On June 22, the Germans attacked the Soviet Union. The arrival of Li Guang did not change the course of history, and the madman Hitler waved his butcher's knife at the Red Soviet Union before he had yet won victory on the Western Front.

In the Bay of Bengal, the submarine led by Ren Tianyang and the Japanese submarine have been entangled for several months. Relying on the aerial reconnaissance capability of the port, the submarine of the Maritime Resistance Army has made considerable gains on this battlefield. From February to June, an average of one a month, four Japanese submarines were sunk in a row.

But this battle is definitely not cost-effective for Li Guang and the Naval Resistance Army. The 10 submarines of the Maritime Resistance Army paid a great price in order to ensure the safety of Tang Port and the safety of merchant ships.

The cost is not casualties, nor the loss of ships, but the fact that the forces are pinned down and the military expenditure is extremely large.

In the past, the Maritime Resistance Army had been using submarines to attack Japanese merchant ships, and Li Guang only felt cool enough at that time. But when Tanggang was harassed by Japanese submarines, Li Guang also felt disgusted enough. Submarines are too much of a weapon for the Maritime Resistance Force. In fact, this is true for any country, and the cost of submarines and anti-submarine in World War II was about five to one. That is, the cost to the attacking side of the submarine is only one, and the cost to the anti-submarine side is five times greater.

In the past few months, not to mention the few surface ships, the consumption of ten submarines is greater than that of the operation, and the materials and fuel consumed every day are flowing outward like flowing water.

However, this kind of anti-submarine warfare is extremely effective for the training of new recruits, and after several months of fighting, the recruits of the submarine unit of the Maritime Resistance Force have quickly matured. According to the current progress, Li Guang estimated that by the end of the year, the Maritime Resistance Force would be able to organize 20 or more submarine groups. It is guaranteed that there will be about fifteen submarines operating in the ocean at any time.

During the four-month antisubmarine battle, the anti-submarine tactics of the Navy's anti-submarine tactics were greatly improved, and they gradually gained a set of means to deal with Japanese submarines. In the course of anti-submarine warfare, the Naval Resistance Force felt that the bottleneck of anti-submarine warfare still lies in technology, especially radar technology. The lack of radar technology has seriously limited the combat capability of the Maritime Resistance Force.

Matter is dead, man is alive. It is difficult to make a breakthrough technically, so we have to find a way to do it tactically.

On 22 June, Ren Tianyang led the submarine force to a breakthrough battle. After a long-distance tracking of five or six hundred kilometers, Ren Tianyang found the Japanese supply ship. Sink a Japanese submarine and a supply ship in one fell swoop.

According to the confession of the Japanese prisoners, the devil still has three submarines around Tang Harbor. At this moment, Ren Tianyang was happy.

The three submarines of the little devil simply did not have the opportunity to approach Tang Port during the day, and the water fighters of the Maritime Resistance Army practiced search tactics again and again. Although the anti-submarine tactics of the Naval Resistance Force are still far behind the British Navy - the main reason is the lack of radar. However, there are as many as 20 or 30 seaplanes of the Maritime Resistance Army, and while training troops, they are also responsible for the vigilance of Tanggang. It can be said that in the sea area within 500 kilometers around Tang Port, the survival of Japanese submarines may be quite low.

Almost all of the four submarines lost by the Japanese in the past few months were discovered by the Air Force while charging on the surface of the sea, some were directly sunk by the Air Force, and some were sunk by submarines or torpedo boats that arrived later.

The devils wanted to take advantage of the darkness to launch an attack on Tang Port, but it was difficult to break through the 500-kilometer defensive circle of Tang Port, and in this defensive circle, the Maritime Resistance Army deployed dozens of fishing boats to catch fish and keep watch at the same time. The more threatening force to the devil submarine comes from the air, and the fighter training of the Naval Resistance Force is almost non-stop day and night.

