It is also true that although the people on the Nine Heavens Continent are powerful, there are still very few people who can build this kind of undersea city.

Otherwise, those countries with huge sea areas will also choose to build their cities in the underwater world.

The main thing is that they don't have the technology to allow the undersea city to have enough people to survive.

Because even if the strength reaches the martial arts, it is not easy to survive underwater for a long time.

Only when the strength reaches Wuzun, maybe it doesn't matter if you can take it in the water for a few months.

But the feeling of being wet all the time on the body is definitely unpleasant.

Humans are not fish and can't live without water, but they also don't like to stay in the water all the time.

Therefore, building a city in the middle of the sea, isolating a suitable dry environment, is the most important technology.

At least Lu Yu had read so many books on the Nine Heavens Continent, and there were no relevant records.

Lu Yu, who was already curious about the underwater world, now feels that this place is even more interesting.

Lu Yu vaguely remembered that in his previous life, it seemed that in his time, he also discovered an undersea city in a certain sea area of the earth.

The whole world was shocked at the time, and it was later confirmed that it was not technology on Earth.

Lu Yu suddenly felt that the people who built this city could not also be built by people from planets other than the Nine Heavens Continent, that is, the so-called aliens.

Lu Yu didn't dare to guarantee it now, because the Nine Heavens Continent was too huge, and even now, there were some places that had not been explored.

He also didn't know if the Great Butler already knew all the things on the Nine Heavens Continent, but since they had been staying on the continent where the Heavenly Martial Empire was located.

That showed that even if they explored the entire Nine Heavens Continent, those places that were mysterious to ordinary people were actually of no use to them at all.

"This place can't be built by my father, right?" Lu Yu suddenly had such an idea.

But in the end, Lu Yu still shook his head and threw this unlikely idea out of his mind.

Although his father Lu Chen gave him the feeling that he was very mysterious and powerful, it didn't mean that all the unrealistic things on the Nine Heavens Continent were related to his father!

For example, the base that Lu Yu discovered before, didn't it have nothing to do with his father?

And perhaps, this underground city was built by that person, and with the technology he has, it should be very simple to build such an undersea city!

Lu Yu, who didn't come up with a clue after thinking about it for a long time, didn't interrupt to continue thinking, and shifted his gaze to the surrounding buildings.

After that, Lu Yu's gaze had been wandering around the surrounding buildings, and suddenly he noticed something that was not quite right.

These buildings don't even have doors.

Yes, there is just no door.

When he found that these buildings had no doors, Lu Yu suddenly had a feeling that this undersea city was actually a child's toy building block, an unknown child, built with his toys, but the child's size was relatively large.

"Haha!"

Thinking of this, a huge giant child appeared in Lu Yu's mind, looking dumbfounded, holding building blocks in his hands, and building an undersea city with difficulty.

"It's absolutely unscientific. Lu Yu smiled self-deprecatingly.

Finally, when he entered the center of the undersea city, Lu Yu found a very peculiar building.

Based on the experience of the previous life, this structure should be called the Mage Tower.

That is, some Western fantasy style or games, where some top mages use retreats.

And this mage tower has a door.

It's just that this gate was built on a relatively high place, about five meters from the ground, and the size of the door was the same as the size of the doors of those buildings on the Nine Heavens Continent.

If there are indeed people living here, then the Divine Horse Giant that Lu Yu guessed just now is even more nonsense.

But in a world of martial artists, how could there be mages, at least Lu Yu had never heard of anything related.

"Go up and have a look!"

Without any hesitation, Lu Yu and his party flew to the door of the mage tower, and after making sure that there was indeed a large space inside, they walked in one after another.

"Wow, there are so many books here!"

Zhao Qianqian exclaimed.

"Don't touch ......" Lu Yu was worried that these books and bookshelves would turn into ashes as soon as they touched them, just like some of the plots, but his reminder was still too late, and Zhao Qianqian's hand had already touched a book.

But fortunately, there was no situation where it turned into ashes when touched, Zhao Qianqian easily picked up a book, ready to read it, and when she heard Lu Yu's words, she raised her head and looked at Lu Yu in confusion.

"It's okay, look at it!" Lu Yu said.

"Oh!" Zhao Qianqian pouted, not understanding what Lu Yu was doing, she lowered her head and opened the pages of the book to read, but without looking twice, she raised her head again depressedly and said, "What the hell is written on it, it is dense and I can't understand it at all!"

"Isn't it a mainland script?" Lu Yu walked to Zhao Qianqian's side curiously and looked down.

Sure enough, it was densely filled with things, but these things were neither the words on the Nine Heavens Continent, nor any words that Lu Yu had seen before, a bit of English, but they had the same feeling as Huaxia characters.

The others also walked curiously to the bookshelf, picked up a book each, and began to read it.

"Master, this is the universal text of the magical plane. Jiutian Zhi Brain suddenly took the initiative to speak.

The last time he inexplicably ignored himself, which made Lu Yu depressed for a long time, but he didn't expect this guy to talk again now.

Of course, Lu Yu would not be angry with an intelligent system, and now that she was using it, he asked excitedly, "Do you know the things above?"

"Yes, master, it's very simple, the books are all about magic, and I'm going to put the relevant words into your mind right now. ”

Jiutian Zhi's tone was very flat, and after saying these words to Lu Yu, he was silent again.

Two seconds later, Lu Yu felt a tingling pain in his brain, and felt that something had entered his mind, and when he looked up at the book in Zhao Qianqian's hand, he was already able to understand the things on it!

"This world is made up of countless elements, and the basic elements ......"

Lu Yu found that the book in Zhao Qianqian's hand was a brief introduction to the elements, and it should be regarded as the most important book for the initial cultivation of magicians.

The content of the book is also easy to understand, and even people who don't have a little common sense will understand what it says.

But Lu Yu was still puzzled, how could there be magic books here?

『Yan.Mo.Xuan.Xiao.Say.Net』