The fresh water brought by the rain to Pang Xuelin and Yao Bingxia barely lasted two more days.

But without food, their bodies were weakening day by day.

Unconsciously, the two had been floating at sea for nearly five days, and the fresh water stored in that light rain had been depleted, and Pang Xuelin knew that this time they were really in a desperate situation.

"I didn't expect that I didn't die in the earthquake or the flood, but in the end I would die of thirst and starvation......"

Pang Xuelin looked at the sky blankly and muttered to himself.

"Brother Xiaolin, you ...... What are you talking about? ”

"Nothing!"

"Brother Kobayashi, I feel ...... I feel like I can't hold on, I'm so hungry, I want to eat chicken legs, I want to eat lobster, I want to eat a lot...... Better...... Delicious ...... I'm sleepy, so sleepy......"

Pang Xuelin turned his head to look at Yao Bingxia, after five days of drifting on the sea, the girl's originally plump cheeks had become sunken, her hair was dry, and her bright eyes had lost their former luster.

Because of hypoglycemia, Yao Bingxia's consciousness also seemed to become blurred.

"Xiao Xia, let's sleep when you're sleepy, maybe in the next life, we won't have to be so difficult. Maybe you'll grow up to be a beautiful woman, enter one of the best dance schools in the country, and get on the big stage! ”

The corners of Yao Bingxia's mouth curled, she closed her eyelids, and a teardrop flowed down the corner of her eye.

Pang Xuelin turned his head, ready to close his eyes, waiting for the final moment to come.

Suddenly, he felt something strange in the corner of his eye.

Pang Xuelin hurriedly looked in the direction of the afterglow, and a small black dot seemed to appear in the sky.

Pang Xuelin blinked, as if he couldn't believe it.

After a while, the small black dot gradually grew larger, and the shape could be faintly discerned, as if it were a helicopter.

The helicopter was speeding in the direction where the two men were.

Pang Xuelin used his remaining strength to climb to the edge of the life-saving air sac to look.

The helicopter machine had gotten closer and closer, and the roar of the turboshaft engine could be faintly heard.

Pang Xuelin turned around and shook Yao Bingxia's body desperately.

"Xiao Xia, wake up, Xiao Xia can't sleep! Don't sleep! We are saved!! We are saved!! ”

……

Two days later, the Jiangcheng No. 1 engine, inside the hospital ward.

Pang Xuelin stood in front of the window, looking at the vast sea outside the window in a daze.

It had been two days since he was rescued, and he already had a preliminary understanding of this sudden disaster.

Due to the large-scale construction of planetary engines in the past three decades, there have been anomalies in the geological structure of the Eurasian plate, which carries the largest number of planetary engines, especially at the intersection of other plates, and large-scale earthquakes often occur.

Even some places that were not originally in the seismic zone were caused by large-scale strong earthquakes due to plate breaks.

The most serious of these earthquakes was the Great East Japan Earthquake that caused the sinking of the Honko land 20 years ago, which caused a super earthquake at the junction of the Eurasian plate and the Pacific plate due to the emergence of thousands of planetary engines weighing 500 million tons in a few decades.

The earthquake had a magnitude of nine, the highest magnitude ever, and a magnitude of 12, and it triggered a massive tsunami that killed and injured tens of millions.

And this time, it was also a magnitude 9 earthquake, and the epicenter was actually located in Jiangcheng, which was not in the earthquake zone.

According to experts, the three planetary engines near Jiangcheng caused the plates inside Jiangcheng to break and release stress on a large scale, which triggered the super earthquake.

One of the most serious consequences of the earthquake was the massive destruction of the dam along the coast of Jiangsu and Zhejiang, causing a massive influx of seawater, which was already dozens of meters above land, triggering a tsunami that wiped Jiangcheng and Shanghai, two first-tier cities, from the map.

