Captain Hafs is now back in the Navy, and he has a new submarine, the U-92. This is a new type of submarine that has been newly produced, and compared to the original submarine, it is larger, more armed, and more self-sustaining. The underwater displacement of this submarine has already reached 1200 tons, and in the bow there are six fish. Thunder tubes, which can launch powerful 533 mm caliber heavy fish. Thunder, there are also two such fish in the tail. Mine tubes. Plus the fish. Fish stored in the Ryku. Ray, it's enough for Captain Hafs to have a good time in this hunting ground in the Atlantic.

However, what made Captain Hafs even happier was that they had finally let go of their hands and allowed them to freely attack any freighter sailing on the route to Britain and France, which naturally gave Captain Hafs more opportunities to gain combat results and promotions.

Five days ago, Captain Hafs's submarine attacked a container ship that was sailing alone, with two fish. Ray sent the cargo ship overboard. Three days earlier Captain Hafs's U-92 attacked a cargo ship laden with gasoline with a fish. Ray blew it into a torch. This morning, Hafs sank another cargo ship. In this way, although he left the battlefield for a while, Hafs's blessing seems to have returned, and his name appears on the sinking list again, of course, because of the time he was delayed before, so he is still a little far from the top, and for a period of time, everyone's results have risen very quickly, maybe when he goes back this time, there will be a big change in the ranking on the sinking list. So, Hafs has to work hard.

Hafs's submarine had been sailing the ocean at a low speed in a semi-submersible state, but until it was completely dark, he did not encounter any targets, and after the sun had retracted the last rays of light, Hafs let the submarine completely surface and let the crew members who had spent all day in the cramped cabins take turns to go up to the deck to breathe.

At this time, there was not a single wind in the sea, and the Atlantic, which had always been fierce, seemed to be asleep, and it was as quiet as a large pond. At this time, the moon had not yet risen, and the sky was like a black velvet cover covered with all kinds of shining gems on the sea, and the submarine shook gently, and the slight waves gently washed the submarine, making a gentle noise, and the low sudden sound of the submarine's diesel engine, but it made people feel extraordinarily quiet.

Captain Hafs looked down at the watch on his wrist, a high-end watch from the United States, a must-have for submarine commanders in the German Navy, because it had a special feature, that is, its hands and dial have a faint luminescence, especially suitable for use at night when there is a light control.

Luminous watches are actually nothing in later generations, and later generations generally use fluorescent substances to achieve this effect, some fluorescent substances can be excited as long as they are irradiated by light, and then they can fluoresce by themselves when they are exposed to the dark. But there is a problem with this kind of luminous watch, that is, its luminous light can only last for a short time, and if you need to work in the dark for a long time, this kind of watch is not suitable.

However, in this era, this was not a problem for MacDonald, because they had something else to replace the fluorescent substance used in later generations, and that was a compound of uranium, which was able to automatically fluoresce at night because of the radioactive nature of uranium. Of course, in later generations, this compound can't be used indiscriminately on something as close to the watch, if you think about it, people in later generations are so precious that they will be allergic to wifi radiation, and this thing, but it really has nuclear radiation, maybe it will lead to some cancer, what deformity, what transformation Ultraman and so on. But in this era, these can be ignored, anyway, people in this era do not know that ionizing radiation can cause harm to health. Therefore, even the fashion-loving Morgan wears this kind of luminous watch, and of course, the modest Scrooge would never use such a luxury.

It was already ten o'clock in the evening, and with a wave of his hand, Hafs drove a few sailors who were still on deck back to the cabin, and then prepared to go down himself, when he suddenly saw a little fire on the sea in the distance.

"What's that?" Hauffs thought, so he took the large telescope from the lookout Schiller's hand.

Telescopes of this era lacked coating technology, so imaging in low-light conditions was quite poor. If this is an army telescope, it is estimated that Hafs will not be able to see anything, but the telescope equipped with the Navy's submariners has considered the problem of night use, and the solution is simple, the amount of light entering is not enough caliber to make up. The telescope objective lens aperture in the hands of the army is only 30CM, and the aperture of the objective lens in the hands of Hafs is 80, but the magnification is only seven times, which is lower than the multiple of the army's small things.

