Aliens who usually choose places to live may be regarded as newly civilized primitives, but can the aliens who can easily dig caves in hard rock still be newly civilized primitives?

The formation of a chaotic stone belt can be immortalized in the flow of water and time to grind the boulders, but not a pile of soft sand, where to dig what is easy?

So the answer is definitely no!

Buffan was very sure of this conclusion.

The group that can easily break the hard rock technology will not be a barbarian tribe, and it must have its own technical heritage, but it is difficult to figure out what kind of technology.

For the first time, Bufan denied the technology of digging rock veins on the earth, such as diamond chainsaw technology and expanded plastic blasting technology, because both technologies will cause different traces, and with his engineer's vision, he can definitely judge it at the first time.

After that, he thought about different industrial technologies such as water sand jet cutting, high-temperature burning, laser cutting, and particle flow, and even thought of non-human technologies that he could think of, such as the legendary fossils of the so-called magical world into clay, such as the shaping of the Xiuzhen world......

When he thought he had figured out all the possibilities, what he found gave him an unexpected answer.

Three miles away from the grotto where he lived, there was an inconspicuous boulder.

The boulder is not high, only twenty or thirty meters, the shape of the rock mass is irregular, and the surface is also gray as if it is very weathered, in the rock belt, this type of guy is very common, but when Bufan passed by and hit it with a pickaxe, he found that the weathered surface of this boulder is just an illusion, and there is a lot of dust hanging on the surface attached to it, and when it is knocked slightly, it makes a crisp sound like steel.

The crisp sound was not like the kind of physical sound that stayed on the surface, but it carried a strange tremor, which may be possible to hide from the ignorant, but it is obviously impossible to hide from an engineering power binational expert like Bufan—there is a hollow inside this big stone!

Interested, Bufan went back and forth around the boulder, pondering three planetary cycles, before he found an entrance to the interior at a half-waist of the boulder.

Unlike the cave that was not closed at all before, there was no clue on the surface of this entrance, only a large depression in the palm of the rock wall, and when Bufan knocked it, he found that it was actually a mechanism that could be pressed!

Sweep away the dust, press and hold the mechanism, a pit of four or five square meters rumbled on the stone wall, and a whole depression turned out to be a sunken stone door, and the stone gate rumbled inward, and a pitch-black cave appeared.

Encountering this kind of rarity, how could Bufan, who would have been proficient in engineering, not see Hunting Xinxi?

Holding back the bold thought, he stayed outside for a long time, feeling that some of the filthy poisonous gases inside would also be dissipated, so Bu Fan carefully tested with a torch.

There is a semi-circular slide under the retreating stone door, and there is a round ball that acts as a roller under the stone door, which is within the scope of engineering understanding, and does not attract too much attention from Bufan, his attention is more on thinking - what kind of things can be hidden in such a hidden stone room?

Pits, flaps, thorns, crossbow walls, rolling stones...... All kinds of secret passages, Bu Fan has seen the whole thing in this grotto, if he doesn't know engineering, his physique is not bad, I'm afraid he can make him unbearable, even so, he has almost died or been trapped several times when he is reborn.

This seemingly simple grotto took him a half-planetary cycle to dismantle all the obstacles and enter the core secret chamber of this grotto.

It is said to be a secret room, but in fact it is just a small room, there are no extra stone benches, stone chairs and stone tables in the room, a circle of stone walls, the whole is cylindrical, not the common square, Bu Fan estimated the area here, it is only more than 20 square meters, which is equivalent to the size of an ordinary person's bedroom on the earth, but in this alien building, it can be regarded as extremely embarrassing.

Although there were no furnishings or anything like that, the secret room was not empty, and there were large piles of colored transparent stones, some shiny metal utensils, and large piles of metal balls of brilliant colors and sizes...... The blue-black walls are also not empty, with patterns outlined by thin bright yellow lines of unknown material, a style of all the petroglyphs found by Buvan.

However, unlike the petroglyphs in other places, the cave walls here are not depicted with themes of sacrifice, war, hunting, or farming, but abstract curves that people do not understand......

Bufan looked down at what was supposed to be a symbol of wealth on the ground, but he didn't touch it - not that he didn't want to, but he didn't dare, on the earth, in order to preserve the burial goods or sacrifices, there were many examples of ancient tribes smearing poison on treasures, who knows if aliens have such a habit?

Toxins on Earth can easily survive for thousands of years, let alone alien ones?

