The American SSN588 "Villain" attack nuclear submarine did not feel the slightest danger in sight. In the sea area where NH201 is lurking, it constantly uses the SQS4 active sonar base array located at the upper end of the torpedo tube to send pulsed ultrasonic waves to the sea area to detect whether there are hidden submarines around it that may pose a threat to the most "enterprise" aircraft carrier fleet. The echoes they received from the reflection of the target in the water showed that it was just an undulating mountain on the bottom of the sea. The AN/BQR-2B passive sonar base array under the "evil guy" is also quietly and fully receiving all the radiated noise in the surrounding sea and the signals emitted by underwater acoustic equipment.

According to the report of the sonar room, the deputy captain on duty, Major Finaklin, came to the conclusion that "the underwater safety of this sea area." So he followed the chart orders given to him by Lieutenant Colonel Ivida with red, red, green, and green lines and arrows. Keep searching.

To the surprise of Major Finaklin, between the cols of a C-shaped seabed they had just searched, there was a conventionally powered diesel submarine of the Chinese Navy's underwater killer "Dolphin" class, known as the "black hole under the sea".

Listening to the US nuclear submarine rumbling past him, Lieutenant Commander Zhao Hailong, the captain of the NH201 submarine, reacted first that this was the best chance to destroy the US nuclear submarine. He subconsciously swallowed his saliva, forcibly suppressing his urge to fire.

Because the "NH201" submarine received an order from Commander Wang Wei of the "MZD" aircraft carrier fleet before diving, with the "MZD" nuclear-powered aircraft carrier as the center, it could track the US "Enterprise" aircraft carrier fleet at a distance of 300 kilometers; A combat order to open fire without prior warning for any US warship and military aircraft that enters within a 300-kilometer warning circle. The current position is outside the 300-kilometer defense circle of the aircraft carrier "MZD", so he can break the order and order to open fire without authorization until the last resort.

He ordered the submarine "NH201" to dive 350 meters, turn off the engine, turn on the noise detector and water temperature detector in the col with complex ocean currents between the two mounds, and let the submarine enter a silent and stealthy state.

Sound does not propagate in a straight line in water, the leap layer can keep the propagation of sound above or below a specific level, the working environment of sonar is a sea of dynamic changes of physical and chemical characteristics, and the special surnames of sound wave propagation can change with time and place. Everywhere the sea is, it is icy below 250 meters. Due to the difference in the temperature of the upper and lower seawaters. The sound waves will undergo complex and tortuous changes, and even the most advanced sonar cannot determine the exact position of the submarine. Especially in such complex sea conditions, it is even more impossible to detect the "Dolphin" class submarines equipped with silencing tiles.

When the "evil man" left, Lieutenant Colonel Zhao Hailong ordered the submarine "NH201": "Lock on to this US nuclear submarine, use electric navigation, track the US target submarine, and fire only when it enters the edge of the defense circle." ”

Zhao Hailong clicked the mouse, switched the computer page on the display and control console in the command room, and the screen showed the noise value curve left by the US nuclear submarine, the highest value is 138 decibels, such a submarine mute effect is not possible with China's "Dolphin" class submarine PK, it is impossible for this level of noisy submarine to run, and the huge noise will expose its every move. There is simply no way to get rid of the tracking of the "dolphin" on its own. Not to mention the use of the "Seawolf" anti-submarine missile, it is the use of the "Blue Sky 60486 microprocessor" guidance system, which can be guided by various methods such as wire guidance, active and passive sound guidance, or wake homing.

He glanced at the number charts on another computer screen on the display console, and the constantly beating numbers provided the actual distance and position of the "NH201" submarine and the US nuclear submarine, which was now 5 kilometers away from the 300-kilometer defense circle of the "MZD" nuclear-powered aircraft carrier.

Captain Zhao Hailong issued the order to "prepare for torpedo firing in 5 minutes" through the multifunctional "Vanguard" digital combat intelligence command system equipped with the "Dolphin" submarine.

The loudspeaker on the launch platform of the torpedo compartment of the "NH201" submarine transmitted the order of "5 minutes to prepare for torpedo launch" issued by Captain Zhao Hailong, and then the electronic clock on the launch pad entered the launch countdown.

