Coming to the bottom floor of the Tower of Babel again, Nebula and the others did not use the Tower of Babel's teleportation tower scroll to return the same way.

After Xingyun swept the first floor of the empty Tower of Babel with his spiritual power, he found a hidden wooden door in the center of the bottom floor of the Tower of Babel, because there was a layer of inscription in front of this wooden door, if it was not for adventurers who had reached level 30 or above or those who knew a little about the inscription, they would not have noticed anything unusual here.

After opening the wide wooden door, Nebula, Ryan, and Shinas walked down the stone staircase that extended down behind the wooden door

Ryan cautiously raised the Orb of Flame, illuminating the dark path on the basement level of the Tower of Babel.

The air here is extremely humid, and when you breathe, Nebula even feels that she is inhaling water vapor instead of air, and there are constant droplets of water dripping from the high stone walls.

When he walked up the stone staircase to the bottom of the basement level of the Tower of Babel, he saw the scene in front of him, and Nebula was in trouble.

The problem that Nebula is bothered by is not that there is no road, the way to the second basement level of the Tower of Babel naturally has, but the problem is

The problem is that the road is completely covered with water, which means that it is a complete waterway!

Nebula also knew that the place he was going to was called the Underwater World, but Nebula didn't know that he had to pass through the waterway to be so far away from the Underwater World.

There is no problem for himself and Ryan to take such a water route, the magic shield also has the effect of shielding the flow of water, and it only needs to consume some more mana, but Hiss Mentor can't, he is an ordinary person, how can he stay underwater for a long time without breathing?

Otherwise, it's better to go back the way you came, anyway, the activation teleportation scroll of the Tower of Babel's Magic Stone is not expensive, and you only need to make a flying ship to go from Sky City to Toy City, and you don't need to experience any danger at all.

Just as Nebula was hesitating what to choose, Shinas handed Nebula a bunch of pale blue, thumb-sized balls, and she said to Nebula, "This is the Air Ling, which contains air that can allow humans to breathe for about fifteen minutes, just pinch it, it will form a circular barrier around your head, and the surface of your body will also be covered with a thin film." And the air Ling has the effect of shielding the water flow, so you don't have to worry about what clothes get wet. ”

Nebula was surprised and asked Shinas, "Mentor Hiss, how could you have such a thing?" Did you prepare this in advance? ”

Shinas waved his hand and said to Nebula, "This was bought by Ryan in the Frozen Snow Free Market, and he bought a lot of them, which should be enough for us to reach the underwater world." ”

Air Ling can be counted as one of the specialties of the underwater world, so there are also some merchants who buy it to earn some difference.

However, the stupid merchant who bought Air Ling didn't know that Air Ling's only value could only be reflected underwater, except for the Treasure Island's Notellers and Thailand's floating market, which was slightly in demand, and Air Ling was difficult to sell in various other regions.

Nebula pinches and pops an air Ling according to the method described by Sinas, and the air Ling is emitting "Smack! After a loud sound, Air Ling formed a circular membrane barrier at the head of the nebula, and another membrane clinged to the body.

Nebula first tried it with his foot in the water, except for feeling the softness of the water, Nebula did not feel wet, and after lifting his foot again, Nebula touched the hem of his underwear under the blue magic robe, and sure enough, it was not wet!

After experimenting with Nebula, Ryan and Shinas also pinch an air spirit, and the three of them slowly continued to walk towards the second basement level of the Tower of Babel

★?????????????????? ★

"I remember that Mr. He Ke said that Master Xiuzi's research room is in the center of the second basement floor. But isn't there only thirty-seven level diving penguins here? Where exactly is the research room of Schutz? Nebula slowly descended with gravity as he looked around looking for Xiuz's laboratory.

Got it! It turned out that it was in this kind of place that he, like Mr. He Ke, borrowed the hidden space in the pillars of the Tower of Babel to open up his research room.

Underwater, Nebula had no way to transmit the voice to Ryan and Shinas, so Nebula could only make a few simple gestures, motioning for them to go to Xiuz's research room with him.

Ryan and Shinas nodded in agreement, and after Nebula used the special opening method that Hock had taught Nebula, Nebula opened the door to Xiuz's laboratory.

Different from the door of He Ke's laboratory, the door of Xiuzi's laboratory has an additional function to shield the flow of water, and after the three Nebula entered, not a drop of water was brought in.

"Who are you? How did you end up in my research room? A middle-aged man with white hair, who was tinkering with some strange experimental equipment, asked the three of them angrily.

Obviously, if the three Nebulas can't come up with any suitable reason, Xiuzi will just kick them out.

