In later generations, there are many TV dramas and movies describing that spectacular world war, and movies about submarine warfare are endless.

In order to attract the attention of the audience and render the gripping tension, there was a section where the submarine soldiers could not speak loudly on the submarine. As a result, a coin was accidentally dropped.

And the most magical, the other party's sonar, actually heard whether it was facing down or down, which definitely belonged to the category of the drama.

In this era, it is of course impossible to happen, even in later generations, sonar technology is already quite advanced, it is impossible to reach this level.

Sonar technology has existed for a long time, much earlier than radar. After all, sonar is equivalent to receiving sound and amplifying sound. In short, isn't the microphone realized this function?

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

For example, the island country’s submarine is equipped with the latest Type 93 hydrophone developed by the island country. Yes, it’s not called a passive sonar, but a hydrophone. This name sounds more vivid than sonar.

As for its effect, some statistics say that only a distance of about 100 meters can be heard? (Huadong Zhixiong is not sure, I hope anyone who knows will greatly clarify.)

Sailor Goto Rokuro, with a **** headset on his head, the cathode ray tube in front of him is also erratic.

Suddenly, his brows were frowned, and his face became extremely pale: "Captain, I heard the sound of depth charges falling into the water, well, there are many more!"

"Dive, continue to dive!" Guitou commanded.

Now, they are driving underwater at a speed of 3 knots, so that the precious electricity can be used for a longer time, but the disadvantage is that they can't get out of the sea quickly.

And now, those anti-submarine deep bombs one by one indicate that the opponent's interception force has arrived!

Up to now, the ghosts are all wondering, why do these Americans want to catch themselves and beat them? Did you have any conflicts with the Americans?

"Boom!" At this moment, an anti-submarine deep bomb exploded in the water above his head. With this huge sound, Gouto Rokuro immediately closed his eyes in pain and took off his earmuffs forcefully.

He felt his ears almost bleed, and there was a rumbling inside. This is definitely not a good experience. Don't believe it, if you magnify the sound of a shell explosion by a hundred times to the edge of your ear, how would it feel?

The sound is very loud. This bomb exploded near the submarine. The sound slapped the shell of the submarine. For the cavity of the submarine, it has a cavity effect that amplifies the sound.

Hiding in a submarine will not feel safe.

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

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

Under his command, the submarine began to tilt.

The propeller at the tail turned slowly, and the hull of the submarine was tilted, and the fore end moved toward the deeper sea.

"Set the depth to one hundred meters." Guitou shouted.

His words made others tremble suddenly, and the helmsman in charge of the operation turned his head and looked at him with uneasy eyes.

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

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

In the ocean, sea pressure is a terrible enemy. Every ten meters down, the pressure must be reduced by about one atmosphere. The pressure hull outside the submarine is limited. If it exceeds the designed diving depth, God knows what will happen.

"Execute the order!" said the ghost.

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

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

What's more terrifying is that his submarine can't run the terrible enemies on the water, even if he sails at a speed of 3 knots, up to 65 nautical miles, which is the limit.

Once the battery is exhausted, he needs to surface to recharge the battery. Will he be able to run away at that time?

This attack is too strange. He needs to persist, and insist on taking action at the top level. This is his hope of rescue.

Is there anything more important than adding depth?

There is no other choice if you are stubborn.

The submarine was sinking slowly, and the helmsman was looking at the depth gauge, sweat constantly oozing from his back.

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

"I have dived to a hundred meters," said the helmsman.

He picked up his earphones again, and Gouto Rokuro continued to listen to the sound inside. At this time, the sound had become smaller.

"The deep bomb also exploded at a depth of 20 meters, and it has no effect on us." Goudou Liulang shouted.

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

However, the deep bombs carried by the plane will not work. No pilot will do aerial acrobatics, go to the wing or belly to readjust it, and it is determined when it is mounted.

The small bomb on the wing has a fixed depth of twenty, while the big bomb under the belly has a fixed depth of 100.

This is tailored to the German submarine~www.novelhall.com~ If the German submarine is at the depth of the periscope, then 20 meters is just right. If the German submarine dives, their The diving depth is more than one hundred meters. If it is set to one hundred meters, it can still be blown by the power of the big bomb.

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

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

The Kingfisher reconnaissance plane flew round and round the sea, and Chris and Schroeder repeatedly observed the sea, and there was no abnormality.

"That submarine must still be hiding underneath!" the bomber leader shouted: "Prepare to throw a big bomb!"

The small bombs have been thrown out, and now, there are only big bombs left. Since nothing has been exploded, just go to the big one!

In the sky, fearless bombers lined up again and swooped down.