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After some careful preparation, "Hunting u571" finally started filming.

As always, this movie is still directed and starring Chen Fei.

The biggest difference between this movie and the original is that this movie tells the story of modern submarine warfare.

Modern submarine warfare?

This is a big gimmick. Not only are the audiences like it, but even some guys lurking in the dark couldn't help but get excited after hearing that Chen Fei was going to take such a thing.

Nothing else, there is too little information about modern submarine warfare. All countries regard it as a treasure and take strict precautions. It is even more difficult to get a glimpse of the truth from the public information.

It is almost impossible to peek into the submarine warfare in other countries.

But now, Chen Fei wants to make such a movie. According to Chen Fei's usual nature, his movies cannot be made out of nothing. Even if there are some fictions in it, most of them are based on facts. So... if you want to have a glimpse of the Chinese submarine, just focus on "Hunting U571".

Therefore, the news about this movie is on the headlines from time to time.

Chen Fei had no intention of making headlines, but some people who were interested tried every means to help him make headlines, in order to ask Chen Fei or the people in the crew to reveal something.

Therefore, Chen Fei basically didn't work hard to promote this movie, nor did he even spend much money, but the popularity of related topics and the exposure of the movie have always been at the forefront.

On this day, Chen Fei was talking to the heroine.

The movie "Hunting u571" has female characters.

Because this is a movie about modern submarine warfare.

Since it is a modern submarine, there must be female officers and soldiers.

Of course, among real submarines, there are only a few types of submarines that have female officers and soldiers, but is Chen Fei's filming a movie after all, so there are not only female officers and soldiers in the ordinary diesel submarines, but also several.

He is talking to the heroine: "In this drama, you are a calm and calm soldier. So when you encounter an emergency like this, you will feel nervous and even a little scared, but you will never show it on your face. Even if you show it, it will be very hidden, and your expression will flash in a flash. So your performance just now is too exaggerated and your facial expressions are too many."

He was just talking in a daze, and the assistant trotted over next to him and interrupted, "Brother Fei, the reporters are here!"

There are many reporters in "Hunting u571" visiting the set, and the frequency is very high. I came here today and a group of people tomorrow, which made several staff members who specially received the reporters a little impatient and complained to Chen Fei many times.

However, Chen Fei did not reduce the frequency of reporters visiting the set. First, they came to help promote for free. Of course, it was a good thing. How could he refuse? He planned to continue to use bombardment promotion methods for this movie;

Another factor is that he learned from relevant channels that a small number of these reporters who came to visit the set were ill-hearted.

So, he certainly can't refuse.

This is also the requirement of the relevant departments at the higher level.

Hearing the assistant's words, Chen Fei raised his head and said with a smile: "Take them in."

After the assistant left, he patted the heroine on the shoulder: "Okay, you go back first, think about what I just said!"

"Thank you, Brother Fei." The heroine said gratefully.

After a while, a group of reporters, led by their assistants, came to Chen Fei in a mighty way.

This time there were more than 30 reporters, including Orientals and Europeans. Among the Orientals, Chinese are the main ones, accounting for about two-thirds.

Everyone first met enthusiastically.

Afterwards, Chen Fei took everyone to visit the filming of the entire crew.

"Chen, since "Hunting u571" is a movie about submarines, there must be no shortage of torpedo combat, right?"

A reporter from a European entertainment media took the lead in asking his own questions.

"That's of course!" Chen Fei talked: "Torpedo is the most important combat weapon of submarines. How can it be missing in deep-sea combat? So in the movie "Hunting U571", we not only have a large number of torpedo combat scenes, but also some scenes of our submarine officers and soldiers escaping after our submarine was hit by torpedoes?"

"Chan, what did you say?" The French reporter widened his eyes and looked surprised: "Your submarine was hit by a torpedo, but your soldiers were not dead? Can you escape?"

Submarine escape is actually a compulsory course for submarine officers and soldiers, both in China and abroad.

But these things are very professional, and most people don’t necessarily understand them. What’s more, the reporter in front of him obviously came with the purpose of deliberately inquiring about something, so he made such exaggerated questions.

Chen Fei shrugged and replied with a smile: "Of course, our Chinese submarines are very strong and have strong vitality. Even if some places are hit by torpedoes, they can continue to fight. Even if some key parts are damaged, our officers and soldiers can escape safely through some methods! What's more, our submarines have advanced anti-torpedo systems?"

