Take Taobao to fight against Japan

"Very well, it's just about to dawn, then let them practice their hands! Order the anti-submarine helicopters and anti-submarine aircraft to dispatch immediately, and don't let these enemy submarines run away!"

The corners of Liu Qiang's mouth curled up slightly. It was no longer dangerous to be discovered by the enemy at this time, because not only was it dawn, but it was only 200 kilometers away from the port of Alexandria. .

As for the German submarine pack wolves tactics, don't even think about its effect. Their own naval fleet is not those transport fleets, but has super anti-submarine capabilities.

The more German submarines came, the more they died, and there was no need to make a wave.

"Yes!"

Nie Gang was also extremely excited. It would definitely be a pleasure to kill a few nasty enemy submarines before returning to the port to rest.

Chapter 1375 Wolf Pack Tactics

In the early morning of January 1942, 1, under the gray-brown sky in the Mediterranean Sea, a Type VIIC U-11 submarine was cruising on the sea.

The design of the VII-class U-boat started from the UBIII-class submarine. After the First World War, because the "Treaty of Versailles" restricted Germany from owning submarines, the military turned to subsidize the shell company established by its own shipbuilding company in the Netherlands - Ship Construction Engineering Bureau , secretly researching new submarines.

Class VII U-boats are the most produced submarines in history, with 709 built and many types.

The most famous of these is the VIIC type. The VIIC submarine has been the main force of the German submarine force in World War II since 1941, and its construction has not stopped throughout the war.

The VIIC submarine is a powerful combat machine and the most offensive submarine of the German Navy. It can be seen in almost all sea areas where German submarines are active.

Type VIIC submarine The last type VIIC/41 submarine has a diving depth that no submarine of any country can match for a long time after the war.

The boat has a crew of 52, a length of 67.1 meters, a width of 5.85 meters, a water displacement of 769 tons, and an underwater displacement of 871 tons. The underwater range is 17 kilometers/8 knots, and the design dive depth is 15742 meters.

鱼雷发射管数量5具，鱼雷总数14枚，武备配备1门105毫米甲板炮，1挺20毫米机枪。

As the first VIIC submarine in service, U-69 has been in service for almost 2 years, and the captain is 30-year-old Captain Hessman.

这是他和U-69的第3次战斗巡逻，超长的续航能力让他们在地中海上已经呆了4个月，累计的战绩是3艘商船共12780吨。

At this moment, U-69 took on an important task: to search for the Allied fleet attacking the port of Tobruk, and to wait for an opportunity to intercept the attacking Allied fleet.

After receiving relevant instructions last night, Captain Hessman ordered the U-69 submarine to search for the sea area where the Allied fleet was located as quickly as possible.

Hard work paid off, and finally the U-69 submarine discovered the Allied fleet returning at full speed before dawn.

Immediately afterwards, Captain Hessman immediately reported this information to the U-boat headquarters.

Chang Yuan's U-boat headquarters in Germany, after learning the relevant information, immediately summoned a group of U-boats patrolling the sea to form a wolf pack, and designated the U-69 submarine with a better location as the contact and tracking boat for the entire wolf pack. Provide intel to wolves and headquarters.

The U-boat command had extremely high expectations for this battle. It mobilized a total of 10 U-boats cruising in the Mediterranean Sea, and sent a very rare telegram to supervise the battle: "Don't shrink back, move forward at the fastest speed."

U-69 is far ahead of the fleet, constantly reporting the position of the fleet to the headquarters and other members of the wolf pack. At present, 4 U-boats have gathered on the route of the Allied Forces, and 6 more are gathering at the fastest speed .

"Oh, Shet, what's going on? Did they find us? How is this possible!"

However, at this moment, U-69 suddenly discovered that near the horizon more than 10 kilometers away, an escort destroyer came straight to him!

Not only that, but an anti-submarine aircraft is also flying at a very fast speed!

"Fack! Come on, dive right now!"

Seeing this, Captain Hessman immediately ordered an emergency dive. Its one 1mm deck gun and one 105mm machine gun were far from rivals for destroyers and anti-submarine aircraft.

Hessman didn't even have time to report to the headquarters, he must be very strange: at such a long distance, did the escort warship really find me?Is there a new type of long-range radar?

But the Metox receiver on his boat was unresponsive.

Soon, the local U-boat command in Germany also discovered similar problems. The escort warships and anti-submarine aircraft of the Allied forces became more and more active, and often the wolves greeted them proactively when they were still forming.

As a result, the U-boats can only be forced to dive, and once they dive, the U-boat will only have a speed of a little over 7 knots, and will be easily thrown off by the fleet.

U-boat commander Dönitz and his staff guessed that the Allies probably already had a new radar operating on a frequency outside the U-boat's warning receiver band.

Their guess was not wrong. The new shipborne centimeter wave radar of the Allied Forces was also put into use at this time, with a wavelength of 9.7 centimeters, much smaller than the 286 meter wavelength of the previous Type 1.5 radar.

The Metox warning receivers on the U-boats, which listen for meter wave radars, were completely unaware of the presence of the new radars.