The computer screen on the launch platform shows the launch parameters quickly calculated by the marine environment sensor and electronic command and control system, which integrates the radar system, fire control system, and automatic identification of friend or foe equipped on the submarine, and the automatic launch control provided by the submarine based on the information already known about the target of the US nuclear submarine, as well as the automatic launch control provided, the following tactical movements, and the method of weapon delivery.

The torpedo launch compartment of the submarine "NH201" entered into intense pre-launch preparations

"The launch chief of the torpedo compartment reports that the torpedo is ready for launch"

"Lift the insurance" Zhao Hailong gave the last order before launching.

The launch chief of the torpedo compartment inserted the key hanging around his neck into the keyhole at the upper end of the launch button, opening the safety of the launch button. He placed his right middle finger on the flashing green launch button, and then stared intently at the beating electronic clock above the launch platform 1098710 launch!

At the same time as the number of the electronic clock jumped by 0, the wrestler standing in front of the torpedo launch pad of the submarine "NH201" pressed the launch button. One Y-A 533-mm heavy torpedo, roaring out of the 533-mm torpedo tube on the bow of the "Dolphin" submarine like a dragon entering the water, with a snow-white bubble, like a sharp arrow drawing a white line in the dark seawater, chased 10 kilometers in front of him at a speed of 18 knots per hour to search for the "evil man".

Zhao Hailong did not bear the attack effect of the Y-A 533-mm heavy torpedo in the slightest, and he knew that in nine minutes, the US nuclear submarine would definitely die. He had absolute confidence and certainty in the Y-A 533-mm heavy torpedo.

Zhao Hailong was a cadet of the first batch of submarine academies in New China, he joined the army from Tianjin Nankai Middle School in 1949, served as a cultural instructor of the 343rd Regiment Communication Company of the 115th Division of the 39th Army, won the second class merit in the battle of Yunsan in North Korea in 1950, and was selected to be sent to the Communication College of the Chinese People's Liberation Army after returning to China in 1951. The following year, he was transferred to the Submarine Academy of the Chinese People's Liberation Army Navy. After graduating in 1954, he was assigned to the submarine brigade of the Taiwan W team of the South China Sea Fleet of the People's Liberation Army, and in 1959, as a trainee captain, he participated in the Battle of the Bay of Bengal in the Sino-Indian War, in which he trained the Chinese Navy's Indian Ocean Fleet "Dolphin" class Q001 submarine used "Seawolf" missiles to sink the Indian Navy's "Vikrant" aircraft carrier.

Although at that time he was only a "cadet" captain and trainee captain in the command room of the "Dolphin" class Q001 submarine of the Indian Ocean Fleet of the Chinese Navy, he still knew quite well about the shipboard weapons on the "Dolphin". The Y-A 533-mm heavy torpedo was one of the most effective weapons for attacking and destroying enemy submarines, and the Y-A 533-mm heavy torpedo at that time was not as advanced as it is now.

Now the Y-A 533 mm heavy torpedo is a torpedo designed with a modular design and an open software architecture, powered by liquid fuel, and the guidance system uses a "blue sky 60486 microprocessor". The Y-A 533-mm heavy torpedo had two characteristics: firstly, it had a special surname for working in deep water. Its combat depth is generally in the range of tens to hundreds of meters, and it can also be launched at a deeper seabed. It can track the target submarine within the depth of the submarine, and does not affect its own navigation ability. Secondly, the Y-A 533-mm heavy torpedo had the special surname of two-plane tracking. Maneuvering in three-dimensional space under water, the Y-A 533-mm heavy torpedo is equipped with an automatic guidance system. When the torpedo finds the target of attack, the torpedo self-guidance system adopts a variety of guidance methods such as active and passive sound guidance or wake homing, among which "wake homing" is a more advanced guidance method, when the Y-A 533mm heavy torpedo detects and passes through the wake of the attack target, the rudder can be rotated at a certain angle in order to face the attack target, this homing method makes the Y-A 533mm heavy torpedo will be like a snake, shuttle left and right in the water to pursue the attacked target.

