Vernal swore an oath.

Even though he had discovered many wonders of the civilized world, he had never been so deeply shocked by what he saw in front of him as he was today.

It was an open space the size of a football field, with a ceiling height of more than 100 zhang, and a number of square stone monuments like chess pieces on a chessboard, dotted with almost all the area of the entire open space. The mirror-like smooth surface and the knife-like edges and corners are like finely carved handicrafts.

What is amazing is not that this huge amount of work like terracotta warriors and horses, but that these billions of years have not been able to smooth its water chestnut, and it has not even been able to leave a single scratch on its body.

"God...... It's incredible. ”

With trembling steps, Professor Vernal passed the stunned Schultz and walked to the nearest stone monument. I saw that the old professor stretched out his trembling right hand, as if he was caressing a handicraft, and pressed his palm against the flat and smooth surface.

"It's a cemetery......"

With his hand on the nearest stele, Professor Vernal muttered to himself, "A cemetery of civilization...... It's hard to imagine how they have remained intact over all these long years, and by whom, and for what they have accomplished this miracle. ”

Finally coming back to his senses from his stunned spit, Schultz swallowed, stepped forward and stood next to Professor Vernal, looked at him and said in an inquiring tone.

“…… Cemetery? ”

"Yes."

Professor Vernal nodded, and after hesitating for a moment, he finally took out the multi-purpose shovel he had picked up earlier, and used all his strength to slash it hard.

After a few clanging sounds, the mirror-smooth stone finally could not resist the beating, and like broken tofu pieces, it split along the spot where the shovel had landed.

Knocking a piece of shard down the crack, Professor Vernal took it in his hand and examined it for a moment, then analyzed it carefully.

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

After a pause, he continued.

"What surprised me was not only these, but also the fact that this 'craft' made of high-strength alloys was wrapped in some organic detritus containing calcium carbonate minerals."

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

Taking a deep breath, Professor Vernal carefully placed the collected sample into the sample bag he carried with him, labeling it with information such as the location of the sample.

Looking at Professor Vernal, who made such an inference, Schultz's Adam's apple, which was full of shocked expressions on his face, moved slightly, and it took a long time before he said with difficulty.

"But...... Why did they send the coffin to the bottom of the sea several kilometers below? I remember you saying that billions of years ago, this place was supposed to be a sea. ”

It is not an easy task to carry out such a large project on the seabed.

Schultz is quite skeptical, with the current technology on Earth, it may not be possible to excavate such a large ruin at the bottom of the sea several kilometers below.

Professor Vernal nodded at Schultz's statement.

"That's right, I did say it, and the depth here is probably not small, like you said, at least a few kilometers or even tens or hundreds of kilometers."

Looking up at the wide grotto, and the square-shaped stones that were so neat that they could almost be measured with a ruler, he couldn't help frowning slightly and fell into deep thought.

"Maybe it's some special religious ceremony, maybe it's a sacrifice to that holy relic......"

"Or, it's not a cemetery."

"It's some kind of shelter?"

Vernal sensed something tricky.

There are just too many possible scenarios.

……

Just when Professor Vernal and Schultz were so shocked by what they found in front of them that they almost forgot the purpose of their trip, Lu Zhou, who was standing in an empty grotto, finally heard the voice from another civilization.

"I expected it would be at least a few centuries before I saw you again, but I didn't expect this day to come so soon," the voice said with a hint of approval and pleasure, "Congratulations, Chosen One, I believe you have brought the answers I need, right?" ”

"Yes," Lu Zhou nodded, "I've turned on the file transfer function, and if you can successfully receive this data, you should be able to see my proof." If there's something you don't understand, I can tell you about it. ”

"No, there are many ways to verify this, and this level of math is not difficult for us."

It's not that hard......

This world-class problem that has plagued him and his collaborators for a month is actually only "this level" in the eyes of this guy.

Thinking of this, Lu Zhou's face couldn't help but have a hint of crying and laughing.

Putting this inexplicable frustration aside for the time being, Lu Zhou took a deep breath, faced the empty grotto, and spoke in a clear voice.

