Over time, after the ruins of the first town were discovered, probes soon discovered more settlements of intelligent civilizations on the ocean floor across the planet. After a brief summary, Zhou Xin and the others found that almost all of these settlements are distributed on the submarine plain with a water depth of 150 to 300 meters, covering an area of about a few hundred square kilometers, and the largest is no more than 1,000 square kilometers, which is relatively small. But compared to the small size of the city, Atlas found that the scientific and technological strength of the civilization that once existed on this planet should not be underestimated.

"Brother Captain, you see, this civilization generally uses lightweight composite materials in its construction." On this day, Atlas, who had roughly completed the survey of the first town, concluded to Zhou Xin, "The strength of this material is comparable to that of reinforced concrete, but the weight is only one-tenth of that of reinforced concrete, and its bending resistance is even more than three times that of reinforced concrete." Of course, we can now make materials with similar properties, but this proves that the civilization that once lived on this planet is probably not weaker than our current level of technology. ”

After saying that, the little girl continued, "Not only the materials used in the construction, but also other aspects of the investigation can confirm this inference. So far, the most puzzled part of the investigation is why this civilization has such a developed level of technology, but their settlements are generally small and scattered. In addition, according to the results of the restoration of the preserved building remains, the height of the buildings they built is generally not high, and the highest may only be about thirty or forty meters, which is obviously a bit unreasonable. ”

As she spoke, a restored image of the town appeared on the screen, and as she had just said, the whole town looked quite unremarkable, perhaps even the size of a county town when Zhou Xin left Earth. However, according to Atlas's findings, the town is already a medium-sized town on the planet.

Of course, compared to the towns on Earth, the small towns on this planet have their own unique features. The most obvious is the shape of the town itself, which, when viewed from above, is not an irregular polygon like most towns on Earth, but takes on the shape of a crescent moon. Not only the entire town, but most of the buildings in the town were built in the same crescent shape with a thick middle and thin sides. The concave surface of all the "crescents" almost points to the same center point, and this orientation forms the shape of the crescent moon in the town as a whole. Not only that, but all the buildings are not erected straight on the ground, but are clearly inclined towards the center point. In addition, Zhou Xin also noticed that the closer the building was to that imaginary center point, the higher its height would be. This makes the shape of the town similar to that of the buildings that make up the town, with a stepped upward trend from the long side to the short side. I don't know why, the civilization of this planet actually built their towns into such shapes.

"Maybe it's because of the environment on the planet." Looking at the restoration of the town in the picture, Zhou Xin said casually, "So they can only build a town of this scale, not even more than the scale, even the overall shape of the town looks so strange." ”

"Is it possible, you say, that this shape was originally intended to prevent the sudden rise of the sea?" From the beginning of Atlas's introduction, Spred was lost in thought, and only now did he speak, "From the materials of the building itself, this civilization has deliberately strengthened its ability to resist lateral forces." Looking at the shape of the building itself, don't you think this shape is quite suitable for weakening the impact of the sea? ”

After listening to Spred's words, Zhou Xin and Atlas seemed to be really reminded. The little girl on the screen suddenly showed a look of sudden realization, and even Zhou Xin fell into deep thought. After a few seconds, Zhou Xin said to himself thoughtfully: "If this is the reason, then the reason why the height of the buildings in the town is generally not high is also clear. Even if it is made of special materials and structures, if it is built too high, it will still be washed away by the raging sea. ”

As soon as the words fell, Atlas continued: "The probe has just been confirmed, and the shorter side of the whole town is indeed diagonally facing the direction of the deep sea. In this way, it is likely that Spred's guess is correct, and the town was designed with the sea in mind. If one can confirm that other towns built by that civilization have the same shape, then it can also be confirmed that there should have been a more obvious tidal phenomenon on that planet. ”

"However, after observing these days, it seems that we have not seen any obvious tidal phenomena on the planet." After listening to the little girl's analysis, Dart immediately objected, "Moreover, the cosmic environment around this planet does not seem to have the conditions to form violent tides." ”

"This—" Atlas couldn't find a suitable answer to Dart's doubts for a while, and a look of hesitation appeared on her face.

"There's something more important." After following Dart, Spred voiced his doubts, "Why did they end up drowning in the sea when the civilization that once existed on the planet had taken such precautions against tidal phenomena? Not to mention anything else, with our current level of technology, although we can't stop the rise of the sea, at least we can run away when we see the sea rise. But what about that civilization? Isn't it strange that we haven't even found a single survivor so far, not to mention running away? When this question was raised, it became even more difficult for the little girl to answer.

"Could it be that the civilization saw that the environment on this planet was no longer suitable for survival, so it simply chose to leave here?" Zhou Xin came up with an idea that he thought was very likely.

"Theoretically, that's a possibility." Atlas replied thoughtfully, "But can they really do it?" After saying this, she became relieved again, "Forget it, since it's still uncertain, then the family will continue to investigate." If that civilization really chooses to leave the planet, then they will definitely leave some traces on the planet......"