Not only the "Liu Changxun" was attacked, but more than one large attack submarine was launched.

Almost at the same time, the Zhou Kuande, about 50 kilometers northwest of the Liu Changxun, was also attacked by torpedoes.

A total of 6 heavy torpedoes were shot at the unlucky aircraft carrier.

The worst thing is that these 6 torpedoes come from both front and rear directions.

The frigate responsible for cover blocked two torpedoes, and the other four torpedoes hit the "Zhou Kuande".

Fortunately, only one torpedo detonated under the hull of the aircraft carrier, and all three torpedoes shot from the head of the ship hit the hull of the aircraft carrier.

Judging from the situation at that time, the submarine ambushed in front of the "Zhou Kuande" is likely to be affected by the escort warship, that is, the general destroyer that opens the circuit in front of the aircraft carrier. It adopts the attack mode of line guide and active sonar, and does not adopt the wake guide attack mode. Perhaps it is because it is worried that the torpedo will fall off the target, so the fixed depth is slightly shallower than the draft of the aircraft carrier, which causes the torpedo to directly hit the hull of the aircraft carrier.

Relatively speaking, the damage caused by hitting the hull is much smaller.

The reason is also very simple. The aircraft carrier itself has a torpedo compartment and a small sub-cabin structure. The huge internal space can absorb and disperse most of the shock waves, thereby reducing the damage caused by the explosion. In contrast, if the torpedo detonates below the hull, the energy released by the explosion will directly act on the hull of the aircraft carrier, such as the keel at the bottom, causing irreversible permanent damage to the main structure of the aircraft carrier.

If the torpedo is powerful enough, for example, developed by Xilu Group, the Type 65 heavy torpedo with a combat thunder head weighing 1 ton and a charge of 750 kg can even blow up a 10,000-ton warship into two parts. In some extreme cases, it is not impossible to blow up the keel of the aircraft carrier.

Although the MK48's thunder head is much lighter, its mass is about 250 kilograms and its charge is less, its ability to damage the warship cannot be underestimated.

If all four torpedoes detonate under the hull, the "Zhou Kuande" will definitely be in danger.

The key is that when designing the large aircraft carrier "Chen Bingxun" class, it only required that it remain unsinkable after being hit by three 533mm heavy torpedoes, and it was targeted at the first generation of heavy torpedoes that were put into service after the war, not the new heavy torpedoes like the MK48.

In theory, the probability of the "Zhou Kuande" being sunk by four heavy torpedoes exceeding 50%.

Although the torpedo hit the hull directly, the damage was lighter than expected, but no warship could be overcome by being hit by four consecutive torpedoes.

The situation of the "Zhou Kuande" can be said to be very serious and may be destroyed at any time.

The key is that the hit points of the three torpedoes shot from the front are all at the front of the port side of the ship, and the distribution range of the three hit points is less than 100 meters. The result is that about one-third of the cabin in the front of the port side is quickly flooded by sea water. In just a few minutes, the hull was tilted forward by about 10 degrees and the lateral inclination exceeded 15 degrees. In order to keep the aircraft carrier balanced, that is, to prevent the aircraft carrier from overturning, the captain has ordered water to be poured into the right cabin. Because the longitudinal balance is to prevent the keel from breaking due to uneven stress, water is poured into the right rear cabin. As a result, two sets of power systems located in the water injection area have to be abandoned.

There are only 4 sets of power systems in total of "Chen Bingxun"!

What's even more terrible is that the torpedo shot from the rear destroyed the No. 1 propulsion shaft on the outside of the port side of the aircraft carrier.

In other words, after filling the cabin at the rear right, the Zhou Kuande lost three-quarters of its propulsion power, and only one propulsion system was left to work normally.

Even if the servo can work normally, relying on a propulsion shaft, the speed can only reach up to 12 knots.

Because the left servo was also impacted and could not work properly, the right servo needs to be fixed at an angle to maintain a straight line, resulting in a lot of navigation resistance. Therefore, the actual speed can be achieved is definitely not 12 knots, and it is very good to be able to run to 10 knots.

According to the message sent by the "Zhou Kuande", it is undergoing emergency repairs with all efforts. It will take several hours to determine whether the aircraft carrier can be saved.

As long as you are attacked again, you will definitely be sunk.

Fortunately, after the "Zhou Kuande" was attacked, the escort warship discovered the sneak attack submarine and took action as soon as possible.

In fact, it is almost the same on the "Liu Changxun".

When the "Zhou Kuande" sent a message, the anti-submarine helicopter had found the submarine that sneaked into the "Liu Changxun" and called on other anti-submarine forces.