"May I ask a question?"

"Just ask."

"Actually, it's not the only way to get here."

"Yes, but it's the fastest," the voice continued, with a hint of pleasure in his voice, "and there is not only one way to solve a problem, but also one of the joys of exploring to go through all the results and find a way out of the infinite possibilities." Of course, you can also be as opportunistic as you are now, allowing yourself to flow with the bubble of the four-dimensional space, but it has to be said that this requires not only courage and wisdom, but also a lot of risk. ”

Fun?

Lu Zhou's expression couldn't help but be a little strange.

At least he couldn't imagine any fun in it.

"I don't see the point of this test."

"It's an interesting question, and somebody asked me that a long, long time ago...... At that time, you were probably just cells. ”

The voice carried a little nostalgia and continued.

"The point of the test is to let the right person inherit what belongs to him."

"You know, civilization itself is an abstract concept, and giving to civilization is not enough to wrap up the gift and throw it on their home planet. We have to first select the right individuals through some special means, and then train the selected individuals to guide them to find and inherit the gifts that have been given, and only then can the gifts prepared for enlightenment be of their proper usefulness...... In fact, these things came to my mind later. ”

Lu Zhou: "So you're not an observer civilization. ”

"It's not...... But you ask, it looks like you've already seen them? ”

There was a hint of interest in the voice.

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

"It's a pleasure to meet you."

"Being able to face the void is not a common person's luck, although sometimes too good luck does not mean a good thing."

Lu Zhou didn't speak, but waited for the voice to continue.

"Well, now that you've met the Observer, I'm sure it's already told you about 'Legacy'. If it likes you, you may know more secrets than I do. ”

"Keep going."

"A gift from the Void is ahead."

"I believe that you are already standing here, and it should not be difficult to pass the last test."

Lu Zhou nodded.

"Of course."

With that, he took a step forward to 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, preventing his hand from moving forward.

Miraculously, however, he could clearly feel that there was nothing there.

It was as if it was not something that could be seen that stood in his way, but something akin to a law.

After pondering for a long time, a hint of interest suddenly appeared in Lu Zhou's eyes, and he muttered to himself thoughtfully.

“…… I didn't expect the crack in the four-dimensional space to look like this. ”

The voice carried a hint of approval.

"Yes, you're the first human to discover this."

"What about the Martians?"

"It took them 20,000 years."

"Twenty thousand years...... That's a long time. ”

"From the tribal period to the information age, they have almost come close to the truth, but unfortunately, the little ones are too conceited about their power, and this heavy truth eventually destroys them."

His hands continued to grope on the invisible wall, and Lu Zhou, who had an interested expression on his face, asked casually.

"What happened to them?"

"Disasters are man-made, and some of them are due to nature...... If you want to know, you will know when you pass through this barrier in front of you. Some materials are saved there, and if interested, you can take them away as a giveaway. ”

"That shouldn't be long."

Saying this, Lu Zhou took two steps back.

"What are you going to do?"

The voice carried a hint of curiosity, as if it was expecting Lu Zhou's next move.

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

"Do you need to ask?"

"Of course, it is to continue the unfinished work of those billions of years ago."

With that, he reached out and pressed a few buttons on the computer on his wrist.

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

The zigzag lines corresponded to the passages in the ruins, the things he had shown in the conference room earlier.

Although only a small part of the mapping of the relic tunnel has been completed, after all, the maximum exploration distance of the wire-controlled remote control vehicle operated by Fan Tong is only one kilometer, but it is enough for Lu Zhou.

As long as there is a certain law in the interference of these four-dimensional space debris in this three-dimensional space.

Even if you don't have a complete map, it doesn't matter.

There was a soft sound in the communication channel, and there was a hint of unconcealable approval in the voice.

“…… I'm underestimating you. ”

"But alas, you only have two hours."

"It's okay, it's just a topological geometry problem, although it's a little complicated......" Lu Zhou, who turned off the communication module and calmed down completely, took a deep breath and said softly, "But two hours is enough for me." ”

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