After all, the speed of the devil submarine is not high, and it seems impossible to sail 500 kilometers in one night, and this 500-kilometer defensive circle has gradually become an insurmountable obstacle for Japanese submarines.

There are many veterans in the Japanese submarine force, and once a submarine tried to take advantage of the rainstorm to invade Tang Port, but unfortunately it was discovered by the underwater listening system of the Naval Resistance Army in the port. Although he escaped from the shore by luck. But God didn't help the little devils, and after the sky was clear, he was discovered by a water reconnaissance plane, and finally fell into the sand.

As for the merchant ships that want to sneak attack Tang Port, the difficulty is not high, but too high. All convoys entering and leaving Tang Port were escorted by warships within 500 kilometers, and submarines farther away.

Although the cost of such an escort was extremely high, the efforts of the Naval Resistance Force stabilized the psychology of the military and people in Tanggang, and the development of Tanggang was not affected and gradually became more prosperous.

This time, after Ren Tianyang found out that he had packed up the Japanese supply ships, the ten submarines did not return to Tang Port, but went straight to the Strait of Malacca.

The little devil's Haida 3A submarine has a cruising range of only 6,800 nautical miles, and according to the report of the devil's captives, these three submarines should almost be refueled.

In other words, if the three submarines of the little devils want to return to their bases on Hainan Island, other paths are impossible except for returning to Hainan Island through the Strait of Malacca. And the communication range of the devil submarine is limited, no more than 1,500 kilometers. In other words, it is difficult to ask for help.

However, even if the devil can call for help, the supply ship is afraid that it will not be so easy to reach the Bay of Bengal. As for warships, the Bay of Bengal is not the Arabian Sea.

The control of the British army in the Arabian Sea was slightly worse, but in the Bay of Bengal, the British army had two military ports, one in Calcutta and the other in Trincomalee in Ceylon. And on the other side of the Strait of Malacca, Singapore, is a South Asian fortress for the British army. In the Bay of Bengal, the British navy was actually surrounded on three sides, and Japanese warships easily refused to enter this sea area.

For the Japanese army, the last attack on the Naval Resistance Army in the Arabian Sea was already an adventure, and going to the Bay of Bengal was even more desperate. As long as the Japanese army did not want to start the Pacific War in advance, it would never use warships to enter the Bay of Bengal.

Ren Tianyang led the team to the Strait of Malacca, and the seaplane carrier PJP with a Jianhua torpedo boat had also set off from Tang Harbor to expand the search area.

Four days later, three Japanese submarines were just about to assemble at the entrance to the Strait of Malacca when they were discovered by the Naval Resistance Army.

The first element of anti-submarine warfare, discovered. As soon as it is discovered, half of the battle is lost.

The whole battle was lackluster, with three Japanese submarines sunk by a submarine of the Navy, one by a torpedo boat on Jair, and the other captured alive by a seaplane PJP.

To Li Guangda's delight, the captured Japanese submarine was not even able to send a telegram. At that time, the Japanese submarine was floating on the water, and at the beginning of the battle, a water reconnaissance plane blew up the watchtower, and the Japanese captain Oda Ichiro was killed on the spot.

Regardless of the fact that the bombs carried by the water reconnaissance planes are only 60-pound bombs, it may not be enough to bomb warships, but there is no problem at all in bombing submarines. Moreover, the first bomb drop of this water reconnaissance plane of the Maritime Resistance Force hit the target, and its luck was simply outrageous.

The Japanese I-158 submarine was blown up and the watchtower was destroyed, and the superstructure was destroyed, so it was impossible to dive. Having lost their commander, the officers and soldiers had no fighting spirit.

The Japanese devils have always been tenacious, but this surrender was crisp and neat.

The Japanese submarine was captured, and Li Guang strictly ordered it to be kept secret. Taking advantage of the darkness of the night, the Japanese submarine was towed back to Tang Harbor for covert repairs.

