Otherworld Girl Development Guide

Since it uses sound waves as a means of communication, it is still within the rabbit's comprehension, and at least not as difficult to decipher as pheromones and spectral changes.

The pheromones exchanged between insects could be deadly to humans, since some pheromones still cannot be artificially synthesized!

Sound waves travel faster underwater than in air. However, we don't know much about the frequency of sound waves from the starfish civilization, since some sound wave frequencies are invisible to the human ear, such as the calls of whales.

Therefore, the submersible will release sound waves of different frequencies underwater in an attempt to find a frequency that can communicate with the starfish civilization. The system will record the sound waves released by the submersible in different frequency bands through onboard electronic equipment and record the other party's reaction. It would be even better if the starfish civilization's communication method could be deciphered.

Although the first contact between the two parties was not very "pleasant", the other party was a civilization capable of dominating the Abyss Sea and a survivor of an advanced civilization that had fought against a land civilization, so its mathematical ability would not be weak.

When two different civilizations come into contact, it's not just a contest of hard power, but also of soft power. Mathematics is the best way for two different civilizations to come into contact, because numbers don't lie; if you can't do it, you simply can't do it.

The unmanned underwater vehicle launched by the Qingluan fighter jet slowly fell towards the sea surface. When it was 50 meters away from the sea surface, the deceleration parachute at the tail opened, and it slowly drifted towards the sea surface, finally crashing into the sea with a splash.

As the submersible entered the water, its internal electronic components began to operate, and high-frequency sound waves spread out in all directions.

Sound waves are not only a means of communication, but can also be used as weapons. China is capable of using high-frequency sound wave weapons underwater, but using powerful torpedoes or even more lethal weapons in the deep sea is a matter to be considered only when all-out war breaks out.

(((Hello!)))

Sound waves travel much faster in water than in air, and the sound waves emitted by the unmanned underwater vehicle quickly spread outwards.

As the main base of the starfish civilization, Rabbit believed that the other party would definitely be able to hear them. As for whether they would respond to the communication, that would depend on the other party's attitude.

Chapter 2 Where is the Starfish Civilization?

(((Hello!)))

Are you there?

(I need to talk to you!)

Three torpedoes continuously released high-frequency sound waves underwater, hoping to make the starfish civilization hear them and then surface.

人耳可以听到的声波的频率是20Hz-20KHz，低于20Hz的称为次声波，高于20KHz的称为超声波。正常鲸的频率是15-25Hz，但是我们可以借助仪器将它的声音转换成我们可以听见的声音。

Submersibles can not only emit ultrasonic waves underwater, but also listen to any infrasound and ultrasonic waves underwater...

Time ticked by, but there was still no reaction from below the surface; not even the sea creatures that usually made noise surfaced...

However, if the starfish civilization continues to remain hidden on the seabed, then there's really not much that China can do.

"Eagle's Nest...Eagle's Nest...This is Chongming. The starfish isn't responding to the ultrasonic waves...Repeat..."

The bird with the name Chongming, which was monitoring from the sky, reported what was happening here back to Pengkun-1 and awaited instructions from Pengkun-1.

Meanwhile, in the forward command center of Pengkun-1, members of the combat support team were holding an unusual meeting.

What are your thoughts on this matter?

On the LED screen, the situation in the deep sea area is broadcast in real time. In addition to the fact that the names are the same, low-orbit satellites and high-orbit staring satellites are also paying attention to the deep sea area.

"Should we knock on the door more forcefully?"

Perhaps because the ultrasonic waves emitted by the submersible were too gentle, the starfish civilization completely ignored them. After all, from a certain perspective, they were descendants of a higher civilization and might not want to respond to the calls from a "lower" civilization.

"Shall we drop N2-tipped depth charges...and see their reaction?"

After thinking about it, the big boss realized that the suggestion was a bit "radical." After all, throwing a "big firecracker" at someone's doorstep would be too sarcastic, so he decided to postpone the suggestion for the time being.

