For the next period of time, the Sunset Project General Command focused all its energy on the rescue of the Sunset 6 ground spacecraft.

Pang Xuelin was also brought in for several discussions, but most of the rescue plans ultimately proved unviable.

According to the current state of technology, not to mention sending a spacecraft to rescue Sunset 6, it is also a super challenge for the scientific community to determine its position in the earth's core.

In a sense, it is unlikely that Sunset VI will be pinpointed deep in the Earth's core until a major breakthrough in fundamental physics has been made.

After all, Sunset 6 is located deep in the Earth's core, surrounded by 3.6 million standard atmospheres and 6,000 degrees Celsius.

Coupled with the fact that it is surrounded by thick strata, traditional detection methods are basically useless.

According to the results of the discussions, the only technical route to determine the location of Sunset 6 is to use neutrinos to detect the position of Sunset 6.

But neutrinos only participate in very weak weak interactions and gravitational interactions, have the strongest penetrating power, and can pass through matter as thick as the diameter of the Earth, and only one out of 10 billion neutrinos will react with matter.

Therefore, in this world, although humans have been able to use neutrinos to communicate, if they want to use neutrinos to detect matter, they must have a deeper understanding of neutrinos.

And this requires a breakthrough in the field of basic science.

No one knows when such a breakthrough will be completed.

In the end, three months after Sunset 6 fell to the center of the earth, Shen Yuan coldly announced that he would abandon the rescue operation of Sunset 6 and instead focus on the next step of exploration and the Antarctic courtyard project.

Pang Xuelin didn't communicate much with Shen Yuan about rescuing Sunset Six.

On the one hand, he was just an ordinary doctoral student under Shen Yuan, who was soft-spoken and couldn't say much.

On the other hand, at the current state of technology, rescuing Sunset Six is not realistic.

He has another very important job to do.

Normally, he still has two years to graduate, so his dissertation can be postponed by two years, but he can't wait that long.

In his future academic career, he is not thinking about doing geophysical research, what he really wants to do is how to use the huge resources stirred up by Shen Yuan to complete the construction of the Earth Cannon, and on this basis, find a way to rescue Sunset Six.

The best way is to gain Shen Yuan's trust as soon as possible, so that Pang Xuelin can mobilize the maximum resources in the shortest possible time.

Therefore, during this time, Pang Xuelin has been writing the engineering technical plan and feasibility report on how to transform the Antarctic courtyard project into an earth cannon.

He believes that compared with the controversial Antarctic courtyard project, this report will be easier to impress Shen Yuan and other countries around the world.

After all, compared to the small corner of the South Pole of the earth, space carries the endless dreams of human beings.

It's just that in this era, although the price of space launch has dropped to tens of dollars per kilogram, the cost of space industrialization is still high. If the earth cannon can be manufactured on the basis of the Antarctic courtyard project, then human beings basically have the ability to immigrate to space on a large scale, which is a great attraction for all countries in the world and for the extremely ambitious Shen Yuan.

In the afternoon of that day, Pang Xuelin came to the command and control center of the Sunset Project with nearly 100 pages of papers written by himself.

Shen Yuan stood in front of the big screen and was talking to a girl on the screen.

The girl wore a spacesuit with an unusually developed thermal insulation system, a pencil floated silently in front of her, and she looked particularly petite and weak in front of the camera.

Pang Xuelin knew that this was Shen Jing.

In the past few months, he and Shen Jing had met several times while discussing rescue operations.

He even reminded Shen Yuan to pay attention to the psychological state of the crew of Sunset Six.

But even that didn't stop the tragedy from happening.

In Sunset Six, the navigator couldn't bear the huge pressure, so he opened the hatch and chose to commit suicide. The captain died shortly after suffering severe burns while closing the hatch at a critical juncture.

At this time, the interior of this ground spacecraft. Only the poor girl was left alive.

If Pang Xuelin didn't intervene, she would probably stay in the small cabin of Sunset 6 in less than fifteen cubic meters for the rest of her life until she died of old age.

"Is there anything you want me to do?"

Shen Yuan frowned when he saw Pang Xuelin coming in.

He was a little disliked, Pang Xuelin disturbed the call between him and his daughter.

Pang Xuelin said: "Teacher, this is a paper I wrote about the Antarctic Courtyard Project, and I would like to ask you to correct it. ”

"You can leave it alone, I'll see later."

"Okay."

Pang Xuelin raised his head, smiled at the girl on the screen, and turned around and walked out of the hall.

Shen Yuan sighed slightly and asked, "Xiao Jing, there shouldn't be much communication energy left in Sunset Six." ”

Shen Jing replied: "The video call can last for about 30 days. The passive receiving system can persist until it can be continued, but unfortunately the transmission rate is too low and can only receive some text information. Don't worry, Dad, I'll take care of my work and life, the life cycle system in Sunset Six is intact and can function for decades, maybe we'll see each other again in the future. ”

Shen Yuan nodded and said, "Is there any place you want to go?" In two days I'll have someone take a pair of your eyes out, where you want to go, what to see, just mention, we will try to accommodate your request. ”

Shen Jing seemed to be a little entangled, thought for a while, and said, "Dad, there are a lot of places I want to go, I don't know how to choose, I'll tell you in a few days." ”

"Okay, then we won't waste communication energy, let's get here here today."

Soon, the call was interrupted, and Shen Yuan sat down, leaning back on the recliner a little weakly, with a lonely expression on his face.

Obviously, his daughter is trapped underground, and his heart is not as calm as it seems on the surface.

Shen Yuan's gaze slid over the desktop somewhat unconsciously, and suddenly his eyes flashed, attracted by the title of the paper on the desktop.

"Earth Cannon Project?"

Shen Yuan muttered to himself, a little interested.

Soon, Shen Yuan picked up the paper written by Pang Xuelin and read it.

At this glance, I don't know how time flies.

Before you know it, the light outside dimmed.

Secretary Shen Yuan brought dinner to Shen Yuan, and then the dinner was completely cold, and Shen Yuan still didn't move.

The secretary knew Shen Yuan's character and didn't dare to disturb Shen Yuan.

Shen Yuan's gaze was firmly focused on the paper written by Pang Xuelin, and his eyes became brighter and brighter.

After a long time, Shen Yuan closed the paper and muttered to himself: "Pang Xuelin, I didn't expect that there would be such a talent among my students......"