Fortunately, most of the people in both Shanghai and Jiangcheng work on planetary engines, and the majority of people living in the cities are elderly and minors, and although the tsunami destroyed both metropolises, the casualties were far less than the Great East Japan Earthquake.

But it was unfortunate for Pang Xuelin, not only because he lost his grandparents, but he had just received the news that his parents had changed shifts with their colleagues in order to prepare for the holiday in a month to reunite with their families, and went to the city with Yao Bingxia's mother to buy gifts for him and Yao Bingxia, and then disappeared in this tsunami.

Pang Xuelin knows very well what it means to be missing in such a disaster.

In this world, he is alone again.

"No, maybe I still have relatives!"

Pang Xuelin's eyes turned to the pale Yao Bingxia on the hospital bed, she was still in a coma, because of hypoglycemic shock caused by long-term starvation, and finally fell into a coma, and the doctor rescued her for a whole day and night before she was out of danger.

Next, she will need a long time to recuperate before she can slowly recover her health.

……

"Xiao Pang, what are you thinking?"

At some point, a familiar voice came from behind him.

Pang Xuelin turned around and saw Gao Tianyi pushing Du Jiaxiang, who was in a wheelchair, into the ward.

Of the millions of people in Jiangcheng, only a few hundred survived.

Pang Xuelin was able to meet two old acquaintances in the list of survivors, which was a surprise.

On the day of the earthquake, Gao Tianyi and Du Jiaxiang were still in the laboratory, Du Jiaxiang was smashed by a falling experimental bench and broke his leg, but fortunately Gao Tianyi rescued him, and used the life-saving air bag he invented to escape the next tsunami.

The two were lucky, and the life-saving air bag happened to float near the Jiangcheng No. 1 engine, and they were rescued the next day, and Du Jiaxiang was also treated in time.

"It's nothing, Professor Du, your leg is okay."

Du Jiaxiang said: "It's okay, the injury is not serious, and it will be fine after a few months of cultivation." Xiao Pang, I heard the news of your parents, don't think too much, in this era, death may not be a relief. Now that the earth has not yet set sail, our planet is already full of holes, and we don't know how many tribulations are waiting for us after setting sail! ”

Pang Xuelin said: "Professor Du, don't worry, I'm fine!" ”

Du Jiaxiang nodded and said: "Just now, the superior leaders talked to me, this earthquake and tsunami, Jiang University except for me and Xiao Gao, and a small number of Jiang teachers and students who traveled on business trips for internships, almost all of them were wiped out, and then the superiors are ready to rebuild Jiang University in Jiangcheng No. 1 Dungeon, I am the leader of the preparatory team, I hope you can come over to help me." ”

Pang Xuelin was slightly stunned, frowned, and said, "Professor Du, thank you for your trust, but I'm just a high school student now......"

Du Jiaxiang said with a smile: "Xiao Pang, we have also cooperated for a long time, and we know each other well, at least in the academic field, I personally think that there is no problem at all for you to become a professor at Jiang University, not to mention, when the paper on carbon nanotubes is published, your status in this circle will rise sharply." Now we are in a special period, and for talents like you, the superiors will definitely be exceptionally promoted, so you don't have to worry about identity issues. ”

Seeing that Pang Xuelin was still hesitating, Du Jiaxiang looked at Yao Bingxia on the hospital bed and said: "You and your sister are just ordinary people now, after entering the dungeon, although you can be guaranteed to have no worries in life, the living conditions may not be as good as you imagined, but if you can get a position in the newly formed Jiang Damou, it will be different." At that time, with a breakthrough in the field of carbon nanotubes, Jiangda can directly nominate you to be elected to the scientific committee of Jiangcheng No. 1 Dungeon, and then whether it is personal treatment or overall living standards, it will become different from ordinary people. ”

Du Jiaxiang's last sentence completely moved Pang Xuelin.

Indeed, when I first thought about using the flying blade material, didn't I just want to attract attention and protect my loved ones?

Although the idea has become a joke now, Xiao Xia is still there.

