In later generations, there were many TV series and movies describing the spectacular world war and submarine warfare.

In order to attract the audience's attention and create a gripping tension, there is a scene where submarine soldiers cannot speak loudly on the submarine. As a result, a coin accidentally fell.

The most amazing sonar, the other party's sonar, actually heard whether it is facing down or facing down, which is definitely within the category of a magical drama.

Of course it is impossible to happen in this era. Even in later generations, sonar technology has become quite advanced, and it is impossible to reach this level.

Sonar technology has actually been available a long time ago, much earlier than radar. After all, sonar is just like receiving sound and amplifying sound. Simply put, isn’t this function implemented by the microphone?

However, if you want to use it on a submarine, this large microphone must be more refined, and at the same time, the amplification ability must be as powerful as possible.

For example, on this island submarine, it is equipped with the latest Type 93 hydrophone developed by the island nation. It is not a good thing. Now it is not called passive sonar, but a hydrophone. This name is more vivid than sonar.

As for its effect, some data say that you can only hear a distance of about one hundred meters? (The hero of East China is not sure, I hope someone who knows it will solve the problem.)

The sailor, Dog-Headed Liulang, had a big black headphone on his head, and the cathode ray tube was also erratic in front of him.

Suddenly, his brows frowned, and his face turned extremely pale: "Captain, I heard the sound of a deep water bomb falling into the water, well, there are still many!"

"Dive down, continue diving!" the ghost head slut ordered.

Now, they are driving underwater at a speed of 3 knots, which can allow precious electricity to be used for a longer period of time. The disadvantage is that they cannot quickly escape from this sea area.

And now, those anti-submarine deep bombs indicate that the opponent's interception troops have arrived!

Until now, the sluts are wondering why these Americans should be beaten up when they catch them? They have not had any conflicts with the Americans?

"Boom!" At this moment, an anti-submarine deep bomb exploded in the water above his head. The loud noise made the dog-headed Liulang immediately closed his eyes in pain and took off his ear cups with great force.

He felt his ears almost bleeding, and the rumbling sound was rumbling inside. This was definitely not a good experience. If you don’t believe it, what would it feel like if you amplify the sound of the shell explosion by a hundred times to the edge of your ear?

The sound is very loud. This bomb exploded near the submarine, and the sound waves hit the submarine's shell. For a cavity like a submarine, it has a cavity effect that amplifies the sound.

Hiding in a submarine will not feel safe.

"Dive, continue to dive!" The ghost head slut is still experienced. Although the explosion sound is terrible, it will not cause harm to the submarine.

It is not scary to hear an explosion. If you hear the sound of water under high pressure, it is scary, because it means that the submarine has broken a big hole!

Under his command, the submarine began to tilt.

The propeller at the tail rotates slowly, the submarine's hull is tilted, and the head end is moving towards the deeper sea.

"The depth is fixed to one hundred meters." The ghost head slapped.

His words made others tremble suddenly. The helmman, who was responsible for the operation, turned his head and looked at him with uneasy eyes.

This Haida 6b submarine was improved on the basis of Haida 6a. The improvement is to increase the dive depth and increase the range.

However, even if it is increased, there are limitations. For example, the design depth of this submarine is only 85 meters.

In the ocean, the pressure of the sea water is a terrible enemy. Every ten meters of diving, it is necessary to reduce the pressure pressure hull outside the submarine is limited. If the design dive depth exceeds, God knows what will happen.

"Execute the order!" said the slut.

As an old submarine soldier, he knew it at this time.

The design depth is the design depth, and the actual depth is the actual depth. There is always margin when designing.

What's even more terrifying is that his submarine cannot escape the terrible enemies on the water. Even if he sails at a speed of 3 knots, it will reach its limit at most 65 nautical miles.

Once the battery is exhausted, he needs to surface to charge the battery. Can he still run away?

This attack was so strange. He needed to persevere and to make moves in the top management. This is his hope for rescue.

Is there anything more important than increasing depth?

There is no other choice.

The submarine was slowly sinking, and the helmsman looked at the depth gauge and sweat kept oozing out of his back.

Finally, at 95 meters, he began to slowly level it, and finally, the submarine stabilized to a depth of 100 meters.

"It has dived to a hundred meters." said the helmman.

He picked up his headphones again, and Dog-headed Liulang continued to listen to the sound inside. At this time, the sound had become smaller.

"The deep bomb still exploded at a depth of twenty meters and had no effect on us." Dog-headed Liulang shouted.

If it is on a warship, it can be adjusted at any time when the warship encircles and suppresses submarines underwater, and can be changed at any time before the anti-submarine deep bomb falls into the water.

However, the deep bombs carried by the aircraft are not good. No pilot will do aerial acrobatics and walk to the wings or belly to readjust. When loading, it has been confirmed.

The small bomb on the wing has a fixed depth of twenty, while the large bomb under the belly has a fixed depth of one hundred.

This is tailor-made according to German submarines. If the German submarine is at the depth of the periscope, then twenty meters is just right. If the German submarines dive, their dive depth will be more than one hundred meters. If they are set to one hundred meters, they can still be blown up with the power of the big bomb.

When the first cover bombing was completed, all the planes rose to altitude, leaving only the seaplane, still observing.

If the submarine below is blown up, there will definitely be a louder explosion, with oil stains and corpses floating up, so that the results of the battle can be confirmed.

The Kingfisher reconnaissance plane flew around the sea and circled. Chris and Schroeder repeatedly observed the sea surface, but no abnormal situation occurred.

"That submarine must still be hiding below!" the bomber's chief aircraft shouted: "Prepare to drop a big bomb!"

The small bomb has been thrown, and now there are only big bombs left. Since nothing has been blown up, let’s just get on the big guy!
Chapter completed!