Vernal swears.

Even though he has discovered many miracles in the civilized world, he has never been shaken by his soul like everything he sees today.

It was an open area comparable to a football field. The ceiling height was about a hundred feet high. A square-shaped stone monument was like a chess piece on a chessboard. It was filled with almost all the area of ​​the entire open space. The smooth and flat surface like a mirror and the edges and corners cut out by the knife are like craftsmanship.

What is amazing is not that this huge amount of engineering is like a terracotta warrior, but that these billions of years have failed to smooth its diamond horns, and have not even been able to leave a trace of scratches on its body.

"God ... it's incredible."

With a trembling step forward, Professor Fernal passed the stunned Schultz to the nearest stone monument. I saw the old professor's trembling right hand, as if stroking a handicraft, and pressed his palm against the flat and smooth surface.

"This is a cemetery ..."

Putting his hands on a recent stone monument, Professor Fernal murmured to himself, "It is a cemetery belonging to civilization ... It is hard to imagine how they remain intact in these long years, who, and for What accomplishes this miracle. "

After finally returning from solitude, Schultz swallowed, stepped forward and stood next to Professor Fernal, looking at him in an inquiring tone.

"... cemetery?"

"Yes."

Professor Fernal nodded his head. After hesitating for a moment, he finally took out the multi-purpose **** that he had previously picked up, and gave the whole body a hard blow.

After a few dingling crunches, the mirror-like smooth stones finally couldn't withstand the knock, like broken tofu pieces, split apart along the shovel's fall point.

A piece of debris was knocked along the crack, and Professor Fernal took it in his hand for a moment to examine it carefully, and carefully analyzed it.

"At least three billion years ago, this piece of my hand should come from some alloy material. After billions of years of weathering, it has turned it into hematite, but the rare metals dispersed in the alloy have not Not completely oxidized, or even because the denser oxide layer is well-preserved, a special natural alloy with iron oxide as the main component was formed, which should also contain cadmium, nickel, and carbon, but the specific components need to be analyzed by professional equipment . "

After a pause, he continued.

"It wasn't just these that surprised me, but the" arts and crafts "made of high-strength alloy, covered with some organic debris containing calcium carbonate minerals."

"These things are like coffins ... No, to be precise, they are coffins."

Taking a deep breath, Professor Fernall carefully put the collected samples into a sample bag that he carried with him, and attached a label containing information such as the sampling location on it.

Watching Professor Fernall making such an inference, Schultz's throat with a shocked expression on his face moved slightly, and it was hard to say after a while.

"But ... why did they send the coffin to the bottom of the sea a few kilometers? I remember you said that it should be a sea billions of years ago."

It is not easy to carry out such a large project on the sea floor.

Schultz is quite skeptical that with the current technology on the earth, it may not be possible to dig such a huge relic under the ocean floor several kilometers below.

For Schultz's account, Professor Fernal nodded.

"Yes, I did say that, and the depth here is probably not small, as you said, it must be at least several kilometers or even tens or hundreds of kilometers."

He looked up at this wide grotto, and the square stones that were neatly arranged to be almost measurable with a ruler. He could not help but frown slightly and lost his thoughts.

"Maybe it's some kind of special religious ritual, maybe it's a sacrifice for that holy relic ..."

"Or, it's not really a cemetery here."

"But some kind of shelter?"

Vernal felt a little tricky.

There are too many possible situations.

...

Just as Professor Fernal and Schultz were so shocked by their immediate discovery that they almost forgot their purpose, they stood on a land boat in an empty grotto and finally heard the voice from another civilization.

"It was originally my expectation that it would take at least several centuries to see you again. I didn't expect this day to come so fast," said the voice with a little praise and joy, "Congratulations, Selected people, I believe you should have brought the answer I needed, right? "

"Yes," Lu Zhou nodded, "I have turned on the file transfer function. If you can successfully receive these data, you should see my certificate. If you do n’t understand anything, I can also say Give you."

"No, there are many ways to verify, not to mention that mathematical problems of this level are not difficult for us."

It's not that difficult.

This world-class problem that plagued him and his collaborators for a full month, in the eyes of this guy, is only "to this extent".

Thinking of this, Lu Zhou's face could not help but a look of crying and laughing.

Putting this inexplicable frustration aside, Lu Zhou took a deep breath, facing the empty cave, and said with a clear voice.