Although the distance was a little farther than the range of the anti-submarine missile, the general destroyer in this direction was unable to open fire at the first time, but was suppressed by two anti-submarine helicopters, and the Newland submarine could only escape, or to be precise, it could not even escape.

After about 15 minutes, two anti-submarine patrol aircraft sent by the "Liu Changxun" arrived.

If you want to say, anti-submarine patrol aircraft are anti-submarine weapons, and the nightmare of submarines!

Compared with anti-submarine helicopters, the biggest advantage of anti-submarine patrol aircraft is not only that it can fly faster, but also carry more anti-submarine equipment and anti-submarine weapons.

Take the Imperial Navy's "Patrol-4B" as an example. Under full load, it can carry 144 sonar buoys, 6 light anti-submarine torpedoes or 24 deep-water bombs. In a mission cycle, 12 fixed-point searches can be carried out and 6 attacks can be launched with torpedoes. Because two anti-submarine patrol aircraft are usually responsible for searching and attacking, their combat effectiveness must be doubled.

Obviously, no submarine can withstand the revolving attacks launched by two anti-submarine patrol aircraft with 12 anti-submarine torpedoes!

In fact, before the anti-submarine patrol aircraft arrived, two anti-submarine helicopters dispatched by the destroyer had already launched an attack and threw four anti-submarine torpedoes one after another.

Subsequently, two anti-submarine patrol aircraft used the information provided by anti-submarine helicopters to throw more than a dozen anti-submarine torpedoes in the direction where enemy submarines might escape.

As long as the submarine can be sunk, no one cares how many anti-submarine torpedoes are used.

Less than half an hour after the attack on the Liu Changxun, the destroyer commanding anti-submarine operations sent a message claiming that it had sunk the submarine.

It is indeed a large attack submarine of "Luocheng" class.

Shortly after the battle, the destroyer fished out some of the wreckage of the submarine, including several life jackets, and damaged balsamic furniture.

However, it took a few hours later that the destroyer used sonar to find the wreckage of the submarine that had sunk to the bottom of the sea and confirmed it to be a large attack submarine with a length of more than 100 meters. Because the water depth of the combat waters exceeds 2,000 meters, the officers and soldiers on the submarine had no chance of survival.

The anti-submarine battle lasted longer on the "Zhou Kuande".

Although it was confirmed at the first time that there were at least two submarines that had attacked the "Zhou Kuande", only one submarine was found within the first half hour.

The ship that was ambushed in front of the "Zhou Kuande".

It must be said that the captain of this submarine must be very bold.

In any fleet, especially the aircraft carrier special mixed fleet, the key areas of anti-submarine are in front of the route.

The reason is also very simple. The fleet's speed is faster, especially for aircraft carrier battle groups in combat states. The average speed is generally above 20 knots, while the quiet speed of large attack submarines is within 10 knots, not to mention that in order to save electricity, the time of high-speed navigation must be strictly controlled. Therefore, in combat, submarines often choose to ambush in front of the fleet's route rather than follow the fleet.

That's true, the fleet will definitely focus on monitoring the route ahead.

Then, in actual combat, submarines generally choose to ambush on both sides of the route, and after the fleet approaches, launch sneak attacks from the side or behind.

Only in this way can we avoid the anti-submarine warships located in front of the fleet.

Obviously, unless it is absolutely necessary, the submarine captain will not be stupid enough to go to the front of the aircraft carrier to die.

When the submarine was firing, it was about 40 kilometers away from the "Zhou Kuande", and less than 20 kilometers away from the destroyer "Yangcheng" which opened the road in front of the "Zhou Kuande".

It is not difficult to see from this that the boat has no time to maneuver to a more favorable position, and can only risk firing at the aircraft carrier under the nose of the destroyer.

As for the results, it is obviously not surprising.

Although the enemy submarine was not discovered at the first time, or the accurate judgment was not made, after the "Zhou Kuande" was attacked by torpedoes, the "Yangcheng" immediately took action, activated the active sonar inside the spherical bow, and discovered the enemy submarine in front.

The distance is so close that there is no need to deploy anti-submarine helicopters!

After obtaining the location information of the submarine in a few minutes, the "Yangcheng" launched four anti-submarine missiles in succession. Perhaps because he was worried that he would let the enemy submarine go away. After 15 minutes, the "Yangcheng" launched another round of attack and launched four anti-submarine missiles into the waters where the enemy submarine was located.

If you want to say it, that Newland submarine is also unlucky enough.

The "Yangcheng" is the 17th ship of the "Lucheng" class, and is the second batch after the major reform. Compared with the first batch, the most obvious change is that the multi-purpose launcher is replaced by an 8 set of eight-piece vertical launch system, which increases the load capacity and firepower projection density.

