At first, they were silent, but in less than ten minutes, the discussion between the two men about the submarine and the tactics of the submarine was white-hot. The small reception room was soon filled with models of submarines and merchant ships, and Colonel Dönitz even had a large blackboard drawn with submarine formations and submarine attack tactics. At first, Dönitz intended to conceal the current achievements of the German submarine fleet, but as he spoke, he naturally told the current problems and experience of the troops.

Li Kongrong came prepared, in addition to his own memories and the knowledge of Major Li Kongrong, he even summoned the trainee officers in Germany to do similar deductions, so he could deal with Dönitz for the time being. However, in addition to being close to Dönitztaus, he also came for the purpose of changing the fate of the German submarine force and allowing the XXI submarine to appear in advance. This was one of his sub-plans to interfere with the course of World War II: to delay the surrender of Nazi Germany so that the Russians could not take a break from attacking the northeast, so that the industrial equipment of Manchukuo, which had been dismantled by the Soviet Union, might be preserved, and Outer Mongolia would likely return.

Of course, he knew that if his actions were discovered, he would definitely fall into a passive situation in the future, but now that the war had not begun, even if he was sued at the Nuremberg Tribunal in the future, he would have enough excuse to escape accountability. As for the uneasiness of conscience, he could only tell himself that what he was doing now was not for personal gain, but for the future of China; Regarding the impact of the civil war later, he believes that Adou is Adou, and no matter how he supports it, once the civil war starts, the Red Party will eventually win. With the complete industrial equipment of the puppet Manchukuo, the country is at least no longer poor and white.

And the return of Outer Mongolia is of great significance. Considering that China and the Soviet Union will inevitably turn around after Hemaize comes to power, once Outer Mongolia returns, the geostrategic security of the Beijing-Tianjin region will be greatly improved, and it is likely that China will hold the strategic initiative in the Far East rather than the Soviet Union; Then there is a huge impact on Xinjiang, because there is no need to be wary of Mongolia, and the situation in Xinjiang will return to the Mongolian and Hui before the division of Outer Mongolia. People balance each other, not like the Hereafter. The family is the only one.

All this made him completely disregard justice and morality to 'aid' the Nazis, but man is not as good as heaven, and how history will change is completely beyond his judgment and control, and God will eventually decide.

The meeting, which began at a quarter past eight in the morning and lasted until the afternoon, Colonel Dönitz dismissed all business except to argue with the Chinese naval lieutenant about the tactics of joint submarine attack. However, he was a little annoyed from the afternoon, because during the exercise, the Chinese constantly used radar to detect submarines and attack submarines, which was a situation he never imagined.

"It's impossible! Mr. Major. Throwing away the chalk in his hand, Dönitz could no longer deduce, and he could only question that the Chinese had set it up too miraculous - he didn't believe that something called radar could find a small periscope of a submarine.

"It's entirely possible, Mr. Colonel!" Li Kongrong retorted politely at all, "This is also the question I thought of when I used a gunboat for the last exercise, and my country's telecommunications experts told me that radio detection technology has been able to detect ships on the sea, and once the wavelength becomes smaller and the size of the radar is reduced, then it is not difficult to find the periscope of the submarine at all." ”

"But how long will it take?" "It may take decades to ......," Dönitz asked rhetorically.

"No, Mr. Colonel, the airplane was just invented in 1903, but no one dared to question the status of the airplane in the last war, did it? Now radio detection technology is just getting started, but who can doubt that it will have to be decades before it makes great progress? The threat of aircraft to submarines has existed since the first day of its invention, and now the power of the aircraft is getting higher and longer, and once equipped with a sensitive radio detector, it can search for submarines in the entire sea area, even at night, so I say that it was impossible for submarines to float and recharge at night at that time.

Another thing that worries me is that future planes don't need to notify warships to round up submarines when they spot them, they can throw a kind of unpowered gliding bomb guided by a small radio detector, which is silently approaching in the dark of night, and then destroy the submarine as it floats to recharge. Imagine that even if Germany had such industrial capacity, it might not be able to withstand such equipment and personnel losses, and China would not be able to ......"

