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

The propeller at the tail can be driven directly through the reducer to allow the submarine to advance, 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. At the same time, for a long-term battery life underwater, one of the big problems is oxygen. For nuclear submarines, they are made by electrolyzing water. Anyway, the source of electricity is endless. At the same time, the source of freshwater inside nuclear submarines is also obtained by seawater desalination.

In this way, except for food that needs to be prepared when you set off, everything else can be prepared at any time to meet the submarine's navigation requirements to the maximum extent. The specific length of time it can be sailed underwater depends entirely on the self-sustaining ability of the crew inside the submarine.

For example now.

The underwater world is quiet, with only the turbines and main reducers in the engine compartment at the tail, making a slight and low rumbling sound, and the entire submarine is like a quiet big shark.

On the command tower, Captain Otto Clayzimmer was listening carefully to his subordinates' reports.

"Captain, according to our sailing route, we have crossed the Arctic ice sheet, and the Chukochi Sea is in front of us." said the deputy captain next to him.

Otto is the number one ace captain of German submarines, with brilliant achievements again and again, so he was finally appointed to become the captain of the first nuclear submarine U-801.

This number spans many numbers. Starting directly from u8, the nuclear submarines will also increase in order. In German shipyards, the number has been ranked u811.

After a long sea test, the submarine has met the design requirements and has even surpassed it in some aspects. The crew has also undergone rigorous training.

Even Otto has studied knowledge for half a year before he graduated from the latest nuclear submarine command major and obtained the on-the-job certificate of the nuclear submarine captain.

He is already familiar with all the structures of nuclear submarines and is also well aware of some of the risks contained in nuclear reactors. For him, everything is aimed at victory!

"We created a miracle, the first submarine to cross the Arctic!" Otto said: "Now, the submarine is floating on, ready for starlight navigation."

"Yes, prepare to float." The deputy captain gave the order excitedly.

They sailed underwater for half a month. If it were a diesel-electric submarine, it would be unbearable. The thumping noise of the diesel engine, the smell of diesel in the air, the feeling of moisture, and the smell of sweat will make people feel sick.

But now it's different.

Their submarines have always been quiet, and the oxygen produced by electrolysis even has a refreshing smell. It is a small amount of ozone, and the air inside the submarine is still good.

Of course, if you can float up, it will still make people feel happy. They have not blew the sea breeze for a long time.

"The sonar room reported that there was no sound of ships nearby."

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

Under the ice, they had been sailing at a depth of about fifty meters. Now, with the issuance of orders, the submarine with a displacement of 6,000 tons slowly floated under the water.

The boat head first comes out of water. When its water-drop-shaped boat head is exposed, it seems like a huge whale floating on the sea, and then 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, greatly improving the space of the entire submarine.

There is plenty of space on the command tower, and Otto, who has put on a military coat, can easily climb up.

Now, it is night, and the starlight is everywhere above our heads. The cold wind blows, making people feel the biting cold wind, but smelling the fresh air is still extremely exciting.

It was the first time I saw the outside world since I set out.

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

During the navigation of submarines, their own navigation and positioning are also very important. In the past submarines, this contradiction was not prominent, because submarines spent most of their time on the water surface, and the submarines would be navigation as they navigate the surface ships.

However, when the snorkel was invented, submarines often sailed underwater, and at this time, navigation began to have a way. As for now, nuclear submarines were completely sailing underwater and could not see everything on the water surface, their navigation was even more critical.

To this end, the submarine designers brought over the inertial navigation equipment used in the missile.

The core of the inertial navigation system is a gyroscope. The gyroscope is stable. By measuring the relative position, you can know the submarine's own acceleration. Then, as long as the acceleration passes one integral, you can get the speed, and the range is obtained through the secondary integral, and compare it with the position at the departure time, you can then calculate the navigation parameters such as longitude, latitude, vertical and roll angle, speed, navigation distance and heading of the submarine.

However, this thing is not very sensitive. Before the invention of laser gyroscopes, the error of mechanical gyroscopes would continue to increase due to friction.

In this way, calibration is required after a period of navigation.

Starlight navigation is the most common navigation method. It can be said that it has been used by navigators in the Columbus era, which is something that every sailor must learn.

Now, the first mate carefully proofreaded three times, and finally, with helplessness on his face: "Captain, after more than half a month of sailing, our course has had a huge error. Now, we are not sailing towards the Chukochi Sea. What we are about to encounter before is not Flanger Island. Our course deviates from a full 30 degrees, and we are sailing towards the Novosibirsk Island."

The longer the inertial navigation system, the greater the error. The trial time in the past was not long enough, but now, after accumulating, there are actually huge errors!

And Otto was mentally prepared for all this.

"Okay, then we'll adjust our course and sail eastward!" Otto said: "Keep on high alert, crew members will come to the top to let the air, each group of two minutes."

Now, the coastline of the Soviets is still far away, and the Soviets have no anti-submarine forces to operate here. It is night again, so sailing should be safe.

It has been more than half a month since the sailors come up and let go.

Otto's order was about to make the sailors shout long live, they arranged in order inside the submarine, ready to go up and let the air go.

"Open the sea search radar and the sonar room is vigilant."
Chapter completed!