Through the telescope, Hafs could see clearly that it was a British flotilla, with a dozen ships faintly in sight. As for the destroyers with or without escort, Hafs could not see very clearly.

Hafs estimated the distance, considered the course of the fleet almost parallel to his own, and then simulated a chart in his mind, and found that if he immediately changed the following course, he should barely catch up, but this required the submarine to be on the surface all the time.

"What should I do?" Hauffs thought. If it was daytime, he could only watch the fleet flee, but now it was night. "If you are chasing on the sea at night, the enemy should not be able to find out, right?"

"Our submarine was so low that from any British ship we were looking down, so that we automatically blended into the dark back of the sea. In the scene, there is no moon now, and the track brought by high-speed driving is also invisible, and it is completely possible to sail on the sea, or even approach the enemy directly from the sea, and treat the submarine as a fish. Mineboats, attacking directly from the sea. Hafs thought as he hurried down to the cabin and consulted with the co-captain.

"Hafus, I think that's a good idea." Deputy Captain Ram thought about it after hearing Hafus's thoughts. The treatment of the submarine forces is good, so the morale is relatively high.

"Well, let's take a risk." Hafs replied.

……

Just as Hafs had speculated, the British had never noticed a submarine coming towards the merchant fleet from the sea, simply because it was so dark, and the Germans were so painted with gray-black paint that they could barely see anything when looking down. In fact, not to mention submarines that are almost the same color as the seawater, even if it is a snow-white iceberg, it is not so easy to find at night, otherwise there would be no shipwrecks in the ice sea in history.

As for the sound of submarine engines, it was also drowned out by the roar of machines of the entire fleet. The British already had usable sonar on their destroyers, but at this time, passive sonar could not be used to judge the direction at all, and could only provide a vague early warning, and the judgment of the direction must rely on active sonar. However, this early sonar is still very important, because an experienced sonar soldier can hear the propeller of a submarine sailing under the sea, because the sound of a submarine's propeller is quite different from the sound of the propeller of another ship when sailing below the surface. And as soon as they hear such a voice, the destroyer will be ready for battle and turn on active sonar to search the sea area near the fleet. This may not necessarily catch the submarine, but at the very least, it will put a lot of pressure on the submarine, making it more risky and less efficient to attack. Now, however, because the U-92 is sailing on the surface, the sound state of its propellers has changed significantly, and it is completely different from what it normally would be when diving under the sea. In addition, since the U-92 is now on the water, active sonar for searching for underwater targets will naturally not come in handy. So, by using a night attack on the sea, Hafs turned the latest sonar equipment on the British destroyer into an ornament.

And just so, at a little over one o'clock in the morning, the submarine U-92 caught up with the merchant fleet.

"1, 2, 3, there are three destroyers, two in front and one in the back." On the watchtower, Captain Ram was pointing his finger at the back of the bright sky. In the background, the black silhouette of the British ship, which was very clear, whispered to Hafs, who was standing beside him, as if he was afraid that his voice would be heard by the British if he was a little louder. However, this concern is a little unnecessary, because the distance between the two sides is still about a thousand meters or so, and the British do not have such a tailwind.

"We can get a little closer." "You see, there's a big gap between the two boats, and we're going to get close to about 500 meters and launch a fish at target five. Thunder and then quickly plug in this gap so that we will be blocked by the six boat when the fish. When the thunder explodes, we won't be illuminated by the fire, and then we will shoot another fish at target two. Thunder then headed towards Ship Four, using it to dodge the flames...... What do you think? ”

Ram thought for a moment, nodded and said, "It should be feasible, you are the captain, give the battle order!" ”

"Okay, Ram, you go down and control the submarine, I'll command here, let's fight bravely for Germany." Hauffs said.

"Germany above all else!" Ram replied. Then he descended from the conning tower and entered the cabin.

"Turn the rudder to the 300 direction." Hafs gave his first order, and a completely new mode of submarine warfare began in this battle.