Usually, 64 vertical launch tubes will be loaded with 32 anti-submarine missiles, 16 anti-ship missiles and 16 medium- and long-range air defense missiles.

This is also easy to understand. After all, general destroyers are the anti-submarine pillars in the fleet.

Subsequently, an anti-submarine helicopter dispatched by the "Yangcheng" discovered the wreckage of the enemy submarine, which was to be precisely the remaining items floating on the surface of the Shanghai area.

However, anti-submarine operations in the other direction were not so smooth.

The main thing is that behind the "Zhou Kuande", there was only one ocean frigate, which was the "Lujiang" that blocked two torpedoes for the "Zhou Kuande". The ship belonged to the "Yichang" class, with performance not as advanced as it had a displacement of just over 3,000 tons, and it sank after it was hit by the thunder.

In other words, after the "Zhou Kuande" was hit by thunder, there was no escort warship behind it!

What's even more terrible is that the "Zhou Kuande" did not send anti-submarine patrol aircraft before Zhonglei, and did not even let the anti-submarine helicopter take off.

As a result, only about 25 minutes later, two anti-submarine helicopters from air defense cruisers arrived.

After missing the "critical 15 minutes", it is not so easy to find an escaped submarine.

Here, the most basic submarine tactics are involved.

To put it simply, any submarine will try to retain as much electricity as possible before launching an attack to ensure that it can escape at full speed after the attack.

If you want to say it, this is exactly the value of large attack submarines.

Because the tonnage is larger and can carry more batteries, it can sail longer at the fastest speed, so as to leave the dangerous seas before the enemy's anti-submarine forces can reach the end.

Of course, thanks to the more powerful propulsion system, the submarine speed of large attack submarines is basically above 30 knots.

In theory, a formation composed of two anti-submarine helicopters covers a sea area of ​​less than 10 nautical miles in a search, and is usually not reachable.

In this way, as long as the submarine can run 10 nautical miles before the anti-submarine helicopter reaches the point, the probability of escape is more than 80%.

This is also a major basis for large attack submarines to determine their performance indicators!

Even if it is in a combat state, anti-submarine helicopters take off urgently usually take 20 minutes to fly 50 kilometers away. Therefore, the fastest submarine speed of large attack submarines needs to reach at least 30 knots to ensure that they sail 10 nautical miles before the anti-submarine helicopter arrives.

Because there are various unexpected factors, such as searching for submarines, the reaction time left for the anti-submarine helicopter is only 15 minutes.

In fact, this is also the key reason why the Imperial Navy attaches great importance to anti-submarine patrol aircraft.

Even for a 10-ton anti-submarine helicopter, the combat radius is difficult to exceed 150 kilometers. Therefore, when pursuing large attack submarines that are escaping quickly, they are often unable to do so. In contrast, anti-submarine patrol aircraft not only flies faster, but also have a combat radius of more than 500 kilometers.

If you need to pursue a submarine, you must be able to rely on anti-submarine patrol aircraft.

Many times, the main method of anti-submarine combat is to pursue enemy submarines, rather than searching for submarines that have not yet been exposed.

The key is that it is extremely difficult to search for submarines.

It was not until 45 minutes later that two "Cruise-4Bs" dispatched by the "Liu Changxun" arrived. After that, two "Cruise-4Bs" from the "He Yongxing" arrived.

Within the following hours, several anti-submarine patrol aircraft and more than a dozen anti-submarine helicopters arrived.

However, until the fleet turned to evacuate, the Newland submarine was not found.

Strangely, no unknown radio signals were intercepted!

Generally speaking, after a submarine successfully attacks, it will issue a battle report after leaving the dangerous sea area at the latest. Large attack submarines generally use communication buoys. The key is that communication buoys can set working hours, such as delaying for several hours, so that the submarine has enough time to evacuate.

Obviously, it is indeed strange that the Newland submarine did not use the communication buoy.

It was not until the end of the war that the Imperial Navy learned that the submarine was also included in the "missing" list by the Newland Navy. It took more than 20 years before it was found by a civilian expedition team. The sinking site was a trench about 30 kilometers northwest of the sea where the "Zhou Kuande" was attacked. There was no trace of external attack on the wreckage of the submarine. It was very likely that it exceeded the maximum dive depth during emergency diving, resulting in the breaking of the pressure-resistant shell. Because it was a Otabashi structure, the boat did not even have the chance to save itself.

However, the submarine was not sacrificed in vain.

The three torpedoes launched by the boat not only sank the frigate of the Lucheng, but also severely damaged the Zhou Kuande. It was also the damage caused by this torpedo that caused the Zhou Kuande to retire early. However, the most important thing is that it actually attracted a large number of anti-submarine forces.
Chapter completed!