Captain Prien's submarine was the first to arrive at Scapa Bay. As early as the early morning, he crossed the waterway and lurked here.

At that time, if he wanted to attack, he would choose any warships in the harbor, and of course he would put his target on the Royal Ark carrier first.

Or, other aircraft carriers and battleships can pick up a big pick. At most, they can launch four torpedoes at a time, and they don’t believe it and can’t kill the other party.

However, he did not move. If he moved at that time, it would disturb the British people here and make them more alert. The air strikes in the morning could not be carried out.

According to the plan, as long as your own bomber starts to drop bombs, the U-47 submarine will be able to operate.

In fact, he did the same, sitting in the sinking water and keeping silent. In the early morning, when he heard the first explosion on the water, the officers and soldiers in the entire submarine took action immediately.

Start the engine and float to the depth of the periscope! The sailors were preparing quickly.

The submarine with a huge body of more than 800 tons was floating slowly. The two Aeg gu 460/8-276 electric motors at the tail burst out with a maximum horsepower of 750 horsepower, and the propeller at the tail quickly reached a maximum speed of 296 rpm.

At this time, there is no need to worry about the other party's anti-submarine system. After all, the other party has been covered by the bomber, and it is too late to deal with the bomber above his head. How could he take care of the underwater situation? The explosions one after another will cover the sound of the submarine.

Now, they must act quickly, take up space and prepare for attack!

In the torpedo compartment of the boat head, the sailors were ready and just waiting for the fierce attack to begin!

Operating a submarine is not as easy as driving. Although they have operated at the most skillful speed, it took about three minutes to level the submarine at a depth of ten meters underwater. Then, the periscope stretched out on the submarine's bridge.

Just as the periscope was extended, a thicker tube was slowly rising on the side of the submarine's bridge.

This tube is much thicker than a periscope. When it is not used, it is placed vertically flat on the submarine shell.

Now, the hydraulic device on the side makes the thick pipe stand upright, the roots rotate, and the automatic locking pin fixes the pipe to the rear of the podium enclosure.

It has been a long time since the submarines were used to use periscopes. It can be said that since the submarine entered the naval sequence, optical equipment such as periscopes have begun to be equipped.

However, this thicker tube is now confidential. For submarines, it is an equipment that greatly increases the combat capability of submarines. Its scientific name is called submarine snorkel.

Submarines sail on water using diesel engines and charge their own batteries at the same time, but underwater, they can only use batteries.

The power of the battery is precious. For example, if you sail at the highest speed, you can't even hold on for an hour.

Therefore, most of the time, submarines in this era sail on water and only dive underwater when they need to attack.

However, surface navigation is very dangerous, and ubiquitous anti-submarine aircraft are the biggest threat to submarines. In this way, it is very urgent to allow submarines to sail underwater and use diesel engines.

This device is the ventilator.

The diesel engine cannot sail underwater because it needs to inhale air and remove exhaust gas. Now, this pipe is here to do this work.

The interior of this pipe is divided into two halves, half inlet and half exhaust.

As long as the pipe can be opened outside, it can be exchanged with the outside air. In this way, although the submarine has not surfaced, it can start the diesel engine at the tail!

For the captain of a submarine, keeping his battery fully powered is what he hopes most, and at that time, he is most confident.

Since only a small snorkel was exposed, it was difficult to detect by surface ships.

There is a floating mechanism on the top of the air intake pipe, which is very similar to the floating ball principle in the toilet flush toilet.

When the mast is in water, the floating mechanism will automatically close and block the intake pipe, so that the outside sea water will not enter the submarine through the intake pipe. When the mast is exposed to the water surface, the floating mechanism can be opened by itself to make the intake pipe communicate with the outside world.

Now, as the pipe continues to rotate, soon, when it turns vertically, the top is exposed, the ventilator is automatically opened, and the sea water remaining in the intake pipe flows into the auxiliary ballast water tank on the boat.

"Start the diesel engine" Captain Prien shouted, staring at his eyes at the periscope in front, almost synchronizing. After the snorkel was out, the periscope also went out.

Behind, two 1400-horsepower diesel engines from Man Company made a low sound, which was quite familiar to the submarine soldiers.

After the diesel engine is started, the exhaust pressure blows out the sea water in the exhaust pipe. A faint blue smoke appears on the sea surface.

Historically, Germany only conducted experiments on this device in 1943 and installed it on a submarine produced in 1944. In fact, this technology appeared very early.

For example, the Dutch Navy conducted a series of tests as early as 1938. The submarines sailed at a depth of periscopes achieved underwater diesel engine propulsion using a single-tube ventilation system, giving the submarine almost theoretically unlimited underwater range.

Unfortunately, the German Navy did not notice the importance of this invention at first. In their eyes, this device was just a means to allow submarines to circulate air.

Now, this snorkel technology was proposed by Cialek at a meeting of naval equipment. After that, after the development of experts, it has developed and matured and has become a killer weapon for the German naval submarine force.

The diesel engine at the tail was rumbling, and the atmosphere ahead was very tense, and for the submarine soldiers, their attack was about to begin.

After lifting the periscope, Captain Prien immediately began to observe the sea surface. At this time, warships were catching fire, and thick smoke was rolling everywhere. Almost no valuable target was seen on the sea surface.

Leave something for me! Captain Prien was extremely depressed.

After a round, Captain Prien was still happy: "Left full rudder, prepare to attack!"

On the sea, a few kilometers away from the port, there is still a big guy left. Although the angle is wrong, Prien cannot identify the specific model and ship name of the other party, but it is definitely a large battleship!

The warship was emitting black smoke, but it had not sunk yet. Just let yourself send it to hell!

The left rudder is full! The water flow is stirred at the tail of the submarine, which belongs to the hunting of the submarine u-47. No, the massacre officially begins!
Chapter completed!