"Okay, Professor Du, I promise you!"

Pang Xuelin said.

At this time, there was a sudden "bang" sound on the hospital bed, and Yao Bingxia, who had been asleep for two days, opened his eyes in a daze and looked at the people in the ward a little blankly.

Du Jiaxiang said: "Xiao Pang, since your sister has woken up, then I won't bother you, I'll leave first!" ”

As he spoke, Xiao Gao pushed Du Jiaxiang and turned around and walked out of the ward.

"Professor Du, walk slowly!"

Pang Xuelin turned his head, looked at Yao Bingxia, and smiled: "Xiao Xia, are you awake?" ”

"Brother Kobayashi!"

Yao Bingxia's eyes were like water, and a sweet smile bloomed on her face.

Pang Xuelin opened his mouth, hesitated for a moment, and said, "Xiao Xia, there is one thing, I hope you can be mentally prepared!" ”

Pang Xuelin finally told Yao Bingxia the news of her mother's disappearance, to Pang Xuelin's surprise, the little girl was not as fragile as he imagined, but she was silent for a day, and talked and laughed with Pang Xuelin again.

Later, Pang Xuelin learned that from childhood to adulthood, Yao Bingxia and her mother were together for no more than two months, and most of the time, her grandparents were taking care of her, so her relationship with her mother was limited, but the sudden death of her grandparents made her even more sad.

A week later, Yao Bingxia was successfully discharged from the hospital, and then took the elevator with Pang Xuelin and officially moved into the Jiangcheng dungeon.

Jiangcheng No. 1 underground city is located in the crust of up to 10 kilometers deep, the main structure of the underground city is divided into three floors, each floor is 50 meters high, covers an area of nearly four square kilometers, and can accommodate up to 400,000 people.

The uppermost floor is the industrial floor, which contains a variety of factories, which can provide various industrial products for the residents living in the dungeon, and at the same time provide various parts and components for planetary engines.

The middle layer is the living layer, which has a cultural and educational area, a commercial area, a residential area, a park area, a variety of living facilities, in order to ensure the quality of life, the walls of the dungeon are used ultra-high-resolution displays, the display screen appears blue sky and white clouds and a variety of surface city pictures, so as to avoid human beings because of a long time deep underground, claustrophobia.

The lowest floor is the agricultural layer, where the crops are produced in a fully enclosed factory, which can ensure the intake of carbohydrates, vegetables and fruits for all residents of the city.

As for all kinds of animal protein, mainly earthworms, cockroaches and bread worms, of course, pigs, cattle and mutton, all kinds of seafood and fish are not nothing, but in the dungeon, the breeding cost of these animals is extremely high, so the price is also high.

Usually these things are used by the coalition government to reward people who have made outstanding contributions in various fields.

Of course, if you have enough credit, you can also buy it in the market, but the price is extremely expensive, and if you eat a few meals a month, it is enough to bankrupt the average person.

Pang Xuelin naturally doesn't have to live such a life.

With Du Jiaxiang's recommendation, Pang Xuelin successfully entered the reconstruction team of Jiangcheng University.

And his treatment has skyrocketed.

In terms of residence, he obtained a three-bedroom apartment with an elegant environment and comfortable decoration in the cultural and educational district, compared with the cramped and cramped ordinary houses, Pang Xuelin's residence can be called a super mansion.

In addition, every month he can also get ten catties of pig, beef, mutton (the three can be matched at will), two catties of fish and meat, staple food and various vegetables and fruits are unlimited.

Even Yao Bingxia entered one of the best middle schools in the cultural and educational district.

With the successive participation of students from all over the world, Yao Bingxia's study life gradually returned to normal.

……

A month later, the journal Nature Nano published Pang Xuelin's paper on the use of chemical methods to prepare high-purity carbon nanotubes, which quickly attracted great attention from the global scientific community.

