The biggest advantage of nuclear power is that it provides almost unlimited endurance, and the energy contained in the atoms is released through the fission situation, and the heat generated is like a boiler, which is used to heat water, turn it into steam, and push the steam turbine to do work, and then you can output energy.

The reducer can be used directly to drive the propeller at the tail to move the submarine forward, and at the same time, it can also drive the generator to supply power to the entire submarine.

This is the main principle of nuclear-powered submarines, and at the same time, one of the big problems with long-term endurance under water is oxygen, which is made by electrolysis of water for nuclear submarines, and the source of electricity is infinite anyway. At the same time, the source of fresh water inside the nuclear submarine is also obtained by desalination.

In this way, except for the food that needs to be prepared at the time of departure, everything else can be prepared at any time to meet the navigation requirements of the submarine to the greatest extent. How long they can sail underwater depends entirely on the self-sustaining ability of the submarine's crew.

Like now.

The underwater world is quiet, except for the steam turbine and the main reducer in the tail engine room, which make a slight low rumbling sound, the whole submarine is like a quiet big shark.

On the conning tower, Captain Otto Krezimmer was listening attentively to his subordinates' reports.

"Captain, according to our sailing route, we have crossed the Arctic ice cap, and the Chukotka Sea is ahead." The co-captain on the side said.

Otto was the number one ace captain of German submarines, with a brilliant record time and time again, so he was finally appointed as the captain of the first nuclear submarine, the U-801.

This number, which spans a lot of numbers, starts directly from U8, and later nuclear submarines will also increase backwards in turn, and in German shipyards, the number has been ranked to U811.

After lengthy sea trials, the submarine has already met the design requirements and even surpassed it in some respects. And the crew has also undergone rigorous training.

Even Otto studied the knowledge for half a year before graduating from the newly opened nuclear submarine command major and getting the certificate of nuclear submarine captain.

He is already familiar with all the structures of a nuclear submarine and is well aware of certain risks inherent in a nuclear reactor, and for him everything is aimed at victory!

"We have created a miracle and are the first submarine to cross the North Pole!" "Now, the submarine is on the surface, ready for starlight navigation," Otto said. ”

"Yes, ready to float." The co-captain followed and excitedly gave the order.

They sailed underwater for half a month, if it was a diesel-electric submarine, it would be unbearable, the noise of the diesel engine, the smell of diesel fuel in the air, the feeling of humidity, the smell of sweat, would make people have a feeling of nausea.

But now it's different.

Their submarine has always been quiet, and the oxygen produced by electrolysis even has a hint of fresh smell, which is a small amount of ozone produced, and the air inside the submarine is still good.

Of course, if they can float, they will still feel happy, and they haven't blown the sea breeze for a long time.

"The sonar room reports that there are no sounds from ships nearby."

"The ballast tank is drained and ready to float."

Under the ice, they have always sailed at a depth of about fifty meters, and now, with one order after another, the submarine with a displacement of 6,000 tons is slowly rising from the water.

The bow of the boat came out of the water first, and when its drop-shaped bow was exposed, it seemed like a huge whale rising out of the sea, followed by the hull behind it.

"Open the hatch." Otto said, climbing up the ladder.

In the past, the XXI submarine was only 2,000 tons, but now the nuclear submarine has been enlarged to 6,000 tons, which greatly improves the space of the entire submarine.

There was plenty of space on the conning tower, and Otto, who was wearing a military coat, could easily climb up.

Now, it's nighttime, and the sky is full of stars, and the cold wind is blowing, making people feel the cold wind, but the smell of this fresh air still makes people extremely excited.

It's the first time I've seen the outside world since I set sail.

Following him, the first mate on the boat also came out, picked up the starlight navigation equipment in his hand, and aimed at the familiar constellation, ready to make the first calibration.

In the navigation of submarines, it is also quite important to navigate and locate themselves, and in previous submarines, this contradiction was not prominent, because submarines were navigating on the surface most of the time, and how surface ships navigated, submarines navigated.

However, after the invention of the snorkel, the submarine sailed underwater many times, and the navigation at this time began to have a doorway, as for now, the nuclear submarine is completely underwater and cannot see everything on the water, and its navigation is more critical.

To this end, the designers of the submarine took the inertial navigation equipment used in the missile.

The core of the inertial navigation system is the gyroscope, the gyroscope is stable, through the measurement of the relative position, you can know the acceleration of the submarine itself, and then, as long as the acceleration is integrated once to get the speed, through the second integration to get the range, and the position at the time of departure is compared, you can then calculate the navigation parameters such as longitude, latitude, pitch angle, speed, sailing distance and course where the submarine is located.

It's just that this thing is not very sensitive, and before the invention of the laser gyroscope, the error of the mechanical gyroscope will continue to increase because of friction.

In this way, it needs to be calibrated after a certain period of sailing.

Starlight navigation is the most common way of navigation, and it can be said that it has been used by navigators since Columbus, and it is something that every sailor has to learn.

Now, the first mate carefully proofread it three times, and finally, with helplessness on his face: "Captain, after more than half a month of our voyage, there has been a great error in our course, and now, we are not sailing in the direction of the Chukotka Sea, and what we are about to encounter in front of us is not Wrangel Island, our course has deviated by a full 30 degrees, and we are sailing in the direction of Novosibirsk Island." ”

Inertial navigation system, the longer the time, the greater the error, the previous trial time was not long enough, and now, cumulatively, there is a huge error!

And for all this, Otto was mentally prepared.

"Okay, then let's adjust our course and sail east!" "Stay on high alert, and the crew will go up in groups of two for two minutes each," Otto said. ”

Now, it is still far from the coastline of the Soviets, and the Soviets do not have anti-submarine forces operating here, and it is night again, and navigation should be safe.

It's been more than half a month, and it's time for the sailors to come up and let the wind out.

Otto's order, which almost made the sailors shout hooray, lined up inside the submarine in order, ready to go up and let the wind out.

"Turn on the sea surface search radar, and the sonar room will be on alert."

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