"Major, you're saying that your group fighting tactics are impossible, right?" Dönitz suddenly felt that this Chinese was probably a spy, and his purpose was to make himself abandon this tactic.

"No, no, you're mistaken, Colonel." Li Kongrong didn't know what Dönitz was thinking, but he really didn't come to ask Dönitz to give up the wolf pack tactics, he came to save the wolf pack tactics. "I have always believed that submarines will last longer than battleships, and even if battleships are eliminated in the future, submarines can still gallop across the ocean. However, submarines at that time had to be submarines in the true sense of the word, not just torpedo boats that could dive. ”

"A real submersible?!" Dönitz read the word, thoughtfully.

"Yes." Li Kongrong looked at his brain and nodded heavily, "Maybe because of technical limitations, we can't keep the submarine underwater twenty-four hours a day, but we can minimize the time for the submarine to surface." For example, the snorkel equipment I mentioned just now, as far as I know, although there are many countries that have frequent accidents due to snorkels, the Netherlands has mature snorkel technology. If the submarine can be fitted with a snorkel, then it does not need to float to complete the charge, because it is only a tube sticking out of the water, and the probability of it being detected by radar will be greatly reduced. ”

"I know about this snorkel technology, but how does this non-surfacing submarine detect enemy ships, attack merchant ships, and communicate?" Dönitz stared at the Chinese, not knowing whether it was because of doubt or expectation.

"In my consideration, there is a complex solution, but it involves the design and production of the submarine fleet as a whole, which cannot be realized in China." Li Kongrong said with annoyance.

"First of all, the underwater submarine must be able to travel at high speed and for a long time, so as to solve the problem of pursuing merchant ships, and if you can't pursue it, you can't talk about discovery, so the submarine must be designed to be streamlined, and the deck guns must be removed, so that the speed can be accelerated; The battery also needs to be doubled so that it can maintain a long underwater range.

Only after the underwater pursuit capability has been solved can we take into account the detection problem. The pattern of the entire attack tactic is not much different from before, it is still to receive wireless telegraphy from the shore base, and then go to the predetermined place to ambush. But the difference is that under the threat of the escort fleet, the submarine will most likely detect enemy ships no longer through periscopes, but through sonar. ”

Speaking of this, Li Kongrong picked up a model of a submarine, pointed to the side of the submarine and said: "If a row of sonar can be installed at a fixed gap on the side of the submarine, or even a towable and recoverable sonar array equipped with sonar can be installed on the submarine, then the submarine can calculate the approximate position, speed and angle of the target through sonar from different positions, so that the torpedo can be launched not on the surface, but underwater." Therefore, my answer to the first question is that the shore commander and the submarine sonar array cooperate with each other to detect the enemy ship, and the answer to the second question is that the submarine uses the sonar to detect the distance parameters of the enemy ship and attack underwater.

The third problem is how to communicate, which is not a difficult task, it has been discovered a long time ago: if the radio wavelength is more than 10,000 meters, then the degree of attenuation in the water will be reduced, which means that ultra-long-wave radio signals can be transmitted underwater, although only ten meters or even only a few meters deep, but obviously this can transmit information below the surface of the sea.

And how does the submarine send a message? The best solution I can think of is a towed communication buoy, similar to a towed sonar array, but it should be longer and cut off if not needed to ensure the safety of the submarine. ”

After answering Dönitz's three questions, Li Kongrong said with a smile: "This is an upgraded version of the group fighting tactic, the purpose is to dodge the radar aircraft that can bring huge losses to the submarine. I don't think the Chinese Navy can do that, but I hope it can be done with the German Navy. I am especially happy when I think that those huge, stupid battleships have nothing to do with underwater ghosts, and although submarines are weak, the weak also have the ability and dignity of the weak, and they are not useless. ”

Perhaps thinking that Li Kongrong was referring to something, Colonel Dönitz suddenly felt a little embarrassed, and it happened that both of them had stomach growls, and he smiled: "Your proposal is really good, Mr. Major." But I think we should have lunch first. ”

"No, it's supposed to be dinner." Li Kongrong looked at his watch. When it comes to eating, he feels like his stomach is burning and his whole body is exhausted and powerless—it is a very exhausting task to convince others, to go out of their way to persuade them.