Moreover, after the wavelength is reduced, the volume and weight of the radar are greatly reduced, and warships and aircraft can be easily carried; the resolution of the radar is also greatly improved, and even periscopes on the water surface can be found within a certain range.

"Oh, Shet! Damn it!"

"Quick, dive right now!"

The other three U-boats were also panicked at this moment, panicked and dived at the fastest speed. Facing the joint attack of destroyers and anti-submarine aircraft, they couldn't stand it at all!

When the current submarine attacks underwater, it must switch to electric to maintain good silence. If it dares to use the diesel engine during cruising, it will automatically kill people.

But because the current motor batteries are all old-fashioned lead-acid batteries, and the batteries can maintain underwater navigation for about half an hour to 1 hour at most.

Therefore, before the U-boat launches an attack, the submarine must float up and charge with a diesel engine so that the battery is full. Otherwise, let alone the loud noise of the diesel engine when charging underwater, the harmful gas generated by the battery during charging can poison a boat.

There are still a few tasks in the floating, which are to breathe and summon the wolves. After the wolves reach the meeting point, the wolves will discuss and coordinate the action plan.

Because the current underwater state cannot communicate effectively and quickly, it must be in the floating state.

This is why so many U-boats have to float together when implementing wolf pack tactics.

The high speed of the carrier-based aircraft can ignore the distance. Even if there is only one direction, the high-speed flying aircraft can quickly search along this direction.

Often U-boats are caught before they have time to dive, because it takes a minute for these big men to dive from the surface of the water, even if the four submarines do not fully surface, they just leak out the periscope to carry out Observe the target.

But at this moment, they are facing an extremely fast anti-submarine aircraft. It is not so easy for them to dive quickly and get rid of the lock.

"These Germans reacted quite quickly, but it's useless! Quick, throw a depth bomb and kill these Germans!"

Tian Tengfeng, the captain of the anti-submarine helicopter, flew towards the enemy submarine at the fastest speed after receiving the order.

A few kilometers away, he could still see the periscope protruding from the water, but just after flying not far, he saw the periscope retracted, and he could only come to the area he saw before by feeling. Blind fried.

Chapter 1376 Anti-submarine Operations

"Don't kill me yet!"

"Blow to death you gangsters."

Although the helicopter was flying fast, it was a pity that the German submarine reacted very quickly. Seeing that the situation was not good, it immediately retracted and began to dive and escape at the fastest speed.

When Tian Tengfeng and others flew to the sea, there was no trace, but Tian Tengfei didn't intend to just let go of the fat in his mouth.

Without further ado, Tian Tengfei and the others began to hurl one after another trigger-fuze depth charges into the sea below.

The system mall does not directly sell modern anti-submarine helicopters, and the helicopter Tian Tengfei is riding in is a modified primary anti-submarine helicopter that has been equipped with a search radar.

However, no radar can be used to detect submarines, because the radar waves of any existing radar cannot travel through sea water, and radar can only be used to search for submarines unless they surface.

thump!thump!

The depth charge weighing 29 kilograms fell into the sea water like dumplings, splashing up into the sky, and quickly sank with the infinite hope of Tian Tengfei and others.

But it is a pity that it is not known whether it is a memory deviation or the German submarine has already run away. After these depth charges were dropped, there was no response at all.

These depth charges are all trigger fuzes, and they will not explode if they do not directly hit the submarine.

Although it seems that there is no sense of accomplishment in doing so, and often not even a sound is heard, it will make people feel disappointed and lost to a certain extent.

But there is no way to do this. If you use fixed depth or timed depth charges, although you can hear a sound to some extent, once it explodes, it will generate a lot of noise, making it impossible to use sonar to search for targets for half an hour.

This makes it easy for enemy submarines to escape under their noses.

The harm between the two powers is the lesser, at this time I can only wrong my ears!

"Quick, move forward slowly, expand the range and throw bombs!"

Although there was no response after throwing several depth charges, Tian Tengfei and the others were not discouraged, and immediately moved forward to throw bombs.

However, the effect of such blind bombing is too limited, it all depends on faith!

Tian Tengfei and others worked hard for a long time, and almost all the depth charges were used up, but in the end they got nothing.

"Hey, you have to watch our performance in the end!"

At this time, Zhang Zhenghai, who was standing on the deck of the destroyer "Hades", picked up the walkie-talkie and said with a smile: "Old Tian, ​​please stop for a while, this kind of delicate work has to be done by professionals!"

"I believe you a ghost!"

Tian Tengfei, who was extremely unhappy, was tortured and washed away, and his face was as black as the bottom of a pot. It was really too dark today, and he threw dozens of depth charges but found nothing, and he couldn't even hear a sound!

However, the situation is stronger than people, and if you are not happy, you are not happy. If you should give up the C position, you have to give up the C position.

Immediately afterwards, Tian Tengfei ordered the helicopter to fly back to the ship and stop the anti-submarine operation.

At the same time, the other three anti-submarine aircraft also encountered the same situation.

The main reason is that they missed the best time!

If these U-boats were discovered when they surfaced to recharge, then these German submarines would never be able to dive so fast, and they would definitely be caught by the tail by the extremely fast anti-submarine aircraft and beat them all over the ground!