"Advanced anti-torpedo system? Chen, can you give me some details? How did you present this kind of thing in the movie?"

"Of course." Chen Fei nodded and then told the story.

Torpedo has always been the primary weapon used by submarines to fight.

Although modern underwater combat already has a series of weapons that are faster, accurate and powerful than torpedoes, as both concealed and low-cost weapons and are still the main offensive equipment for submarines.

However, with the development and evolution of electronic devices, clear countermeasures have been taken against torpedoes, such as silent killers.

There are four main types of countermeasures against torpedoes: concealment, interference, false targets and physical countermeasures, with different tactical and usage details.

Modern submarines use broadband passive sonar to determine the target orientation by collecting the signal-to-noise ratio signals in surrounding waters compared with quiet background noise. High contrast signals are displayed as shadows or color blocks on the sonar screen of the submarine. Early sonar targets are displayed in acoustic real-time trajectory line diagrams with peaks and valleys.

Anti-torpedo is an important means of submarine escape

The counter-torpedo also uses the signal-to-noise ratio signal on the receiving end of the torpedo to conceal itself. Of course, in addition to electronic fraud, torpedo anti-torpedo is also a major field. However, due to the bottlenecks of electronic equipment and software technology for a long time, this physical interception method has not become the mainstream.

This early electronic deception method was fired from the submarine into the water. The hidden ammunition released floating objects and could stay in a fixed depth of water. The components in the ammunition reacted with seawater and activated, and the thermal batteries powered the motor and other equipment, generating loud radio signals to cover the noise of the submarine itself. This way, high-frequency noise occupies the sonar screen, and the operator cannot screen out the noise signal of the target. However, this masking device has a short working time and sometimes requires multiple intervals to work continuously, and is difficult to work on active sonar and narrow frequency sonar.

The anti-torpedo methods since then have been developed on this basis. Russia's Vist-E combined broadband noise and active sonar interference, which not only emits interference noise, but also simulates the acoustic characteristics of the submarine itself and attracts active guided torpedoes. However, it is said that this bait also has a short working time, with a total of less than 10 minutes, which can only increase the chaos on the battlefield. More newer torpedo baits are all about extending working hours and integrating multiple composite interference systems. Some of the latest towed models can even be recycled and reused.

The underwater bait developed by Israel can be lifted and lowered independently at a depth of 10 to 300 meters underwater, and intelligently "detached" to torpedoes of different guidance types. After the battery is exhausted, the built-in software can be erased by itself to prevent leakage caused by enemy salvage. The 4-inch bait used by the British Navy's alert-class submarine is more advanced. It can be programmed electronic tasks before launching like a smart shell. After the threat is discovered, the submarine crew will quickly bind the required bait method for it, which is very flexible. The principle of the US Navy's MK4-1 sonar jammer is to emit a very wide frequency range of noise and continuously "create" multiple underwater fake targets to deceive the torpedo.

Chen Fei combined these things, real, fake, real, and even added some content he imagined out of thin air, so after hearing this, the reporter's heart was thunderous.

"God, China's anti-torpedo technology is so powerful, it's terrible!"

He was shocked.

"Chen, I heard that you will also shoot some submarine air defense operations in the movie. Is it true?"

A blonde foreign girl asked.

Chen Fei glanced at the other party and secretly wrote down her appearance. After a while, he smiled and said:

"In fact, since the aircraft joined the anti-submarine camp, submarine air defense operations have begun. In our movie, we present just a method that is so ordinary that it cannot be more ordinary in today's submarine operations."

He talked freely and told the things he had obtained from the earth after processing.

On Earth.

The earliest attempt was to use air defense missiles to counterattack first. With the advancement of air defense missile technology, this idea became possible. The United Kingdom was one of the first countries in the world to try to develop air defense systems on submarines.

In 1972, the British tried to install portable air defense missiles on the retractable mast of the submarine, and installed the "blow tube" submarine-launched air defense missile for the first time on the "Aeneas" submarine. Four missiles were integrated into the telescopic mast of the submarine's enclosure around a TV camera.

Later, the Israelis also installed the same short-range air defense system on one of their submarines, and the Soviets also tried it, but they did not put it into practice.

However, doubts were quickly made about the effectiveness of installing short-range air defense missiles on the retractable mast of the submarine, because to carry out air defense operations to strike enemy aircraft, the submarine must at least raise the mast above the water surface, which is equivalent to telling the enemy's submarine's location and is very susceptible to attacks by enemy anti-submarine ships and anti-submarine aircraft.