"Then let's have dinner together." The clock was already pointing to five o'clock, and Dönitz had never noticed that time had passed so quickly.

After a discussion that forgets time, a pleasant and harmonious dinner, and after eating, the two men hand each other cigarettes and light the fire, and the mood slowly ignites at this time. However, Colonel Dönitz was obviously more reserved, he did not say much, but looked at Li Kongrong again in the smoke, and he suddenly sighed how nice it would be if he were German! And Li Kongrong thought about the two training submarines: how nice it would be if Dönitz suggested that the Admiralty sell those two submarines! However, when he had just gained the favor of the other party, he felt that he should not make such a request.

"It's wonderful!" As he puffed out the smoke and looked at the neat streets of Berlin, he still had to praise the city and its citizens, even though he knew the final fate of the Nazis years later.

"It's all because of the Führer!" Colonel Dönitz made no secret of his admiration for Hitler. "In the past, Berlin was full of unemployed workers, the streets were filthy and the people were hopeless. It was the Führer who gave us hope that everyone should have dignity as a German......"

"It's just a pity that there is no Hitler in China." Li Kongrong shook his head and sighed, as if he wished to be German.

"Your Führer......" Dönitz did not know much about China, and his impression of China was the same as that of other Germans: it was a bandit-ridden, backward, poor agricultural country, similar to India under British rule, and perhaps even India, at least there were not so many bandits.

"Chang Kaishen!" Li Kongrong said. "He is only the nominal leader of China, but he is only recognized by foreign governments."

"Then why can't he build a party similar to the National Socialist Party and then unify China?" Dönitz asked.

"Because he is not the head of your country, he came to power with the support of foreigners, and the head of your country came to power with the support of the German people." "So he doesn't have the power and cares a lot about the opinions of foreigners, but his ideal is to get all foreigners out, and I really don't know how to describe him." ”

Because Admiral Raeder had previously explained that China's Central Navy was actually just a Hanseatic navy, Dönitz was not surprised that Li Kongrong criticized his leader, and he didn't mind hearing that Chang Kaishen had come to power on foreign support. He said, "What is the situation in your country like it was during the Weimar government in Germany?" ”

"Yes, just as the French occupied the Ruhr area, the Japanese occupied the northeastern part of our country, that is, Manchuria, and they have not withdrawn their troops until now, and they have also supported a puppet government there, like the Rhine Republic, which the French have always dreamed of." Li Kongrong said bluntly. "It is undeniable that an excellent nation should occupy a greater living space, but the Japanese are not better than us."

"At least the Japanese Navy is strong." Dönitz blinked his eyes and said something shallowly.

"But they're going in the wrong direction." Li Kongrong defended. "Big ships and artillery will soon be out of the way, and they will only be replaced by aircraft carriers and submarines. For hundreds of years, the dimension of war has been increasing, and a long time ago the offensive was just a line-to-line confrontation, but the subsequent wars quickly changed this, and the war became a face-to-face confrontation, but since the last great war, the dimension of war has evolved to a body-to-body confrontation, which is more obvious at sea. The role of surface warships is declining, and the planes taking off from aircraft carriers and submarines moving underwater have pushed the war into a three-dimensional age.

Although Japan has many aircraft carriers, they have never thought that they can replace battleships, and they also have many submarines, but they have never understood real submarine warfare. That's why I say that the strength of the Japanese Navy is only superficial, and that the strength is nothing more than learning from the West for decades, and then naively thinking that it can replace the West and build Asia into a royal paradise, and this East Asian dream will eventually be ruthlessly shattered by reality. ”

"Major ......" Dönitz never expected Chinese not only an expert in submarine tactics, but also a strategist, and he unconsciously asked a question, "Then what do you think of Germany?" ”

"Germany?" "The fate of Germany is actually determined by the sea, as the last war showed. No matter how great the victory is on land, if there is a defeat on the sea, it will also be a defeat in the end. Therefore, I have always believed that submarines were the only hope for German victory, especially the development of new submarines and the implementation of more powerful and stealthy submarine group tactics. ”