"May I ask a question?"

"go ahead."

"In fact, this is not the only way to get here."

"Yes, but this is the fastest," said the voice with a hint of joy, and continued. "There is not only one way to solve a problem. Iterate through all the results and pass the exhaustive in infinite possibilities. Finding a way out is also one of the joys of exploration. Of course, you can also speculate like this now and let yourself follow the bubbles of the four-dimensional space, but have to say that this requires more than courage and wisdom, but also has to bear a lot risks of."

pleasure?

Lu Zhou's expression couldn't help but be weird.

At least he couldn't think of any fun in it.

"I don't understand the significance of this test."

"This is a very interesting question. A long time ago, someone asked me this way ... you were probably cells at that time."

There was a bit of nostalgia in the voice, and he continued.

"The test is about getting the right person to inherit what belongs to him."

"You know, civilization itself is an abstract concept. Gifts that take civilization as an object are not just packing gifts. It is enough to throw them on their mother star. We have to go through some special ways to select from them. Appropriate individuals, and then cultivating the individuals who have been screened to guide them to find and inherit those gifts. Only in this case can the gifts prepared for enlightenment be used as they should be ... In fact, these things are what I thought of later. "

Lu Zhou: "So you are not an observer civilization."

"No ... but you ask, it seems you've seen them?"

The voice gave a sense of interest.

Hearing the change in tone, Lu Zhou nodded and said concisely.

"It's a pleasure to have met one side."

"Being able to face the void is not the luck that most people have, although sometimes good luck does not mean it is a good thing."

Lu Zhou did not speak, but waited for the voice to continue.

"Well, now that you've met the observer, presumably it has told you something about" heritage. "If it pleases you, maybe you know more secrets than I do."

"Go ahead."

"The gift from the void is just ahead."

"I believe you are already here. It should not be difficult to pass the last test."

Lu Zhou nodded.

"Of course."

Having said that, he stepped forward and reached the side of the invisible wall, and slowly extended his right hand towards it.

The moment his right hand finally touched the transparent wall, Lu Zhou could feel a clear resistance, which was preventing his hand from moving forward.

What was amazing, though, was that he could clearly feel that there was nothing there.

It was as if it was not something visible that blocked him, but something similar to a law.

After pondering for a long time, Lu Zhou's eyes suddenly appeared a look of interest, thoughtfully to himself.

"... I didn't expect the cracks in the four-dimensional space to grow like this."

There was a hint of approval in that voice.

"Yes, you are the first human to discover this."

"What about Martians?"

"They used 20,000 years."

"Twenty thousand years ... that's really long."

"From the tribal era to the information age, they are almost close to the truth, but unfortunately, those little guys are too arrogant about their own power, and this heavy truth eventually ruined them."

With both hands on the invisible wall, he continued groping, with Lu Zhou with an expression on his face, asking casually.

"What happened to them?"

"Disasters are artificial and partly due to nature ... if you want to know, you will naturally know when you pass the barrier in front of you. Some information is saved there. If you are interested, you can use it as a gift. They take away. "

"That shouldn't take long."

With that said, Lu Zhou took two steps back.

"What are you going to do?"

The voice was curious, as if looking forward to Lu Zhou's next move.

As if in response to this curiosity, Lu Zhou smiled lightly.

"Do you still need to ask?"

"Of course it is to continue the work unfinished by predecessors billions of years ago."

After all, he reached out and pressed a few buttons on the wrist-mounted computer.

Soon, lines of different colors were projected on the screen inside the mask in a three-dimensional form, and also reflected in Lu Zhou's pupils.

That zigzag line corresponds to the passage in the ruins, that is, the things he had previously shown in the conference room.

Although only a small part of the surveying and mapping of the ruined tunnel was completed, after all, the maximum exploration distance of the remote control car operated by Fan Tong was only one kilometer, but it was enough for Lu Zhou.

As long as the four-dimensional space debris interferes with this three-dimensional space, there is a certain law.

Even if you do n’t have a complete map.

A flick came from the communication channel, and there was a hint of concealment in that voice.

"... I look down on you."

"Unfortunately, you have only two hours."

"Anyway, it's just a topological and geometric problem, although it's a bit complicated ..." Turning off the communication module smoothly, Lu Zhou took a deep breath and calmly said, "But two hours is enough for me . "