In addition, as the first generation of individual air defense missiles, the "blowing pipe" not only has a large size and a range of only 4.8 kilometers. It also uses radio control guide instead of passive infrared guidance. The shooter still needs to continue to guide before the missile hits the target, and cannot be ignored after launch. It is tantamount to commit suicide on an empty cross-section like the sea.

However, the emergence of air defense missiles is much stronger than that of human-operated anti-aircraft guns, after all, the probability has increased again.

It is said that Russia later developed a similar system, equipped with the "Kilo" class submarine, but there was no exact picture and data proof.

Entering the new century, the French missile, which is not to be outdone, has launched a submarine-launched air defense missile system called the A3SM submarine air defense weapon. It was developed by the French Navy Group and was unveiled for the first time during the 2012 European Navy Show. There are two versions: the mast model and the underwater carrier model.

The underwater carrier launches the Mika air-to-air missile based on the French Air Force, and uses the underwater dry-powered launch vehicle of the SM39 Flying Fish anti-ship missile, which carries the vertical Mika missile to the water surface and then launches the air-to-air missile. This can be integrated without special modifications for submarines that can be launched without special modifications and can be launched below 100 meters underwater.

During the combat process, the submarine crew relies on the passive sonar of the submarine to determine the approximate range, orientation, speed and heading of the air target based on the anti-submarine sonar buoys thrown by helicopters and anti-submarine patrol aircraft, and then launch a carrier carrying the "Mika" missile to a designated location. The carrier is launched at the designated location and then searches for the target until the target is shot down.

In addition to the carrier model launched underwater, the Navy Group has also developed a submarine-launched air defense missile system similar to the British "blowing pipe", integrating a missile launcher on the liftable mast. Inside the box is a Sigma infrared search instrument as a targeting device, as well as three "Northwest Wind" 2 short-range individual air defense missiles, which can launch air defense missiles at the periscope height. However, the "Northwest Wind" 2 air defense missiles use infrared imaging guides and need to be aimed before launch, regardless of the launch, the maximum range is 6.5 Km and the maximum speed is Mach 2.5.

In addition to missiles, the Germans began to try to use machine guns on submarines, and developed a 30mm Mauser RMK.                                                                                                                                                                                                                                             

In 2008, the system was installed on a MURAENA telescopic mast with a height of 3 meters and a diameter of 0.8 meters for demonstration. Later, the Mauser RMK 30 seatless machine gun was also installed in a TRIPLE-M multi-function container, which can also store underwater drones.

Initially, the Germans planned to deploy on submarines in the 212A and 212B projects, and Mauser RMK 30 coaxless machine guns to combat asymmetric threats such as pirates, small missile boats, etc.

At present, there are also conceptual research on equipting missiles on drones/cruising missiles launched by submarines, using their long-term cruise, searching and hunting anti-submarine aircraft in the air, further reducing the possibility of submarines being discovered.

For a long time, when facing aviation anti-submarine aircraft, submarines have always been in a passive situation. With the development of various creative submarine-launched air defense weapons, submarines will no longer be able to escape or sit and wait for death when facing attacks, and will also stimulate the emergence of various whimsical weapons.

In his movies, Chen Fei presented these air defense combat methods that have either already existed on the earth or are only in the conceptual stage.

Doing so will make the movie more popular and attractive on the one hand, and on the other hand, the tasks assigned by the superiors can be completed better.

His ideas really worked. After these reporters returned and related reports came out, the foreign military circle was in an uproar.

"Has China's submarines really advanced to this level?"

"There are so many types of air defense weapons, are they real or fake?"

So, when the movie "Hunting u571" was completed and began to prepare for distribution, one overseas distribution agency after another found Chen Fei.

"Chen, let's leave it to us for the release of "Hunting u571" in Australia?"

Chen Fei glanced at the other person with a squinted eyes.

He had learned about this person's situation in advance from the relevant departments.

So at this moment, I wouldn't use the way of entertaining real partners to greet him. I looked at him condescendingly, a little disdainful.

He just looked at the other person without saying anything.

When the other party saw him, he naturally thought that he was throwing the big name. He quickly smiled and said, "Chen, don't worry, we will definitely show enough sincerity!"

"Is that true?" Chen Fei smiled slightly.
To be continued...