"This suggestion is a last resort..." the bigwig said softly.

"Is it not deep enough?" an expert thought for a moment and said, "The starfish is probably at a much deeper depth than we thought. Why don't we let the submersible continue to descend?"

Although ultrasound travels faster underwater than in air, it is still limited by the distance it can travel.

Those present looked at it and thought it made some sense, but an unmanned underwater vehicle that could dive to a sufficient depth was not something Chongming could carry.

"Let the Xirang base launch a large underwater vehicle."

"clear."

Soon, the instructions from Pengkun-1 were sent to the Xirang Base.

In the permanent fortifications of the Shangqiu military base and the Xirang forward base, special underground launch silos opened to both sides, revealing the "Fat Tiger" of the DF family. As the rocket engine ignited, Fat Tiger roared into the sky and then flew towards the Abyss Sea.

In situations like this, DF Express's delivery speed is still the fastest.

Propelled by the rocket engine, multiple Dongfeng rockets rapidly flew towards their designated coordinates... This launch of multiple Dongfeng rockets will reach the abyssal sea area and be distributed throughout the entire abyssal sea area.

There are two objectives: first, to expand the search area by spreading out the search network; and second, to locate the area where the starfish civilization exists or its activity range through multi-point positioning, thus preparing for another form of communication in the future!

After the massive projectile reached the target area, the warhead separated, the parachute opened, and it slowly fell towards the sea. At a distance of 10 meters from the sea surface, the warhead's fairing split open to the sides, revealing a large unmanned underwater vehicle with a diameter of 1200 mm inside.

Pfft!

When a large unmanned underwater vehicle (UUV) falls into the water, its internal modules activate upon sensing the seawater. The rear part of the UUV separates and automatically inflates, becoming a buoy that can float on the sea surface, while the separated front part quickly sinks to the seabed.

The LED lights on the top of the buoy flashed, indicating that it was working properly and was linked to Chongming, satellites, Xirang base, and even the Shangqiu command center via data link.

drop!drop!drop!

The large deep-sea submersible continued to sink into the deep sea and connected to a buoy on the sea surface via a 0.3mm thick fiber optic data cable, sending data to the buoy and then to the command system.

In the electronic sand table, the coverage area of ​​each large deep-sea submersible is displayed, followed by a long waiting period.

While releasing ultrasonic/infrasonic waves in stages, large deep-sea submersibles also listen to other underwater sounds when the sound-emitting device switches frequencies (shuts down).

If the Starfish Civilization Array were active after waking up, it would definitely leave some clues.

Tick-tock...tick-tock...time ticked by, half an hour passed, and there was no sound in the deep sea.

One hour...

Two hours...

When the time reached 1600, the entire abyss sea remained unusually calm, and even the sea monsters that usually appeared were nowhere to be seen.

The people in the Pengkun-1 command center exchanged glances and frowned slightly.

"I think the starfish civilization must have received the ultrasonic waves we sent..."

The experts present generally agreed on this point: the starfish civilization definitely received the call from humans, but they did not respond.

"Why aren't they answering?" the commander asked the experts in a low voice.

The commander valued the experts' advice, after all, the creature they were dealing with was not human.

After discussing the matter amongst themselves, the leading expert looked up at the commander and said:

"I don't know, because we and the starfish civilization don't belong to the same species, we don't know what they're thinking..." the expert said helplessly, adding that the conclusions drawn from human thinking are too one-sided.

"...However, based on our discussion, we believe that they are not unable to answer, but rather unwilling to answer, as they are worried about revealing their location."

In the vast abyss, the starfish civilization hides in the depths of the ocean, beyond human reach, which is like draping itself in a "fog of war," concealing itself in darkness.

For any species, survival is the primary requirement. In this dark, deep sea, exposure means being devoured by other prey.

The deep-sea submersible launched by the rabbit is essentially a large sonar transmitter. It can locate the starfish civilization by detecting the echoes, and then humanity will have a way to attack the discovered area!

Simply put, the starfish civilization did not believe in upright apes.

