality could pass through the anti-submarine circle formed by 054B itself shows that it has a certain technical content, and at this depth, it is most likely a nuclear-powered submarine.

There are only a few countries on Earth that possess nuclear-powered submarines. The captain looked at the sonar officer and asked, "Can you confirm which country this submarine is from?"

"No, compared with the database, there is no voiceprint match."

Upon hearing this, the captain pulled out a stopwatch from his pocket, his expression serious. "Yes (got or understood)! Report the water acoustic gradient!"

Technicians quickly operated the sound velocity gradient meter to measure the water sound gradient of the surrounding sea area.

The surface water in the western Pacific Ocean is exposed to sunlight, causing the water temperature to rise significantly, but the water temperature in the lower layer gradually decreases with increasing depth, forming a strong negative gradient layer.

"Captain, the surrounding waters have a very strong negative gradient, and the upper waters have a positive negative positive gradient."

The strong negative gradient layer with a water temperature change of more than 0.2℃/meter has strong refraction, reflection and absorption effects on sound waves, which will greatly reduce the effective range of underwater acoustic detection equipment. In other words, the unidentified submarine may not have discovered the Long March 18, but the Long March 18 discovered the other side and took the initiative.

After determining the surrounding hydrological conditions, the captain gave the order: "Yes! Retract the towed sonar array, tilt bow 3°, and fly at half the maximum low-noise speed."

"Retract the towed sonar array! Trim bow 3°! Half maximum low-noise speed!" the first mate repeated.

Almost instantly, all the crew members became tense. Listening to the captain's order, neither the first mate nor the political commissar objected to the meaning behind it, which shocked them and made them excited at the same time!
(End of this chapter)