The last time I came underground, Mark took a simple track, and now, a huge city has been established underground, and it can't help but have an intricate transportation network, and a large number of long-term residents live, the ground has been seriously damaged since the appearance of the fire moon, and the special material mirror covers the entire ground, and the living environment on the surface may not be much better than that underground, and for ordinary people, the underground is more comfortable than a closed small environment.

In the deep underground passages, there are small towns, although they are small, there are clinics, schools and various civil facilities, and most of the residents are workers and technicians who make a living from drilling, and these people radiate out industries that can support others, such as service industries and restaurants.

The living environment of the underground city is not bad, the water, electricity, and network supply are no different from the ground, and the surrounding environment is slightly worse, but electronic products can already meet people's needs for entertainment, and even if you live in such an environment, you will not feel depressed.

The news that the civilization egg is about to be unearthed These underground towns are naturally the first to know, the explosive good news has disturbed the peaceful life of the town, more and more people are coming, hoping to take a look at the mysterious civilization egg, the town usually has hotels, generally for the traveling merchants or ground tourists living in the neighboring towns, the business is good but there has never been such a grand occasion when the whole town is full now, the underground residents are in a very complicated mood, years of hard work is finally coming to fruition, they are as excited as everyone else, However, once the civilization egg is removed, the task of super drilling will be over, and humanity will no longer need so many people to maintain the large machinery in the drilling, and will no longer continue to invest in the underground, most of the people in the underground towns will lose their economic resources, and the current prosperity is the last carnival of the underground towns.

Mark and his party were among them, and they settled in one of the deepest underground towns, intending to take a break and then go to watch the salvage of civilized eggs. There are still eight hours before the unearthed civilization eggs, the capture and exploration machine is slowly rising, everything is going on in an orderly manner, people have paid too much for this day, the process of salvaging civilization eggs has been rehearsed tens of thousands of times, and they have prepared emergency measures for any possible accidents.

The name of this town is called Southern Cross Town, it is the deepest settlement of human beings so far, there are 5,000 permanent residents here, it is a simple miner town, now the miners are no longer like in the old movies, waving manuscripts and sweating like rain, covered with coal ash in the narrow mine tunnel, their main job content is to operate a variety of large excavation machinery, all the dangerous work is done by drones, even so, some things have not changed, the people here are generous and heroic, There are five taverns in a small town, and children frolic in groups running through the streets, playing games that only they know about, not unlike a twentieth-century miners' town.

Resting in such a place for a while, it can also relieve the fatigue of the journey all the way, Sun Tan took Mark around the town, and introduced him to some living facilities that only underground residents use, when the two walked to a square, Sun Tan's face was a little wrong and proposed to go back to the hotel, but Mark saw something and walked a few steps forward.

The square was not large, but it was large enough for an underground town where space was extremely precious, and Mark saw a statue standing in the middle of the square from a distance, and below it was a square platform with a standing woman carved on it.

When he got closer, Mark saw the woman's appearance clearly, and he froze in place, he knew this person, and it was a person with whom he had known him well, this was a memorial statue, standing in the nearest town to the center of the earth.

"Nina?" Mark couldn't believe his eyes, he hadn't heard from her since he woke up, Mark hadn't thought of her, but Sun Tan said that the lifespan of humans had been greatly improved, and he originally thought that she was still working in the sixth district and was alive and well......

"yes, I didn't want to tell you so soon...... The matter of your uncle and aunt has already hit you hard, and I want you to slow down. Sun Tan walked from behind him with a sad face.

The three of them are best friends all the way from the moon, facing danger together, sharing weal and bene, they are comrades-in-arms who can entrust their backs to each other, and they are the most trustworthy people in each other, and without others saying it, Sun Tan can also see that there is another layer of bond between Mark and Nina, but Mark and Nina have not broken each other, he is caught in the middle but can see it clearly, if Mark does not have an accident, in a few years, the two may come together hand in hand...... It's a pity that they will never be able to convey this intention to each other.

Mark sighed, didn't get too excited, just shook his head and said, "I'm fine, since I chose to hibernate, I should also be ready for this...... How could she ......" He looked at the inscription on the pedestal of the memorial statue, which read: Nina Esmeta, this statue commemorates her dedication to exploring the unknown, she did not leave us, but was quietly somewhere in the world, waiting for us to take her home in the future.

"Mysterious Hollow." Sun Tan and Mark talked about the accident that year: "In the second Tianhua year after your hibernation, human society has completed reconstruction, economic and political stability has been restored, development has ushered in the first leap period, the progress of super drilling has been greatly accelerated, and the mysterious hollow research plan that was previously shelved and closed has been restarted again, and the leader of the plan is Nina, in fact, this plan can be restarted all thanks to her, she talked to me about this problem at that time......"

"After I hibernated...... Does she come to you often? ”

"Yes, she's sad, since you left, she seems to be a different person, she has a less smile, her personality is much colder, she is more and more resistant to contact with other people, your things are really her, she spends all her time at work every day to numb herself, but she is still a very good scholar, she has made great achievements in the past few years, do you remember? You all experienced the wonderful power of the Mystic Void during that super drilling crisis, and she has been studying the Mystic Cavity ever since, and that's because of that idea...... That's when the tragedy that followed......"