Potomac River at night

This famous river that divides the north and south of the United States and passes through the Washington D.C., even in this quiet night, you can vaguely hear the roar of the water. The endless river water and the dim light perfectly cover everything under the water surface, and it is impossible to determine what is in the dark water.

And on the bank of this long river, there were two dim figures, followed by a faint light, carefully observing the abnormalities around.

"That... the final fortress of the 'Human Ark' is built underwater?" A subtle girlish voice came from a corner covered by shadows.

"Well... it should be to avoid various explorations. There are many undercurrents under this unknown water. Coupled with some complex ecological environments under the water, it can almost be said that a layer of natural protection can block many troublesome detection equipment from outside."

"Well... Then how can we get in? That fortress seems to be built at the bottom of the river?" The girl raised her own question.

"It's actually very simple... Just hold my hand." The boy's figure vaguely vibrated in the air, and then calmed down. But the girl next to her voice was a little panicked:

"Hey? Why... I have to hold hands! This has nothing to do with sneaking in, right?" The girl's voice was a little louder, but it was still covered by the sound of water.

"...It's just that I can't use it easily... Otherwise, I can't change a diving suit, right? It's very inconvenient to move like that?" The air around the boy kept fluttering at a strange frequency, and the boy's voice also came.

"Hey... wait! Classmate Xingchuan stops pulling me..." The figures of the girl and the boy appeared from the shadows, but then disappeared without a trace, but the traces of objects moving and crushing the past can still be seen from the ground.

At this time, Chen was standing in a gentle place, pulling Heizi beside him to walk. However, Heizi didn't understand Chen's unexpected actions, but in the end he chose to believe Chen's approach.

The two of them walked from land to the water step by step. Just as Heizi thought that his clothes were going to get wet and wanted to ask, he was surprised:

"Hey? It seems that I didn't touch the water?" Kuroko said, feeling her feet that were already immersed in the water but could not feel the feeling of being soaked in the water.

"Of course... don't delay too long... I haven't tried this method for a long time... I'll sneak into that fortress as soon as possible." Chen looked at the Kuroko who felt different feelings curiously, and was so urged.

"Yeah!" Heizi just responded, and then he plopped into the water, of course he was pulled into the water by Chen.

"Hey hey! Xingchuan classmate! What are you doing?" Heiko complained, and Chen just used his extraordinary vision and perception to explore the surroundings, answering while observing:

"Just come down quickly... Don't worry about drowning anyway. By the way, can Shirai swim?" Chen suddenly asked this question.

"That's right... I don't feel like I was immersed in water before... Of course! How could this simple basic skill stump me?" Kuroko complained with some dissatisfaction.

"That's good. When Shirai leaves first, I may not be able to leave together. Shirai has to swim up by himself." Chen slightly determined his direction in the water, determined a little, and then said to Kuroko.

"Hey? Aren't classmate Xingchuan leaving together?" Kuroko asked with his head tilted, but at this time it was pitch black under the water, and the expression of the boy beside him could not be seen at all. Kuroko could only feel his presence by holding the boy's palm.

It's really dark here... I've never felt so lonely and helpless... But... But I really don't want to be alone? The girl subconsciously clasped Chen's palm, and then suddenly felt something, and she was a little panicked and wanted to take it back.

"Don't move around. The range of air film I made can be maintained is limited. If Shirai is far away, I will not be able to maintain it." The boy seriously reminded that in the darkness, the boy can only be regarded as plain words, but it is particularly important, enough to make people feel at ease in this dark environment.

"What is this... of Xingchuan's ability?" Kuroko gradually calmed down and asked curiously while falling down to the bottom of the river with Chen.

"Well... it can actually be understood as I forcibly extracting the air from the nearby river water, and then forming a balanced situation beside us, so we are actually in the air rather than in the water." Chen explained casually, but in fact he was trying his best to determine the specific direction of a certain building.

"Woo... It looks so convenient... Can Xingchuan ignore these environments directly?" Kuroko said in surprise.