Under the control of the automatic guidance system or the wire guidance system, the Y-A 533mm heavy torpedo can freely track and attack target submarines and surface ships along the horizontal and vertical planes, and adopt variable advance angle tracking in the horizontal plane and tail forcing tracking in the vertical plane.

The Y-A 533 mm heavy torpedo, the heavy sword in the hands of the Chinese Navy, is the crystallization of the hard work of Chinese scientific research workers and workers, it is based on the information provided by the "base", imitation of the Yu-6 heavy anti-submarine torpedo products of later generations, developed and designed by the Chinese Research Institute, the Blue Sky Computer Research Institute, the 705 Institute of the Navy, and the Blue Sky University of Science and Technology. At the same time, many enterprises joined the production and manufacture of Y-A 533 mm heavy torpedoes, and Shanghai Precision Instrument Manufacturing Factory manufactured a new synthetic shell for torpedoes; Yanjing Rubber Factory developed a silencing coating for Y-turtlepedoes; Shenyang Electric Carbon Research Institute developed wear-resistant and high-temperature graphite materials for the engine valves and other parts of the Y-A 533mm heavy torpedo; Yucheng Long March Piston Ring Factory developed and manufactured the piston ring of torpedo propulsion

The US nuclear submarine "Villain" is faithfully fulfilling its responsibilities and escorting the "Enterprise" aircraft carrier fleet underwater.

The sailors on the day shift were crammed into the small resting space on the submarine and fell asleep.

In the command room of the "evil man", Vice Captain Finaklin put his feet on the small table in front of the captain's seat, boringly using nail clippers to carefully trim his nails.

The sailors in the bow torpedo compartment chewed gum to get rid of the bad breath caused by excessive stomach acid caused by the lack of oxygen in the body, and joked lewd with each other.

In the stern compartment, the sailors on duty check the operating temperature of the spindle from time to time.

In the power room, the chief engineer of the "Evil Man" constantly reminded the sailors of the reactor room, auxiliary engine room, and main engine room to check the operation of the main engine and reactor

Several sonars in the sonar room, wearing huge headsets, listened intently to the various sounds in the sea, and stared at the changes of various sound wave curves on the sound wave display.

Everything is normal, nothing out of the ordinary.

Suddenly, the sonar sergeant Sergeant Ratford, the black boy, widened his eyes, pressed the headset on his head tightly with both hands, and his expression suddenly became very focused.

"Not good!" Retford, the old black, jumped up like a burning ass and exclaimed, "Torpedo! There's a torpedo coming from behind! At the same time, the alarm sounded.

Suddenly, the bell of the entire "Villain" nuclear submarine rang loudly, and the red light flashed.

The officers and men of the US Navy aboard the "Evil Man" nervously rushed to their battle positions. Even the resting sailors were awakened by the sudden and rapid sound of battle sirens, and they did not have time to put on any clothes and began to prepare for damage management according to the plan.

Finaklin jumped to his feet and took off the buzzing phone hanging from the reinforced support in the command module, "Hello! hello！ What's going on? What the! Torpedo? Which direction, what direction? ”

"Behind the submarine, 165 degrees, at a distance of 3,100 meters, at a speed of 50 knots, 2 minutes to make contact with our submarine." Ritford reported hurriedly.

In order to avoid the attack of the torpedo at a small angle on the right side of the rear and get rid of this passive situation, Finaklin shouted loudly: "Right full rudder!" Fast! Right full rudder! ”

A sailor piloting the "Evil Man" nuclear submarine repeated the order of the deputy captain in a loud voice: "Right full rudder!" Another sailor pushed the rudder to the right as fast as he could, in order to get the submarine to adjust its direction as soon as possible.

"Float! Depth 100 meters! Open the outer door and the torpedo is ready! Finaklin gave a second order.

In the torpedo launch capsule of the "Evil Man", every battle station was filled with a tense atmosphere of preparation for war. The torpedo launcher is organizing the launch of the torpedo system, "Quick! Open the outer door and fill it with water! ”

"The outer door of the launch canister has been opened, and the water filling has been completed," the sailor in charge of the injection and drainage system reported to the launch chief.

"The launch switch is on," shouted the sailor of the torpedo launch system.

"The launch cylinder has been filled," the Air Launch System sailor reported.

(To be continued)