Strictly speaking, Britain is an island country like Japan, and it is not even as large as Japan, and of course Germany is not as large as Japan.

To paraphrase the data of the later generation network, if it is placed in China, it is approximately equal to the total area of Jiangsu Province + Zhejiang Province + Anhui Province + Shanghai City. Japan gives us the impression of being small, mainly because of the fact that its land is particularly narrow and thin.

Therefore, for Britain, one of the protagonists of World War II, once it defeated Britain in a naval battle, it would be a huge disaster for Britain, which was completely dependent on the sea, because the defeat of the naval war was to be blocked by the empire to block the coastal transportation lines, thereby starving the inhabitants of the island.

Even if you don't starve to death, you will lose your status as the supremacy of the sea, as well as the power of all overseas colonies, and natural resources.

Therefore, in this regard, Chen Yanlong decided that he must win the naval battle and let Britain and the United States lose this naval battle.

Of course, with the good fortune of having a smartphone exchange system, he didn't worry about weapons and equipment.

But since he found out about his smartphone's cheating behavior, he is unwilling to rely entirely on this phone to exchange for more weapons and equipment.

Because if this mobile phone stops being exchanged and closes itself like it is now, then what weapons and equipment will he have to fight against the British and American forces at that time? Although he has stored a lot of advanced weapons and equipment in the storage base he has established, he can't always sit back and eat nothing.

Therefore, for Germany, which did not have much storage of weapons and equipment before the war, now Chen Yanlong wants to use the wealth he plundered from the occupying power to produce more of the most advanced weapons and equipment of the German army during World War II in the shortest possible time, as well as submarines.

Because throughout World War II, the German fleet was suppressed by the British and American fleets to fight, and there was not much dazzling record, but the German submarine force shocked the world and achieved good results.

Moreover, now Chen Yanlong asked Speer to produce the U-XXI submarine, which is also the most advanced submarine that the German army has the ability to develop and produce, so he is not worried at all that the German army will not be able to produce it.

It's just that the production of this type of submarine is more advanced than the main VII U-boat used by the German army, including the VIIC/41 submarine.

After dealing with the submarine and hanging up Speer's phone, Chen Yanlong continued to think about how to improve the combat capability of the air force, especially in terms of altitude, speed, accuracy, breadth, and strength, as well as the combat performance of the aircraft, as well as strategy and tactics.

And Speer, who hung up the phone by Chen Yanlong before he could reply, was full of black lines, depressed and stunned with the phone in his hand, and stood still.

"300 U-XXI submarines, produced in half a year?"

"You are God! Monarch! ”

At this moment, Speer's heart was depressed and roared.

The German U-boat was the most powerful and effective weapon of the German army in World War II, and the sneak attack was its most successful tactic, especially the wolf pack tactic created by Dönitz.

However, at the end of World War II, with the emergence of a variety of anti-submarine weapons and technologies, especially radar and sonar applications; The German submarine sneak attack tactics were getting weaker and weaker.

Of course, in later generations, the upgrading technology of submarines is also becoming more and more advanced, such as those nuclear submarines.

However, at present, Germany has no way to develop such an advanced submarine as a nuclear submarine, so in terms of the technology of the U-type submarine that the German army has now, the U-XXI submarine, that is, the Type 21 submarine, is already the most successful and advanced technology.

"It seems that we have to talk to the experts of the Naval Technical Committee, 300 U-XXI submarines will be produced within half a year, this is not a joke! This is a difficult production task! ”

"And even if it is produced, those submarine members still need to undergo rigorous training to familiarize themselves with a large number of new equipment in the submarine before they can go to sea to conduct military combat operations!"

After complaining, Speer fell into deep thought and muttered sullenly.

But just as Speer was about to leave for the Naval Technical Committee, Chen Yanlong rushed to the office of the German Naval Technical Committee with the design drawings of the nuclear submarine in a hurry.

The experience of using submarines during the Second World War revealed a big problem, that is, the time that submarines can continue to sail under the surface is completely limited by the battery storage capacity in the submarine, even if it is sailing at the lowest speed, it must surface after a period of time to recharge, and the submarine is very vulnerable to attack in the process of charging.

Another limitation is that if the submarine wants to track the high-speed ship to attack, the submarine must surface to output power with diesel engines to barely catch up with the slower fast ship, but in this way, the submarine will lose the protection of the sea water and the combat advantage, thus exposing itself to the enemy's attack.

Therefore, in order to make the submarine's combat more concealed and the ability to continue navigation under the sea more durable, in 1946, a group of scientists led by George Rickover began to study the use of atomic energy reactors, which were later used on submarines to power navigation.

So in the 50s, the world's first nuclear submarine "Nautilus" was born in the United States.

The design drawings of the nuclear submarine that Chen Yanlong is holding now are the design drawings of the world's first nuclear submarine, the "Nautilus," developed and produced by the United States.

The reason why Chen Yanlong suddenly wanted the German Navy to develop nuclear submarines was because he was worried that the anti-submarine technology in the late stage of World War II would become more and more advanced, so that the 300 U-XXI submarines he had just ordered Speer to build would gradually be consumed by the powerful anti-submarine capabilities of the British and American forces in naval warfare.

It's just that even if the development of nuclear submarines has design drawings and manufacturing data, it does not mean that they can be manufactured immediately, and they can be mass-produced, because there are still many technical problems that need to be studied and solved by the German Navy's technical department, which has no experience in manufacturing nuclear submarines.

"I don't know how long it will take for the current German Navy Technical Department to develop and produce the nuclear submarine I need after getting these design drawings and data sheets!"

Escorted by his own guards, Chen Yanlong, who was sitting in the car, muttered anxiously.