Therefore, no matter how much greed there is in his heart, he must suppress it, and Bu Fan will not dare to touch it at all, not to mention that he did not intend to find any treasure.

After the greed flashed in his heart, Bufan continued to investigate this core grotto with a little loss, could it be that the aliens built such a secret place just to hide some precious stones?

Anyway, Bufan didn't believe it in his heart.

With this suspicion, he held a torch and gently tapped along the abstract curves of the stone wall while inspecting the petroglyphs on the stone wall.

The four-armed alien has writing, which is somewhat similar to the cuneiform script of the ancient period on the earth, but Bufan is not an expert in language and writing, he can't understand it at all, he wants to speculate, and he can't start for a while.

There are also words in the petroglyphs on the walls of this room, but Bufan directly skipped it and ignored it, only focusing on the curve of the rock wall.

The lines on the petroglyphs are zigzag, and at each bend, there are always some large and small nodes, each of which is inlaid with gemstones of different colors...... Bu Fan suddenly realized in his heart, could this be a star map?

Then he drew the two torches that he had in reserve, lit them the same, and stuck them in the gap in the wall next to the door.

Under the bright firelight, the originally dim room suddenly brightened up, and the gems piled on the ground and the gems inlaid on the stone walls reflected different lights at the same time, and the bright yellow lines connected to it were no longer dim and difficult to see......

This is the star map!

Do aliens also have star worship, like the Mayans on Earth, or are they originally from another planet, but they have no lineage?

Bufan is also unknown.

But he can be sure that no matter how the aliens who once lived here came from, this thing is enough to prove that they are not barbarians!

Confirming his suspicion, it was only a small step forward for Bufan to explore the technology of the aliens digging the grotto.

He didn't stop exploring this chamber - it took a lot of effort to build a complex trap, but there was only one chamber at the core, and a bunch of precious gems and precious metals were piled up in the chamber with a star map, which was a bit contradictory to look at.

Either these gemstones are necessary materials for exploring astronomy, or ...... These precious stones are used as a shield to dispel thieves and the like......

Perhaps to prevent the collection in the bucket from rotting, or to trap the thieves who broke in, there was no ventilation hole in the bucket, and the torches could only burn for a while before going out.

In order to verify his suspicions, he went back and forth several times, and finally came across a hidden mechanism when he ventured to push the gems set in the cave wall.

Just like the entrance to this cave, after the gem was recessed, the cave wall resounded with a slight rumbling sound, and a one-meter-square stone niche was revealed in front of his eyes, and at the same time, six ventilation holes appeared at the top of the chamber, and six rays of light directly illuminated it.

Bufan was ecstatic, as he imagined, there were only two delicate objects on the stone niche, and one glance made it clear that they were not made by traditional hand, but by precision industrial products!

Both are made of the same material as the weapons previously discovered, and the overall appearance is similar to a wristband, but the details are very different, one has three tube-like protrusions and a button-like manipulator, and the other is rounded throughout, with only a rounded square plane and a groove of equal length......

This...... What is it?

Bufan's first feeling was that the former was a self-defense weapon, and the latter was some kind of exploration equipment or communication equipment.

But he didn't dare to test rashly, first, this kind of thing can't be encrypted by encryption, and it can't be tested in three or two clicks, and second, God knows if this thing has the ability to self-destruct?

At least he didn't dare to gamble casually.

But with these two things alone, he can take the speculation in his mind one step further...... The four-armed aliens had a glorious history, perhaps as alien visitors to this planet, or as former masters of this planet, but for unknown reasons they had a degraded civilization, war, natural disaster, or something else?

Bouvin couldn't continue, and he didn't want to.

Putting these two items on his arm as bracers, and closing all the mechanisms in the grotto, he went straight back to his lodgings.

In order not to indulge in his chaotic thoughts, Bufan has been busy with more than 20 planetary cycles, and finally has gained something, the reason why he is not ready to continue, fatigue is only one aspect, and it is his real idea to receive it when he sees it.

Next, he is ready to crack the harvest at the same time, by the way to recuperate, in the best state to welcome the awakening of the dead sea urchin, after all, whether or not to return to the earth, all depends on the dead sea urchin, in case there is no good cultivation, to that weird-tempered guy to take advantage of the danger, that is really to delay the big thing.

And...... He really had too many questions in his mind to communicate with that guy from the Dead Sea Urchin.