Chapter 3 Ancient Civilization Vehicles (Repaired, please click refresh in the upper right corner)

Simply put, it's a chain of suspicion; the starfish civilization didn't believe in upright apes!

"Is there any way to get the other side to speak?" the commander asked after thinking for a moment.

"It's difficult because we don't know the communication frequencies of the starfish civilization, or what each sound wave represents, so we can only rely on testing..."

"...We don't have any living individuals from the starfish civilization on hand, so we can only keep testing..."

This is rather unsolvable, since even math problems require certain conditions to be given in order to solve them.

"Then continue monitoring underwater until the submersible self-destructs."

That's right, these unmanned underwater vehicles are equipped with self-destruct mechanisms. China would never allow the Starfish Civilization to obtain its technological products, so whether it's the launched DF express or the underwater vehicles, their core components will self-destruct after use...

For the next few hours, the submersible continued to emit sound waves of various frequencies underwater, but the starfish civilization remained silent.

How much longer can the batteries inside our submarine last?

"Twenty-four hours..."

The commander nodded. This was also an achievement after the upgrade of the superconducting battery. In the past, this kind of underwater vehicle could only be used for half an hour at most, because emitting ultrasonic waves of different frequencies was too power-consuming!

What follows is a long wait, and we hope that the starfish civilization will give us some kind of response...

Meanwhile, in the special research institute at the Xirang base, experts are studying ancient artifacts salvaged from the abyss.

The vehicles of this ancient civilization are significantly different from those of the Starfish Civilization. The biggest difference lies in the outer shell material of the ancient civilization's creations.

Experts have offered many speculations about how the Starfish Civilization carried out metal smelting. After all, the two civilizations had different ways of survival, and before seeing the evidence, they could only offer some guesses.

The first possibility is through underwater volcanoes. However, due to the presence of seawater, the temperature of underwater volcanoes is limited, so this hypothesis is unlikely... But we cannot rule out the possibility that the starfish civilization had special technology. Simply put, it is possible, but not entirely possible.

The second method is to condense high-performance metals through chemical means. Human research on chemical metal smelting is limited, since most of the technology in human skill points is high-temperature metal smelting.

The third method is biosynthesis. Although it may sound exaggerated, organisms can synthesize metals. After all, who knows if there are special marine mammals that can synthesize metals, such as the scaly-footed snail that lives in the sea.

This amazing snail, the scaly-foot snail, not only has its abdomen covered with iron-containing scales, but its shell also has three layers. Moreover, the scaly-foot snail often lives near hydrothermal vents on the seabed, where the hydrothermal water contains abundant iron sulfur and ferrous sulfide.

When snails move around in this area, their shells are constantly rubbed against these substances, eventually forming a special alloy film that makes their shells exceptionally hard.

Fourth, the help of external objects, such as the goddess's most precious treasure.

......

Besides these conjectures, there are other conjectures. Once experts start thinking, there's nothing left for ordinary people to do.

"Prepare test records!"

Several experimenters spoke to the 4K high-definition quadcopter next to them. Upon receiving the command, the quadcopter took off and pointed its camera at the ancient artifact retrieved from the sea.

The two researchers first cleaned the outer shell of the ancient civilization's vehicle, removing the mud and sand adhering to it. After observing the vehicle around its perimeter, they compared it with the shape of the Starfish Civilization's aircraft projected by the quadcopter and came to the conclusion that the vehicle was not a creation of the Starfish Civilization.

Civilizations have different aesthetic views, so what one civilization creates may be considered ugly by another civilization. For example, the vehicles created by the Orcs may be seen as a pile of junk cobbled together by other civilizations, becoming a large self-propelled junk.

Or perhaps Minmatar's mobile space debris...

The details of the ancient civilization's creations are completely different from those of the Starfish Civilization. Even if the Starfish Civilization declined, some things would have survived.

"Records indicate that this vehicle is very likely a creation of the ancient civilization of Mingrui Star..."

"Understood~ Record complete~"