Sonar, a low-level civilization technology that uses ultrasonic technology, will be abandoned after civilization has developed to a certain level.

Like radar technology, sonar is also a detection technology, but one is mainly based on electromagnetic waves, and the other is mainly based on sound waves.

The sonar is mainly underwater acoustic wave technology, which uses sound wave technology to detect underwater objects, and analyzes the results through computer by means of sound wave reflection.

However, with the progress of civilization and the use of more and more science and technology, sonar and electromagnetic radar technology have been eliminated and abandoned.

However, every technology has a certain reason for its existence, and there are certain things that advanced cosmic civilization science and technology cannot do?

Ziying's 3D infinite wave technology relies on the fluctuations of the cosmic three-dimensional space, with the super dazzling infinite field power, directly sweeping everything in time and space.

But this can't scan the relics of that unknown civilization, so Xiao Yun can only think of one possibility.

That is, the relics of unknown civilizations exist in reality, and they are right in front of them, allowing them to see clearly.

The reason why you can see it, but can't touch it, is that this unknown civilization has mastered a mysterious special mechanical technology!

With this mysterious and special mechanical technology, this unknown civilization hides its relics in the past, or in the future.

The distorted space-time encountered earlier is a good proof that Ziying's three-dimensional infinite wave technology can detect everything in reality, but it cannot detect the past and the future.

"Xiao Yun boy! Why do you think that sonar, a low-level civilization technology, can detect the remains of an unknown civilization? ”

There was silence for a while, until Violet began to make sonar, Ziying still couldn't understand her understanding and couldn't help but ask.

Not to mention Ziying, at this time, Anne and Dale are both serious and curious, and Violet is even more purple and dim, looking forward to his answer.

"You have used all the science and technology, but you have not been able to detect the existence of the relics of the unknown civilization, but the relics of the unknown civilization are clear in front of us, don't you think it is strange?"

Xiao Yun did not answer Ziying's words directly, but asked a question instead.

"Humph! What's so strange! Maybe it's a space-time mirror image of the ruins of an unknown civilization, but it's not necessarily. ”

Ziying, who has a hard mouth, doesn't admit defeat, but her tone is a little weak.

"Space-time mirror! You also know the space-time mirror! So what else to ask? ”

Xiao Yun was disdainful, this guy was still so proud and proud, he answered and asked him.

At this moment, Ziying was stunned, and vaguely felt that something was wrong! But for a moment I couldn't remember that something was wrong.

"Xiao Yun! What do you mean........."

Anne's big blue eyes widened and she looked at him incredulously.

"Hmmm! That's how it should be! ”

Nodding, Xiao Yun is also guessing, there are no absolutes in everything, he just guesses, and in the end, it depends on whether the sonar made by Violet can work.

"What are you talking about? What should be like that? How, exactly? ”

Zi Ying was anxious, and she didn't know what they were talking about, which made her annoyed and angry.

"Don't roar! Xiao Yun means that the relics of an unknown civilization are likely to hide in the future or the past. ”

Violet was afraid that Zi Ying would be mad, so she hurriedly explained it to her.

"Lan Lan! There's no need to deal with a fool! They come from a highly developed civilization! Not for us hillbillies in small places to understand. ”

Seeing Zi Ying annoyed and angry, Xiao Yun said in a mocking tone.

"The future and the past!"

However, Zi Ying was in doubt and puzzled, and she didn't hear what Xiao Yun said at all.

"That's it! Sonar is made! This is your Aqua Blue Star's sonar system! Manufactured according to the most advanced sonar in your nuclear submarine above Aqua Blue. ”

A semi-circular sonar is displayed on the virtual screen, just like the semicircular device at the front and bottom of the ocean-going ships on the Aqua Blue.

"Let's get started! Let's see if we can detect the remains of an unknown civilization? ”

Xiao Yun took a deep breath, the Voyage Star River battleship had been trapped here for a long time, and they didn't have that much time to continue waiting.

"Understood! Start firing sonic waves! ”

Oh! Oh! Oh!

The sound waves vibrated one after another, and Xiao Yun and the others could hear it very clearly!

Zi Ying also came back to her senses, quietly watching Violet Control, staring at the virtual screen expectantly.

Oh! Oh! Oh!

Oh! Oh! Oh!

The sound grew louder and louder, as the Voyage Starship was trapped and some distance away from the ruins of an unknown civilization.

And this distance is a full four light-years, and Violet turns on the sonar sound waves to the maximum, and it will take a long time to return, accept and calculate.

"How long will it take! Your sonar technology doesn't work! Four light years away! You don't know how long it will take for your sonic waves to arrive and return! ”

After waiting quietly for a while, Zi Ying couldn't help but be annoyed, with Xiao Yun's sonar technology, it would obviously take a long time. And it may not be possible to detect the remnants of the unknown civilization.

Violet and Xiao Yun didn't make a sound, but Violet silently strengthened the sound wave! As a result, the battleship of the Voyage Star River is all sounding.

And the sound of the sound waves is getting louder and louder, that is, the entire control room hall is echoing with the sound of sound waves.

"Xiao Yun! It will take more than ten minutes for our sound waves to arrive, and this is still beyond the speed of light, plus our space technology guidance, otherwise I am afraid that our sound waves will never arrive. ”

Maybe it was because she saw Zi Ying's irritable scene, Violet hurriedly explained, although the explanation was to Xiao Yun, but it was for Zi Ying.

"Humph! Violet! You do not have to explain! We know very well! There is no need to say it. ”

Ji Yan'er glanced at the irritable Zi Ying next to her with disdain, and hurriedly interrupted Violet.

"I know! We've been waiting for so long, can't we wait a while? ”

Xiao Yun is also irritable, and there is a psychotic guy next to him who works against him every day! The mood can be good there.

"Humph! Am I just concerned about you? If you think it's too long, you can use my 3D infinite wave technology to guide the sonic technology, and you will soon be able to scan the entire unknown civilization ruins. ”

Perhaps because she felt that she was too impatient, Ziying snorted coldly and explained to them.

"That's it! Don't talk about it! Sonic has arrived at the ruins of an unknown civilization! Let's wait quietly for the sound waves to return! ”

Seeing that their relationship was so poor, Violet hurriedly stopped the quarrel that might break out next.

Time! The hall of the control room fell silent, Zi Ying was not talking, Xiao Yun ignored her, quietly looked at the golden ruined ruins, and began to fantasize about the civilization level of this unknown civilization, and what blows it had encountered.

Such a terrifying civilization has actually broken its core base, and it must have experienced a high-intensity high-level cosmic civilization war.

Only such a high-intensity war can make an incomparably terrible civilization suffer such a devastating blow.

I'm afraid that this unknown civilization is not the advanced cosmic civilization of the era where Zi Ying is located!

Moreover, this unknown civilization is hidden in it and has not been discovered, indicating that their ruins still exist in artificial intelligence.