While Wren and the others were joking with each other, others were going through a severe test, and the main theme of war was never about warmth, on the contrary, its character was very close to the waters of the North Atlantic, ruthless, brutal, and unusually cold.

A transport ship from New York to Iceland was originally loaded with a large amount of fuel, which, if delivered to the island, would be enough for the main facilities on it to last for a long, long time.

But one thing that is a pity is that the transport ship is now exploding, and there is a terrible explosion on the rough sea, and the huge flames burst and churn on the sea, and in an instant it seems that the sea water can be evaporated with that brilliant heat, and anything that stops this flame from burning, in this moment, it is eternal.

No one wanted to stay in the middle of this bursting flame, but in the middle of this flame was a huge ship sailing on the sea a few seconds ago, so it was inevitable that there should be a lot of people on it, but unfortunately these people were all gone now, and they were torn into dust the moment the explosion began.

In the face of such a tyrannical force, the death of these people can be said to be unusually merciful, and they may have lost their bodies before they even realized the pain. However, it is enough to see from this aspect that the destruction and creation of human beings by war are absolutely beyond anyone's imagination.

About 1,500 meters away from the sea where the explosion occurred, a submarine with very graceful lines was rising, and the icy sea water flowed out of some of the submarine's drains, leaving small white waterfalls on the dark hull of the submarine. And on the shell of this submarine, it is impressively numbered with gray-and-white numerals that have been corroded by seawater - U-47.

Before the submarine could fully surface, someone had already lifted the heavy waterproof and pressure-resistant hatch from inside, and the icy sea water dripped down and hit the brim of the hats of the people inside, crackling and crackling. Leather boots stomped on a ladder welded with iron, and the first soldier to get out of the submarine walked along the passage inside the conning tower to the folded anti-aircraft gun.

He and the two soldiers behind him began to aim the 40 mm Bofors anti-aircraft gun at the sky, and out of the back was a man with a white officer's hat on his head.

Just a few minutes ago, he personally ordered the fire, attacking the target of the explosion, and when he gave the order to fire, he had no idea what was on the transport ship, maybe hundreds of laborers, maybe just a boatload of vegetables and rice, but now he could clearly judge that the ship was definitely loaded with more oil than he could have imagined.

"Hurry up and send a telegram to headquarters saying that we have sunk a transport ship bound for Iceland with a lot of fuel on it. While lighting a cigarette with a lighter, Prien said indistinctly to his lieutenant who had climbed out of the hull to breathe.

It was so cold that if you wanted to get some fresh air outside the submarine, you had to put on a coat and a thick scarf, where you could talk in a fog and the temperature was low enough to wrap yourself in all your clothes.

No one wants to be sunk by the enemy in this kind of ghost weather, and then jump into the icy waters to escape. To be honest, in such a cold and harsh environment, falling into the water or sinking with your own battleship is just choosing a way to die.

Either sink to the bottom of the sea with your own ship, although you are aggrieved, but it is relatively fast, or you can jump into the sea to escape, the way to die at this temperature is similar to those passengers on the Titanic who are soaked in the water, ten minutes at most half an hour, it is possible to freeze to death in the cold seawater.

Therefore, Prion thinks that it is better to be a submarine officer and soldier, even if it is sunk, there can only be one way to die, which is very simple and does not need to waste his brains.

One of the last "holidaymen" to get out of the hatch of the submarine handed a telegram to Prien, who was smoking, and several German sailors, shivering in the cold wind of the sea, were talking about something, laughing heartily from time to time.

Since they arrived on this new submarine, it seems that all threats are gone, the depth charges dropped by the opposing ships are basically inaccurate, and they can easily get rid of the opponent's entanglement with only a few maneuvers. Surrounded by destroyers and cruisers, Prion led the U-47 submarine to come and go freely, sinking one destroyer and three transports before calmly leaving.

He liked the feeling of playing with his opponents, like an assassin with great skills, using his agility to tease his enemies. He disappeared into the dark corner, stabbed the deadliest blow, and then calmly left, leaving deep fear and despair for others who saw what was happening.

