Transmigrated as the Crown Prince

Yannick originally wanted to imitate the example of the sneak attack on Pearl Harbor and hit the Scapa Flow Naval Base. However, the Navy's surface fleet failed to live up to the expectations and could only rely on underwater submarines to complete this important task. Fortunately, he had made two preparations. He had discussed the sneak attack plan with Dönitz a few years ago and conducted special training.

But to be precise, it should be a third-hand preparation. If the submarine sneak attack fails, he will send the air force and army aviation bombers to attack. But in that case, the loss of the fleet should not be small, and the bombing effect may not be guaranteed.

Finally, just a week ago, Gautprien's U-47 submarine loaded with secret weapons set off from the port of Kiel.

They sailed along a carefully planned route via Wilhelmshaven to the North Sea, where they changed course to the south and submerged to avoid being discovered by surface ships. It stays in the dark and emerges at night, sailing underwater during the day and emerging from the water at night.

The sky had completely darkened, and U-47, which had been sailing underwater for a whole day relying on navigational maps and calculations, finally surfaced and began to adjust its course. The submarine's sailors also took the opportunity to climb onto the deck for a short break. The cool and fishy sea breeze blows in your face, the sea is covered with mist, and the sound of waves comes one after another.

Even at night, the North Atlantic is still not calm. The submarine is swaying left and right with the waves. After all, this is a warship of less than 1,000 tons. It cannot have the seaworthiness of a surface warship of thousands of tons. At least at this stage, a submarine is a submersible vessel, not a potentially underwater vessel.

"It's such a nice weather." Pullien murmured softly, holding a cigarette in his mouth and looking at the bright stars in the sky. They were very close to Scapa Flow. This was the last time they surfaced to rest in this mission. The rest of the voyage would be completed in dangerous water.

Of course, this may also be the last time they surface in their lives.

Touching his greasy hair, he shook off this ominous thought. Several days of continuous sailing have left him with a beard, and his hair is quite greasy, as if he could squeeze out a few drops of oil by twisting it. You must know that fresh water on board is especially precious during a long voyage. There are special personnel to manage the faucets. In addition to drinking water, the water used by submariners for washing every day is measured in tea cups, including washing face and brushing teeth. They often use a towel dipped in a little water to wipe their face after brushing their teeth. So shaving, washing hair, taking a shower, etc. are just a luxury.

After the short break time, the sailors got back into the submarine one by one. Pullien looked around habitually and was the last one to get in after making sure there was no problem. "Dive to a depth of 30 meters and maintain course. Turn off the main lighting power after 5 minutes."

After continuing for more than seven hours, the submarine finally arrived at the entrance to the Cork Channel around 1 a.m. the next day. "Attention everyone! We are at risk of being sunk every minute in the next minute! Everyone, prepare for battle!"

According to previously collected intelligence, it is extremely difficult to enter Scapa Flow via the Cork Strait and is almost impossible to penetrate. To prevent submarine attacks, the water in the strait, which is less than one kilometer wide, is densely covered with man-made shipwrecks and other underwater obstacles.

However, because of this, the precautions here were relatively lax, so Dönitz chose this route, and the U-47 submarine was sailing forward along this route.

The so-called "extremely difficult" is not just talk, a powerful tide flows into Scapa Flow from here. U-47, caught in the tide, was swaying like a canoe caught in the rapids. U-47 not only had to fight against this current, but also tried its best to prevent the submarine from colliding with underwater obstacles. The most dangerous time was when everyone heard with their own ears the sound of the collision between the bottom of the submarine hull and the mooring cables laid on the seabed. This collision almost caused the submarine to run aground. If Pullien had not ordered the emptying of the water tank in time and urgently floated up, I am afraid that they would have All have to be explained here.

It was like walking on the edge of a knife. After experiencing several life-and-death dilemmas, they finally entered Scapa Flow.

"God bless!" Prien breathed a long sigh of relief and wiped the sweat from his face.

"Perhaps the heroic spirits of our ancestors have blessed us." The first mate continued, holding on to the armrest and panting heavily.

Prien nodded. "It's time to avenge them." He walked to the periscope and observed the situation outside.

"Oh, what a guy!" Prien couldn't help but exclaimed in exclamation. What he saw was an extremely huge fleet. Although it was difficult to see the specific warships at night, just by looking at the huge figures of the warships, he knew that they were at least 20,000 to 30,000 tons.

He immediately ordered excitedly. "Ready for action!"

He was talking about preparing for action, not preparing to launch torpedoes, because what he was preparing to use this time was not a submarine torpedo, but a secret weapon, a "human-operated torpedo."

Speaking of "human-operated torpedoes", the most famous one should be the "Kaitian" man-operated torpedoes of a certain island country.

This "Kaitian" human-operated torpedo is modified from the Type 93 oxygen torpedo, with a diameter of 1 meter. The torpedo can carry one crew member. The crew member uses a small periscope to confirm the position of the enemy ship and control the torpedo. The "Kaitian" carries 36 tons of explosives, three times more than ordinary torpedoes.

In November 1944, the first batch of "Kaitian" was carried by the submarine mothership to the combat sea area, preparing to attack the U.S. fleet. Unexpectedly, the U.S. military's anti-submarine capabilities were very powerful. Before the torpedo mothership could release the "Kaitian", they were hit one after another. Only a few of them rushed towards the U.S. ships, but under the fierce fire of the U.S. warships, only one U.S. oil tanker was sunk at the anchorage.

However, what is little known is that the Italians were the first to develop human-operated torpedoes, and they successfully developed and put them into use as early as the end of World War I. They blew up the flagship of the Austro-Hungarian Navy, the "United Forces", but the pair were killed three days later. There was no point in surrendering to Austria-Hungary.

These Italians are quite persistent and have been tinkering with their human-operated torpedoes; in 1935, they came up with the design of a large-scale human-operated torpedo, which was named "Slow Torpedo" and later became more famous as "Pig" (Maiale). Because it looks like a swimming pig and is easily manipulated. Two crew members can ride astride the Pig's mine body. The Pig is powered by a 1-horsepower electric motor and 30 60-volt battery packs mounted between the two crew members and at the rear. It can cruise 4 miles at 5 knots and 15 miles at 3 knots.

German engineers have improved this torpedo. The total length of the torpedo is 5 meters longer than the original version, reaching 8 meters; the original version is an 8-meter-long tactical bomb head loaded with 300 kilograms of powder, while the German version has been improved to 2 meters. The tactical bomb head is 350 kilograms long; the battery capacity has also been greatly improved.

This time they brought four of these mines, which should be more appropriately said to be thrusters. These four propellers are fixed on the shells on both sides of the submarine. They will have to climb out of the submarine later. First, they will untie the four propellers, and then fix the tactical bomb head pushed out from the torpedo launch port to the propellers, and then approach The enemy ship removes the tactical bomb head and fixes it on the bottom of the ship, sets a timed explosion, and finally uses the remaining thrusters to retreat.