It must be noted here that although the aircraft was already known as the submarine nemesis during World War II, because the sonar jishu was not mature and could not be installed on the aircraft, the aircraft during this period could only find submarines floating on the sea, but the aircraft was fast, and the submarine was often caught and killed before it had time to dive after it was discovered, and the old submarine had to surface most of the time because of the slow underwater navigation (and therefore extremely power-consuming), so it was particularly afraid of the aircraft.

The situation of the drop-shaped submarine is completely different, it has been active underwater for a relatively long time, not to mention that in this case they are even more impossible to float, the Americans can only rely on the sonar on the warship to search, and the sonar at this time can only find submarines a few kilometers away, and the underwater speed of the drop-shaped submarine is as high as more than 18 knots, which is not much slower than the anti-submarine ships sent by the Americans to search, and the Americans do not know their specific location, so they can only look for a needle in a haystack. I also have to prevent the enemy from sneaking up again and don't dare to send too many destroyers, and the sea area that can be covered is pitifully small, and there are ghosts that can be found

What's more, the U.S. Navy now doesn't know whether it was a brand-new submarine that attacked them, or whether it was searching at a relatively close range according to the characteristics of the old submarine, and it didn't even think that the enemy had already driven into the distance, which was impossible to find!

Although the commander of the escort fleet immediately decided to temporarily change the course and avoid the bad luck of being attacked again, only two of the four battleships were delivered, and the escort fleet itself suffered huge losses.

The setback was a heavy blow to the confidence of those who witnessed it. Quite a number of US officers and men have even suffered from "submarine phobia" as a result. In order to avoid a greater negative impact, Roosevelt had no choice but to let the Navy falsely report the results of the war. In any case, the U.S. government's control over the media is still quite strong, and as long as the results of the communiqué are in line with common sense, the public will generally not question them, but the results of the German Navy's announcement have not been believed for a long time because they seem too unbelievable

The Germans, on the other hand, were overjoyed by the outstanding performance of the teardrop-shaped submarine in its first battle, and the mustache decided to use more than eighty percent of the shipbuilding capacity to produce this new type of submarine. In contrast, Dönitz, a submarine expert, is a bit calmer, knowing that although the teardrop-shaped submarine is useful, it is not without its shortcomings.

The first is the high cost of teardrop-shaped submarines. It takes enough man-hours to build a drop-shaped submarine to build several old boat-type submarines; Secondly. Drop-shaped submarines are not easy to communicate with (Note 1), and this time the enemy's route is known to Germany in advance before they can be concentrated for a surprise attack, otherwise they are generally more suitable for single-boat attacks, and the "wolf pack tactics" have to rely on old submarines.

Of course. With extremely high combat efficiency and survival rate of drop-shaped submarines. The lead-up role of one is equivalent to a team of "wolves". Although the cost is high, the cost performance is still more advantageous than the old submarine, not to mention that the "Seiko route" is more suitable for Germany's lack of manpower and resources

Although the impressive performance of the teardrop-shaped submarine in the first battle boosted the mustache's confidence. However, the British still got two American battleships, and with their still overwhelming light ship forces, even if all three German capital ships were repaired, the German Navy might not be able to regain sea supremacy in the North Atlantic. What's more, the mustache also knows that the Americans' assistance to Britain will never end here, and what is even more terrifying is the strength of the US Navy itself, even if the performance in the first battle is not good, after all, the number of ships is there, even if he is arrogant like a mustache, he can't help but feel worried.

But this is also a helpless thing, if Germany wants to rise, it must defeat the United States, the first power, and Roosevelt's strategy forced Germany to be forced to directly confront the United States in advance. Now that Germany itself is insufficient, the mustache naturally wants to find more allies, the camp of the Axis countries is now quite large, but the sum is not enough to reach the United States, if you want to laugh in this Shijie war, the Axis countries need more powerful countries to join.

If we follow the idea that "the enemy of the enemy is a friend", it is obviously the best choice to pull the Soviet Union into the axis, but it is simply impossible, and not to mention that the Soviet Union and Germany are like glue at present, but that is just an illusion created by using each other, and there are irreconcilable contradictions between the two countries, both ideologically and fundamentally. In this case, the only potential allies that the mustache can think of are China and Japan in the East

The Japanese government agreed very simply, but in fact they had long been oppressed by the United States to the point that it was unbearable, and if it had not been for the fact that they had not known that they would be slapped to death by the powerful United States if they jumped out alone, I am afraid that they would have turned their faces on the Americans long ago. Now that Germany has taken the lead with the United States as Japan wishes, Japan will naturally not let go of this good opportunity to shake off the shackles of the United States and dominate the Pacific Ocean, and the German Government's agreement to let the two aircraft carriers of the German Far East Fleet cooperate with the Japanese Navy has greatly increased the confidence of the Japanese top brass. However, in order to succeed in tricking the Americans, the Japanese side on the one hand demanded that Germany keep it secret, and on the other hand, it accelerated its actions, so that when Japan suddenly made a move, the US Government was not able to react at all

Unlike Japan, the Chinese government unequivocally rejected Germany's invitation, on the one hand, because the ideology of Red China was fundamentally opposed to Nazi Germany, and it was reasonable to use each other, and if an alliance was formed, the Red Party would have to split internally; On the other hand, because the leaders of the Red Party were generally not optimistic that Germany would win the Shijie War, it would be difficult to change the final outcome even if the variable of Japan was included, firstly, Germany's industrial capacity, manpower and resources were much worse than those of the United States, and its ability to integrate the occupied areas was also unflattering (Note 2), so it basically did not help, and secondly, the Nazi regime was based on expanding for profit to lure the German people into serving them, and once the German army fell into adversity, it could not expand. The end of the regime is not far off, as can be seen from the fact that Germany has not yet dared to carry out a general mobilization at home

Note 1: Because most of the time it is active underwater, and the attenuation of radio waves in the water is extremely large, and it is completely impossible to communicate at a distance of more than 10 meters. This problem is expected to be solved after the invention of the blue-green laser communication method in later generations, but it is very difficult to jishu, and at the level of World War II, there is absolutely no possibility of successful development.

Note 2: Historically, the industrial strength of those countries occupied by Germany was not weaker than that of Germany itself, but except for the Czech Republic and Austria, which was not industrially developed, the other occupied areas did not play much role during World War II, and they were far inferior to the Soviet Union and the Allies in this regard, and to some extent even inferior to Japan, and even Chinese mainland insignificant industry was used by Japan as much as possible in history (to be continued......