On the route between the United States and Iceland, there was a ghost submarine, this submarine attacked the United States and British ships everywhere, but it was not afraid of depth charges at all, many British sailors said that this submarine did not exist, it was just a German submarine that had been sunk, and kept sinking the enemy to calm their grievances.

Even more bizarre is that the souls in this submarine have vowed to sink all visible ships, because they need a full 1,000 times more souls to bury themselves. Rumors like this are circulating everywhere, and rumors spread to every corner as quickly as they can spread like gossip.

Although the analysis of experts from the American and British navies is more accurate, they believe that the Germans have commissioned a more advanced submarine, using newer technology to increase the speed of the submarine under water. On the other hand, the Allied intelligence services also confirmed this information, and in the German submarine base in France, a repair dock and concealment shelter were specially set up for such submarines.

Obviously, more often than not, a terrible submarine piloted by a black devil that will never sink is far more satisfying to people's curiosity than a new submarine of the German Navy, so everyone is still more willing to believe the bizarre and nonsense than the ordinary answers given by the higher-ups. The reason is actually very simple, it's just not exciting enough.

Prion took the telegram from Germany from the sailor's hand, and after only two lines of reading, he was speechless with excitement. It was difficult to guess the contents of the telegram from his agitated appearance, so the first mate could only suppress his curiosity and wait for Prien to hand him the telegram.

He didn't have to wait long for the message to come across the message, which was very simple: four equally advanced submarines had crossed the eastern Atlantic Ocean and approached the waters off Iceland, and they were going to join Prien's submarines in forming a wolf pack to attack all ships on the route between Iceland and the United States.

The telegram also made an appointment with the sea area of several submarine turns, and drew up a code to meet, if this rendezvous can be successfully completed, then Prion will have more and more advanced submarines in his hands. The threat posed by the wolves would be even more terrifying, enough to depress the British in the waters near Iceland for days.

"Call back immediately! Tell Commander Dönitz that we have received the message! Immediately rush to the agreed sea. Prien raised the corners of his mouth and let out a very big smile. Those who knew him well knew that whenever he showed this expression, there must be an enemy ship that would be unlucky.

In the distance, the fire was still not extinguished, and the poor ship had been torn into countless pieces by the blast wave of the explosion in the seconds after it was hit, and now even the wreckage was gone, and the sharp bow had sunk into the bottomless abyss of the Atlantic.

The dark smoke obscured everyone's view, but it could not stop the transmission of radio waves, and soon, on the machine in front of the radar operator on duty inside the submarine, the alarm sounded suddenly: "Woo...... Woo......"

"Attention to all personnel! Attention to all personnel! If an enemy patrol plane is approaching, return to the inside of the submarine immediately! After 2 minutes, the submarine will start diving! 2 minutes later, the submarine will start diving!" Throughout the interior of the submarine, a prompt announcement came out of the loudspeaker, and the sailors approaching the hatch had already slid down the iron ladder into the interior of the submarine.

The anti-aircraft guns on the alert sailors over there have already begun to fold the anti-aircraft guns that are not very useful, and since the anti-aircraft warning radar was equipped, how useful the anti-aircraft guns on the submarines are have become a constant debate among the submarine commanders of the Navy.

Prien's face, which was smiling evilly just now, instantly turned into a bitter smile, after all, this is an area where enemies appear intensively, and it seems that it is still a little difficult to take a break here. He burrowed into the interior of the submarine, and behind him, the last first mate to enter the submarine, reached out and closed the heavy submarine hatch.

In rough seas, the seawater around the submarine began to pour into the submarine's tank, and as a large amount of seawater squeezed out the lighter air, the submarine sank into the sea at a speed that could be seen by the naked eye. In a short time, the hull of the submarine was gone, and only a command enclosure remained, still exposed on the water.

Immediately afterwards, the shell of the submarine conning tower also began to sink into the water as the submarine began, and white waves were churning around it. It wasn't long before a few limited long tubes, such as snorkels, were left on the surface of the sea, where there was still a ship sailing.

After another ten seconds, the waves on the sea had returned to normal, as if nothing existed here, nothing.