"It's not convenient... I have to be more attentive to maintain the stability of this thing. Instead of being so troublesome, it's better to use a diving suit..." Chen's voice sounded quietly.

"In fact, if you move coordinates like Kazuki like Kazuki, you may not be able to move yourself directly into the fortress, but there is a great chance of stuffing your body into the alloy protective wall... If you don't master the ability to move space well, you will have problems..." Chen said some of his guesses, and then led the Kuroko through many undercurrent areas and finally landed at the bottom of the river.

"Yugaki's ability is much stronger than mine... The mass and distance of the objects I can move are much lower than her..." Kuroko may have thought of Yuugaki, who is also a space-powered person, and said with some frustration.

"This cannot be said like this... If I look at it alone, Akihi Yuki will make mistakes when using it, and even have to rely on things like flashlights to accurately locate it. There are many defects and he cannot master the ability to move remotely. It is not as good as Shirai's ability to move accurately." Chen said with some disagreement.

"Eh?" Kuroko was stunned for a moment, and then didn't know what to say.

"The ability does not necessarily need to be the strongest and most invincible, but it is the one that suits you the most. For example, if you change your current ability to Akihi Yuki, what does Shirai think will happen?" Chen stopped moving, and Kuroko vaguely felt that he should have turned his head and asked him.

"Well... I guess I'm not very comfortable with it... I feel that her ability is inconvenient to use..." Kuroko thought about it and replied seriously.

"That's it. The strongest ability is not necessarily the best. Instead of having a long sword that cannot be mastered, it is better to have a dagger that can be used freely. Teacher Nagajuro once said this...", Tatsu seemed to be trapped in memory, and his voice broke for a moment.

"Ah... I just thought about something... Let's sneak in here first." Chen's voice remembered again, calling back the girl who was stunned by the side, and then the two of them walked towards a huge building hidden at the bottom of the river and completely wrapped in alloy metal plates in the direction of the water.

……………………

The Human Ark, known as the Doomsday Fortress, the ultimate scientific building of the last fortress, has protection capabilities above the nuclear bomb level and an unknown alloy shell that consumes huge funds to melt can reach nearly 100 meters in thickness. With its amazing strength, even if it is attacked by a few nuclear bombs on the front, it should be completely fine. Moreover, under this metal protective wall, there is a vacuum protection area, and a special energy protection layer, which is enough to withstand various invaders.

From the first day of building this ultimate fortress, no one has been able to break through its protection. Most of the lower-level intruders have returned empty-handed when they touch the outermost alloy protective layer, and no one has ever been able to break through the second or even third protection.

"It's really... Is it necessary to protect such strictness... I have to consume a lot of energy every day... What are the guys above doing? Are they going crazy? They actually asked us to turn on all the protective measures... Even the usual patrols have become troublesome..." A young soldier in a uniform kept complaining to his companions beside him.

"Well... maybe it's the master who is doing some confidential experiment? It's said that he got something amazing... I think those researchers are all studying all night..." The young man wearing the same uniform replied like this.

"Hey, maybe I'm studying things like immortality, right? It turns out that I've read a document that has not been destroyed... It is said that I'm doing this kind of immortality plan..." The soldier said carefully.

"How is it possible... life will die? Isn't this common sense? How can there be an eternal life?" The young man next to him complained.

"Well... it's just a legend anyway... This kind of thing is not credible!" When the soldier blew up and was about to say something else, he saw his companion beside him fixed on the spot, his body covered with white transparent ice crystals, and even his expression just now solidified in the ice cubes, but his last gaze was looking at a corner beside him.

The soldier turned his head in panic, but saw a young man with light blue eyes. His eyes did not contain any pity for life, just like looking at a dead person.

And this is the last scene that the soldier saw in his life. The thin boy pulled a tea-haired girl and looked around with a stern look. Even the two people who were frozen just now could not appear in the boy's eyes, as if they did not exist.
Chapter completed!