The German navy is moving towards the ocean navy, and the construction of battleships, aircraft carriers, one after another, however, in terms of submarines, Germany is not lagging behind. Pen & Fun & Pavilion www.biquge.info

Dönitz is still in charge of the German Navy's submarines, and under his leadership, the performance of German submarines is also constantly improving, and now the VIIB submarine is being built.

The submarine force of the German Navy also has a long history, although the submarines were castrated after World War I, but with the gradual release of the restrictions of the Versailles Treaty, new submarines are constantly being built.

The latest submarines of this type, with a lengthened hull, improved fuel tanks, a supercharger on the diesel engine, and a stern torpedo tube inside the pressure-resistant casing.

Through the optimized design, the operation performance was improved, the speed and endurance of the submarine were improved, and a total of 24 ships were produced before and after, which belonged to the absolute main force in the early stage of World War II.

And now, under the sea, silently keeping sailing, is one of the legendary submarines, the U-47 submarine that entered service last winter, and belongs to the Seventh Submarine Force.

The propeller in the tail was slowly turning, and the entire submarine was sailing in absolute silence.

Submarines in this era are very noisy, and the main way to reduce noise is to reduce speed! The propeller in the tail can be seen with the naked eye how slowly it rotates, and the entire submarine is moving at an extremely low speed of 1 knot.

I didn't start the diesel engine, and the current depth is dozens of meters below the sea surface, and the distance from the bottom of the sea, I'm afraid it's only a few meters, this is an absolutely adventurous voyage!

Only the electric motor, under the power of the battery, makes a slight humming sound.

Inside the submarine, almost all of them were dark, and in the condition of the storage battery, all the electricity had to be saved, and at the same time, almost all of them obeyed the order to sail silently.

No one spoke up.

On the bridge in the middle, the bearded captain Captain Prion stood at his post with a serious expression, he was not wearing a shirt and looked a little untidy.

Once the submarine sails, if it cannot float, then a special smell will gradually condense inside the submarine, and the diesel fuel volatilized by the diesel engine and the smell of dozens of crew members will gradually condense together.

So, once out to sea, no one cares about their military appearance, submariners are often shirtless, after all, under water, it is not easy for them.

That handsome uniform, let's wear it when you go back to the shore.

In front of Prion is the helmsman, at this time, the helmsman also has a serious expression, they know what a terrible place they are about to enter!

Half a month ago, they went to sea, and yesterday they received an order to sneak into Scapa Bay tonight and wait for a scheduled attack!

For the German Navy, no one will forget Scarpa Bay, and many people have been thinking about how to attack Scarpa Bay since their first day in the Navy!

Among them, including Captain Prien,

Prion was just 30 years old, and he was at his most energetic.

Prien was born in 1908 in the town of Ostfeld, in the Prussian province of Saxony. After a few hours, life was difficult, and his greatest dream was to follow in the footsteps of his hero, the Portuguese navigator Vasco da Gama, and set sail.

In 1923, at the age of fifteen, he began to realize this ambition in life. After several years of hard work, he became the captain of the ship.

Just when the future beckoned him, the economic crisis came.

Prion lost his job due to the reduction in the size of the fleet, and in despair, Prion followed the rising Workers' Party and began his new life.

Prien first went to the light cruiser Königsberg before being sent to the submarine training school in Kiel.

During the Spanish Civil War, he conducted two patrols on the U26 submarine under the command of Captain Weiner-Hartmann. Last year, he became the commander of the current submarine.

On the entire submarine, only Prion knew that his destination this time was Scarpa Bay from the moment he just left the port, so he has been studying it for the past few days.

Scarpa Bay is 24 kilometers long from north to south and 13 kilometers wide from east to west.

After all, during the First World War, German submarine captains expected to be able to drill here to carry out attacks.

And the defense of submarines is also very easy, this port has 7 entrances, all of which have anti-submarine nets, and there are also minefields.

The anti-submarine net is very simple, just like an ordinary fishing net, arranged underwater, so that the warship on the surface of the water will not be affected, but the submarine sailing underwater will hit it headlong, and then once the propeller is wound on the net, it will be powerless to return to the sky, except to obediently surface the surface, there is no other way.

At the same time, Operation Rainbow in previous years, those German shipwrecks, will also bring inconvenience to the navigation of submarines.

However, these underwater facilities, after all, have existed for many years, so many of the equipment have been aged.

For example, at the entrance to the Kirk Strait to the east of Scapa Gulf, that is, at the 7th entrance, the wooden fence and anti-submarine net have fallen into disrepair and have lost their proper function, and in the past few days, the British Navy has dismantled this place and is ready to renovate!

This is the only chance!

The hull of the submarine suddenly tilted and grabbed the handrail beside him, Captain Prien looked calm, he understood very well that the sea outside was too turbulent.

The entire Holm Strait is turbulent, and it is almost impossible for a submarine to reach here, and the submarine can only go against the current if it sails at full speed, and once it sails at full speed, the loud noise will be exposed to the British.

Now, he could only sail silently at low speed, and now, a sudden intrusion of water almost brought his submarine to a halt, but he still did not give up.

Wait for your chance!

A few minutes later, suddenly, an even bigger shaking came!

"Attention, get ready, we're about to enter Scapa Bay!" Captain Prion said.

Coming soon!

The huge shaking just now, it was in reverse, this was the Hawkshad Strait was rising, this current, just enough to rush the submarine into Scarpa Sound, this was their only chance.

Sure enough, next, the entire hull, under the action of an ocean current, became lighter and faster!

As a submarine commander, you must be proficient in the use of ocean currents! In this way, it is possible to make the submarine sail even without relying on the engine! Historically, German submarines entered the Mediterranean, and that's what they did.

And now, with the help of this current, they have managed to cross the 7th entrance and enter Scapa Bay!