On a desert desert.

Two distant rovers converged.

Pushing the car door and jumping out, looking at Sun Wenzhe who was walking towards him, Han Kangyu, who was wearing a spacesuit, strode forward and asked with an anxious expression on his face.

"Did you find someone?"

With a solemn look written in his eyes, Sun Wenzhe shook his head.

"Nope. I've searched all the nearby generations, let alone a figure, and I haven't even seen the crack where he fell...... What about you? Any clues? ”

Hearing this bad news, the look on Han Kangyu's face couldn't help but be a little ugly.

"I don't have it on my side."

He searched almost every nook and cranny he could find, and even ventured a short distance towards the interior of the Hell's Gate Mountain Range, but the result was just like his teammate Sun Wenzhe said, let alone a human figure, and he didn't even see a slightly deeper crack.

Pessimism gradually grew out of his heart, and he now became more and more suspicious of whether the missing Fan Tong was still alive.

"It's not easy to do......"

Wiping a handful of sand stuck to the mask of the spacesuit, Sun Wenzhe looked at the mountains next to the two of them with some headaches, "It's still too unrealistic for us to want to turn this place over...... What's going on at headquarters? Didn't the captain apply for support? ”

"There is no support," shaking his head, Han Kangyu said in a heavy tone, "The ground command center requires us to use all the resources available at the scene to carry out a search and rescue of the missing people. Other than that, they said they would use the equipment already deployed on Mars to support us, but there was no better way to do it. ”

"Does that mean there is no support?" Sun Wenzhe sighed, "But it's also ...... The two-week voyage, even if it arrived, was mostly gone. ”

Equipment that has already been deployed on Mars......

In addition to a few probes dropped a long time ago, the usable equipment deployed on Mars, they suspect that only they are left with it.

Glancing at the time on the computer on his wrist with a solemn face, Han Kangyu's eyebrows couldn't help but have a trace of sadness.

It's been almost five hours.

With every minute that passes, the hope of survival is one point smaller.

However, just as the two were discussing how to proceed with the next rescue work, a very unnatural black spot suddenly appeared in the depths behind the rolling red sand.

Gradually, the black dot approached, revealing its outline in the eyes of the two men.

When they saw the outline clearly, the two who were still discussing the rescue work were dumbfounded.

I saw that the culprit, who had been looking for them for more than five hours, was riding an unmanned automatic investigation vehicle, driving slowly from their side.

"Thank you."

Gently patted the roof of the survey car, and jumped off the roof of the car with a dirty body and Fan Tong, who looked like he had gotten off the coal mine.

As if hearing this thanks, the camera on the top of the automatic reconnaissance car clicked humanely, and then made a 180-degree turn, continuing his previous mission, and heading away into the depths of the desert.

Seeing the unmanned reconnaissance vehicle that probably belonged to the Jinling Advanced Research Institute go away, Fan Tong then looked at his two stunned teammates, a trace of shame gradually appeared on his face, and he lowered his head.

"Sorry for worrying you."

"Do you know what I want to do now?" With his mouth muttering, Han Kangyu's eyes stared at him deadly, "I want to punch you now." ”

"I know I want to punch myself myself...... But now is not the time to say this," the ashamed expression on his face gradually became a little complicated, Fan Tong took a deep breath and continued with a wry smile, "I have important discoveries to report. ”

……

Mars research station.

In the activity room that was used as a makeshift conference room, Fan Tong, who had changed into civilian clothes, sat at the conference table with his four teammates, and told everything he had seen and heard in the underground world in a flat and straightforward way.

After listening to his story, everyone, including Captain Liang Youcheng, was stunned.

Martian civilization?

Relic?

It sounds as if they're actually living in a sci-fi blockbuster......

"What do you mean...... Did you see aliens underground? Stretching out his hand and pinching his eyebrows, Liang Youcheng sorted out his confused thoughts and continued, "And then in fact, it is not the same as the Martians, it comes from a third-party civilization outside the solar system, he has been alive since hundreds of millions of years ago, and told you that there was a civilization above the industrial age here?" ”

Sun Wenzhe, who had been silent, suddenly spoke.

"It is said that people can hallucinate in extreme environments."

"I swear it's not an illusion," Fan Tong continued in a serious tone, looking at his teammates with obvious disbelief on their faces, "We reported ourselves to each other, and he called himself a 'holy relic', and also mentioned the civilizations that once existed on this planet...... That is, the Martians. In fact, I did find evidence of the existence of a Martian civilization underground, and on the way to that place I passed a corridor with coffin-like objects on either side of the corridor. There's nothing wrong with it claiming to be a relic, but it does seem to me to be a funerary object. ”

Capturing a key message from his monologue, Sun Wenzhe immediately asked.

"What about the samples? You've found something so amazing, not to mention you didn't sample. ”

"It's in the sample bank, but if you want to extract the DNA from that thing, I think you'd better give up on it. Except for the barely recognizable traces of artificially carved lines of the row of 'coffins', most of the materials have basically weathered into biomass clastic rock. Although they have not been tested for isotopes, I can deduce from experience that the biomass detritus are probably older than the trilobite fossils. ”

Sun Wenzhe: "You have to try everything to know." ”

"Whatever you want, it's your profession anyway."

Looking at Fan Tong, who was leaning back in the chair, Liang Youcheng frowned.

"Let's not talk about the Martian civilization...... Are you sure you're underground, and you've seen another civilization alive? ”

"No, not seeing it to be exact, it was a very strange situation. I could feel that he was nearby, but maybe he was hiding, and I couldn't find where he was. He connected directly to my communication channels and even spoke standard Mandarin to me. By the way, I also ran into an invisible wall there, and in short, there are many things going on in the evil gate...... Don't look at me like that, I can swear by my academic reputation, it's definitely not an illusion! ”

"Forget it, I'll show you the evidence directly."

As he spoke, Fan Tong took the computer off his arm and threw it on the conference table.

Looking at the wrist-borne computer, Han Kangyu frowned and asked.

"What is this?"

"As I said earlier, we asked each other a question in a show of sincerity after a friendly question mark. I asked him who he was, and he threw a math problem in front of me...... That's it. ”

As he spoke, Fan Tong had already opened the information panel on the wrist-borne computer and read the text message.

The five people sitting at the conference table approached one after another.

Xiao Hong, an electrical engineer who stared at the math problem for a while, and had not spoken, continued with a strange expression, "It looks like a high math problem. ”

Hearing this, Sun Wenzhe, who was standing next to him, smiled bitterly.

“…… This isn't a high math problem. ”

Liang Youcheng immediately looked at him.

"Will you do it?"

At this moment, Han Kangyu suddenly interjected.

"If I'm not mistaken, this thing should be an ABC conjecture?"

"That's right, it's ABC's conjecture," looking at the four teammates with different expressions in the conference room, Sun Wenzhe nodded with a complicated expression, "Don't say it's a few of us laymen." ”

"It's back on Earth...... I'm afraid I can't find a single one that can solve this problem. ”