This was the first time that the Maritime Resistance Force captured a Japanese submarine, and the capture of the Iraq-158 submarine made the Maritime Resistance Force improve its submarine technology again.

The general evaluation of Japanese submarines by technicians was that they were well-built, but they were quite flawed compared to German submarines. It is said that Japan is a nation that pays attention to details, but the technicians found that the submarine of the little devil was simply careless in handling some details, such as the shock absorption of diesel engines.

The diesel engine output shaft coupling of this era is generally a crosshead coupling, but the coupling of both the Navy and the German Army is equipped with rubber shock absorption, which can not only reduce noise, but also prolong the mechanical life and reduce maintenance. The little devil is amazing, it turns out to be a rigid connection of steel to steel. The base of the diesel engine is simpler, and only a layer of rubber pads can be added to reduce a lot of noise, but the devil is still rigidly connected with bolts.

After looking at the structure of this part of the devil's submarine, the officers and men of the submarine finally understood why the noise of the Japanese submarine was like a noisy percussion when sailing. It is very easy to be detected by the submarines of the Naval Resistance Force. The first thing in submarine warfare is to be hidden, but the noise of Japanese submarines is always loud, as if they are declaring "the devil has entered the village." The submarines of the Maritime Resistance Army attach great importance to sonar technology, so it is not surprising that the Japanese submarines fell into disadvantage in the confrontation.

But overall, the Japanese submarine is not bad. Haid 3A has several technical indicators that are also quite leading:

Especially the displacement: 1635 tons (water) / 2300 tons (underwater), buoyancy reaches 675 tons, which is higher than the Pixiu-class submarine of the Maritime Resistance Army, and the anti-sinking ability is not weak. And its speed: 20 knots (water) / 8 knots (underwater), which is not bad. Depth: 60 meters, which is not very good, but it is also the average level in the world.

It is a pity that the oxygen torpedoes of the Japanese army were still not captured. However, the 16 15-year-old 533-mm torpedoes captured were also thermodynamic torpedoes, which were very useful for the Naval Resistance Army. It is said that the Japanese army led the world in torpedo technology by 20 years in World War II, and that refers to the 93 oxygen spear torpedo. However, this torpedo is also a thermodynamic torpedo, and its performance still has considerable advantages over the thermodynamic torpedo developed by the Naval Resistance Army.

In general, the Japanese submarines have been of great help to the submarine design of the Naval Resistance Army. More importantly, it was the capture of this batch of torpedoes that made the thermodynamic torpedoes of the Naval Resistance Army really finalized in November of 41.

For Li Guang, from Mr. Ramo's torpedo to the final finalization, he secretly learned German torpedo technology, borrowed British torpedoes, absorbed French torpedo technology, and then copied Japanese torpedo technology, which took four years to finally finalize, and spent huge energy and financial resources.

The development of any weapon is not an easy task. The torpedo is a high-tech weapon in the world at this time, similar to the missiles of the 21st century. It can be said that of all the weapons in Li Guang's hands, only this one can be regarded as a high-tech product. As a time-traveling person, Li Guang was a little embarrassed, and it was difficult to manufacture high-tech weapons that were ahead of the century in this era. Even so, ninety percent of the parts were made from the United States, and most of the work at the torpedo factory on Stone Statue Island was just assembly. (In fact, batteries are considered high-tech in this era, but Li Guang did not count them.) ）

During these few months, the submarines of the Maritime Resistance Army were so severely pinned down that they were only able to send two or three submarines to attack Japanese merchant ships. Although no major results were achieved, the continuous attacks dealt a great deal of damage to Japan. With the improvement of intelligence, Japan's channels for importing oil from Borneo and Sumatra are now listed as a key target for the Naval Resistance Force, which killed more than 30,000 tons of Japanese oil tankers in June alone.

After the submarine force of the Maritime Resistance Army and the training of recruits came to an end, Li Guangyou was confident enough that he would be able to blockade Japan's crude oil imports with just a dozen submarines at hand.

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