When the anti-submarine planes came in high spirits and returned in disappointment, several destroyers rushed over excitedly, like a school of sharks smelling blood, full of chilling air.

The destroyer "Hades" came quickly, and turned on the sonar while slowing down with confidence.

During World War II, the shipboard active sonar was usually used when the ship’s speed was lower than 15 knots. At this time, "Hades" had already exceeded 20 knots, but because the position of U-69 was very clear, it was still found by sonar detection. target.

Before and after the kill, the "Hades" first fired a round of 24 hedgehog bombs.

Hedgehog shells are electrically excited, 2 shells at a time, with an interval of 0.1 seconds, and 24 deep shells are fired at a distance of 200-260 meters in front of the ship to form an oval barrage with a length of more than 40 meters, like a goddess scattering flowers.

These deep-water bombs with slender bodies and smooth shapes sink very quickly, sinking to the bottom at a speed of six to seven meters per second, leaving very short reaction time for the submarine.

Hedgehog bombs use trigger fuzes, do not need to set the detonation depth, and are not affected by the submarine's dive.

Once it hits a submarine and detonates, the vibration will detonate the remaining 23 bombs, forming a deadly fire net underwater.The lethality of only 1-2 pieces is enough to sink the submarine.

But it is a pity that this round of hedgehog cannons that are determined to win has been hit, and there is still no explosion. It is obvious that the German submarine slipped through the net again.

Ten minutes later, the hedgehog shells were reloaded, and there was another set of 10 shells, but there was still no result.Then the target suddenly lost contact.

"Damn, what's going on here? Could it be that they really slipped out of sight like this?"

Zhang Zhenghai, the intern captain of the destroyer who was still mocking Tian Tengfeng and others before, frowned all of a sudden. The bull just now has been blown out. If he returns empty-handed after doing this for a long time, his face will be ugly. up!

Under Yang Fan's arrangement, officers and soldiers of the Huben Army Navy at all levels were dispersed and incorporated into the British Mediterranean Fleet, and they were infiltrated into various positions for in-depth study.

Zhang Zhenghai was assigned to the post of destroyer captain, and learned personally how to be a qualified destroyer captain from the British destroyer captain Lawrence.

Such blatant infiltration and stealing from all aspects really made British Navy Commander Cunningham extremely upset at the beginning, but they couldn't refuse Yang Fan's request.

Because Yang Fan has too many bargaining chips and black technology in his hands, and now for the UK, life-saving is the most important thing, and those naval technologies can only be placed in a secondary position.

"Quick, turn the rudder to the left! Go forward at full speed, the third scale is 150 meters east by north, the first set is 350 feet deep, and the second set is 500 feet!"

The "Hades" searched the sea very patiently for about 10 minutes, and the sonar recaptured the target.

但这一次英军舰长劳伦斯没有再命令使用刺猬反潜炮，而是使用了2组10枚定深350英尺（106.7米）和500英尺（152.4米）的深水炸弹！

Due to the background noise of the seawater at around 90 decibels, the German submarines have gradually drifted away. As long as they continue to flee and reduce the noise, the sonar will no longer be able to detect them.

What's more, the German submarine has sunk to a depth of more than 100 meters. Even if the hedgehog shell sinks fast, it will take dozens of seconds to reach that depth.

If you want to predict success and let these hedgehog shells hit the submarine, the difficulty factor will undoubtedly reach above 9.0!

So at this time, the experienced Lawrence decisively changed his posture and used large-tonnage and powerful fixed-depth water bombs to carry out range bombing.

Chapter 1377

"Hey, they are here, and they have been injured by us!"

Next, the "Hades" increased the fixed depth of the third group of bombs. When it was being dropped, Lawrence suddenly heard some different explosion sounds from deep underwater.

So, Lawrence made a decisive decision: "The third group is 3 feet! The fourth group is 550 feet! Hurry up and launch it immediately, others will run away!"

"Hades" unrelentingly continued along the escape route of the German submarine, dropping two sets of depth charges with a fixed depth of 550 feet and 700 feet.

It is well known that ordinary deep bombs are large in size and not smooth in shape, and their sinking speed is only 1.5-3 m/s, and it takes 200 to 66 seconds to reach a depth of 133 meters underwater. Under normal circumstances, a submarine can run tens of hundreds of meters. rice.

But the previous set of depth charges had already damaged the German U-69 submarine, and its action has been greatly slowed down at this moment.

Boom boom boom!

Sure enough, after waiting for more than a minute, Zhang Zhenghai and other crew members heard a particularly sharp explosion underwater, followed by a series of miscellaneous sounds.

After a while, oil stains and debris floated to the surface, and the wolf pack's liaison boat U-69 sank to the bottom of the sea forever with 53 crew members.

"Those who kill, people will always kill", the karmic cycle of retribution is not good.

During the two years of service of this U-69 submarine, eight merchant ships and transport ships were bombed and sunk one after another, and thousands of Allied sailors died in their hands.

At this moment, they finally died in the revenge battle of the Allied soldiers, and disappeared forever at the bottom of the extremely dark ocean!