"Are you Master Xiuzi? I am a disciple of Master He Ke, called Glaar. Nebula, this is something he asked me to bring you, please accept it. Nebula hurriedly explained to Xiuzi so as not to be kicked out as a suspicious person, and after saying that, Nebula handed Xiuzi an ordinary Star Ring.

Xiuzi didn't take the three of them seriously at first, even if Nebula handed over a spatial ring, Xiuzi thought it was just an exchange of materials between He Ke and himself. The two people who lived in the Tower of Babel would occasionally visit the door when they had time, so they knew exactly what alchemy materials each other had, and the exchange of rare materials between them was not once or twice.

But when Xiuzi opened the spatial ring and saw the contents on it, he almost jumped with excitement.

The space ring is full of manuscript papers of He Ke's research results over the past 30 years, and the manuscript paper of the most important He Ke formula is also listed in it.

He Ke's meaning is actually very clear, He Ke's formula is only the last step away from being completed, and he hopes that Xiuzi can directly find the last key on the basis of He Ke's formula, even if he can't find it, Xiuzi can at least get a little hint.

He Ke has been stuck in the bottleneck of the He Ke formula for a long time, and if the old acquaintance Xiuzi can get a little inspiration and discuss it with himself, He Ke believes that he will definitely not be without gains.

Holding the manuscript paper full of writing in his hand, Xiuzi looked like he was looking at a glittering treasure, and his eyes almost burst into light

Until the air on Nebula, Ryan and Hiss was "Bang, Bang, Bang!" It was only after the explosion that Xiuzi realized that there were three more guests in his research room.

Xiuzi coughed twice in embarrassment, and asked Nebula kindly, "You are Glaar. Nebula? Hok's disciple of that old fellow? Hmm~~~ He Ke, is there anything else he has to say to me? ”

"Teacher He Ke asked me to tell you that it is best to give him an answer within three months, as if he has to do a very time-consuming thing after three months." Nebula honestly conveyed Hok's words to Xiuzi.

Nebula was going to go on with that, but they were heading to the underwater world, and they couldn't afford to delay too much time in a place like this.

"You're going to the underwater world, aren't you!? Is there anything else in the air? Give me fifty, and I'll make one good thing for each of you. Xiuzi said to the three of them with a smile.

Nebula wondered why Xiuzi knew their purpose, but Nebula didn't ask.

After asking Ryan to hand Xiuzi fifty air lings, Nebula was very confused about what Xiuzi was going to do, so Nebula kept staring at Xiuzi's every move, but Xingyun felt strange that he couldn't understand what Xiuzi was doing.

Probably seeing Nebula's puzzled look, Xiuzi asked Nebula while making props, "Don't you know what I'm doing?" ”

"Haha! I don't know! What I'm working on right now is an oxygen tank for the diving equipment of the Earth Defense Headquarters! As long as you put it on, you can breathe freely underwater, and the time is much longer than that of Air Rei, so after the oxygen is consumed, you can use it again as long as you inject oxygen into the oxygen cylinder through the oxygen cylinder sold by the Earth Defense Headquarters, doesn't it feel convenient? Xiuzi laughed as she spoke.

Xiuzi was originally a traditional alchemist, but since reading the books of the Earth Defense Headquarters and experiencing the related products, Xiuzi has called himself a great inventor.

The focus of his research has shifted from the almost impossible goal of inverse attribute magic to the invention of the earth's defense headquarters, and then through his own processing, the invention has become perfect, or even a new invention.

The oxygen tank was just a small invention sold by the Earth Defense Headquarters, and Xiuz made it very simple and improved it with some improvements.

As long as you carry the oxygen tank on your body, you can get an effect similar to that of the air Ling, and the duration is about four hours, which is much more convenient than the heavy oxygen cylinder made by the Earth Defense Headquarters.

And the oxygen tank also has a certain physical resistance and magic resistance, which means that after being attacked by underwater creatures, the oxygen tank will not be destroyed with a single blow, which is very useful for nebulae traveling underwater.

After a while, the three oxygen cylinders with the twin airbags were ready, and Nebula, Ryan, and Xinas carried them on their backs in a very curious way, and pressed the switch on the right airbag under the instructions of Xiuzi.

In an instant, a circular membrane barrier enveloped the heads of the three Nebulae, and a membrane for water insulation was also attached to the surface of their bodies.

Well~~~~ It's no different from Air Ling! And I have to carry this five-pound oxygen cylinder on my back, isn't it even more troublesome?

If it weren't for its defense, magic resistance, and duration, Nebula wouldn't be willing to carry something that looked a little silly