Subsequently, the Chinese Academy of Sciences sent a team of experts to Jiangcheng No. 1 Underground City to conduct a comprehensive evaluation and verification of Pang Xuelin's achievements.

In the end, this achievement was highly recognized by the team of experts, who believe that there is still a lot of potential for this technology to be tapped.

Although the coalition government was somewhat surprised by Pang Xuelin's age, it quickly made a decision to establish the Nanomaterials Research Center of Jiangcheng University, with Pang Xuelin as the director of the center, and sent top experts and scholars from all over the world to join Pang Xuelin's team.

If it were in the real world, with Pang Xuelin's qualifications, this situation would not have happened at all.

But in the Wandering Earth plane, in this era when all mankind is struggling to escape from the solar system, this strange scene has become the norm, and even the well-known experts and scholars who were sent to the Nano Center to join Pang Xuelin's team did not say anything.

This is an era where true achievers come first.

However, if you really want to talk about the level in the field of materials science, Pang Xuelin is definitely not as good as these scholars.

But who told him to already have a thesis?

The more than 30 papers on high-purity carbon nanotubes made him a real authority in this field.

Pang Xuelin's profound mathematical skills also make him more comfortable in the field of materials science.

Soon, everyone in the team found that according to the mathematical model provided by Pang Xuelin and the experimental route he provided, the fit was unexpectedly high, and the whole research process was unexpectedly smooth.

A year later, with the full support of the coalition government and scholars from all over the world, Pang Xuelin really developed the black box used to make flying blade materials in the three-body plane Wang Miao, and the flying blade materials also showed their true colors for the first time in the Wandering Earth plane.

Two years later, Pang Xuelin's team completed the research and development of ultra-high purity graphene materials and graphene aerogels, and Pang Xuelin's position in this field became more entrenched.

And in the past few years of working with these world's top scholars, Pang Xuelin's own learning has never stopped, so he has grown into a real expert in carbon nanomaterials.

……

The dungeon immigration work was completed ahead of schedule in Pang Xuelin's second year of entering the dungeon.

In the same year, the lunar exile project was launched.

In order to prevent the Earth from colliding with the Moon when it accelerates, humans have also built thousands of planetary engines on the surface of the Moon to push the Moon away from the Earth-Moon system.

That night, thousands of humans gathered on the surface to watch the moon set sail.

Pang Xuelin and Yao Bingxia also came to the ground, but Pang Xuelin had a special identity and received special treatment.

They came to a platform on the highest point that the Jiangcheng-1 planetary engine could climb to watch this world-famous moment.

Because of the adjustment of the earth's attitude, Jiangcheng was in the dark night at that time, and the bright moon hung in the cold night sky, which was a rare full moon night.

With the order of the engineering commander, the silver moon suddenly erupted with a dazzling blue light, pulling a long blue tail on the surface of the moon.

The sea under the stars also roared under this blue light, and because of the tidal force of the moon, such huge waves would last for days.

Over time, the Moon's presence in the starry sky will gradually fade, and this process will last for half a month, until the Moon completely becomes one of the stars in the night sky.

This natural satellite, which has been with the Earth for billions of years, has finally parted ways with the Earth.

"Brother Xiaolin, do you say that one day, we will also be separated like the earth and the moon?"

Sixteen-year-old Yao Bingxia suddenly raised his head and asked Pang Xuelin.

In the past two years, Yao Bingxia's body has begun a wonderful transformation, the immaturity on his face has gradually faded, and his chest has become bulging, showing his peerless appearance to Pang Xuelin bit by bit.

"Silly girl, what nonsense!"

Pang Xuelin flicked her head and skipped the topic.

He sighed in his heart that when he completed the task, he would have to leave this world sooner or later.

A month after the moon flew off the earth, the earth also began to set sail.

Countless planetary engines turned on at full power, and blue plasma rays pierced the night sky, propelling the massive planet on a 2,500-year slow expedition.

Humanity is on its way.