About 10 kilometers from the Crystal Palace, a B-2 saucer is hovering in a stretch of water.

Lu Xuejiang was observing the outside seabed through an electronic screen, and on a seat next to him, Yu Xin was about to change into a diving suit.

"Thank you so much for sending me so far away for seabed exploration." Yu Xin said with a smile, expressing his gratitude while doing the final examination of his scuba suit.

"You're welcome, I'll stop by." Lu Xuejiang waved his hand with a big grin, "Our patrol team also needs to patrol the nearby waters to check for potential dangers...... And that's where I'm in charge. ”

He didn't mention it, in fact, he changed posts with his colleagues, which led to the "way".

Yu Xin began to change his clothes next to him - taking off his trousers and long sleeves, putting on a stretch wetsuit that fits his body, and putting on fins, etc.

Although he was still wearing a vest and shorts during the whole process, Lu Xuejiang stared at the screen and had nothing to say: "This seabed doesn't look dangerous, there is no magma, and there is no undercurrent...... But then again, can your exploration team really tell what deposits are on the ocean floor with just the naked eye? I've always thought it was magical. ”

"Not all of them." Yu Xin said with a smile, "Only the most common mineral deposits, such as rutile, manganese nodules, and the like, can be identified at a glance, and the others still need to be collected and analyzed by instruments." ”

"I don't know what you're talking about." Lu Xuejiang scratched his head.

"Well, I'll show you." Yu Xin approached and pointed to the electronic screen, "This is like red agate, which is the rutile I just mentioned, which can be used to refine titanium...... Titanium, you know, titanium alloy has high hardness, light weight, excellent performance, and you may have used a lot of titanium alloy in this B-2 submersible.

"Walking on the Stars"

"These are sprinkled on the bottom of the sea like black briquettes, which are cobalt-rich manganese crusts, and manganese is needed for steelmaking, and this thing is also a mineral that the Crystal Palace needs very much......"

"Hey, there's still a moniterate stone?" Yu Xin said that he was also surprised, "Look, those orthogonocylindrical crystals, like those from a bouquet of colored diamonds, are monazite!" Rich in rare earth elements, it is used in the production of glass, ceramics and circuit boards...... I really didn't expect that the mineral resources on the bottom of this sea are so rich! ”

"Looks like you've got the job done this time." Lu Xuejiang secretly glanced at Yu Xin, who unconsciously squeezed to his side, and laughed in a low voice.

"Yes, it's a pity, it's not an energy vein! But these findings are also very good, and I will mark them all on the mineral map. Yu Xin's face was slightly red with excitement, and he sped up the progress of putting on the wetsuit.

After a short silence, Lu Xuejiang said again: "How did you memorize so much knowledge...... I'm okay with my workout, but these theoretical things give me a headache when I look at them! ”

"I don't know." Yu Xin shrugged, "It is said that when we arrived at the Crystal Palace, we all lost our memories and didn't remember the things before, but I always had a vague feeling that this knowledge was familiar?" I'm a pretty quick learner anyway. ”

"You must be smart." Lu Xuejiang shook his head, "Have you forgotten what we were dressed up at the time?" And since it was used as a tribute to the gifting ceremony, we must have been working for the poor who were struggling to feed themselves...... Even if you have memories of the past, you can't have such lofty knowledge. ”

"That's right." Yu Xin put on his diving suit and smiled at Lu Xuejiang, "Brother Lu, go back and talk wow, I'll go down first." ”

"Uh-huh, uh-huh, there you go." Lu Xuejiang hurriedly said, "But don't go too far, I'll patrol around here, and I'll come back to pick you up in about an hour!" ”

At the same time, the dish submersible is controlled, and the entire 180-degree flip is turned up, belly up.

The small round door, which was originally at the top, reached the foot.

Yu Xin nodded, quickly opened the small metal round door under his feet, and the whole person got out.

————

"It should be this way."

Lupin was in the middle of the water, swimming anxiously.

He has already turned into a smart dolphin form, and he swims very fast! It's just that due to the need to search carefully, he is shuttling back and forth in a general direction at the same time, like a needle and a thread, so the overall progress is not fast.

Lu Ping was in the Crystal Palace, and after contacting his mother Yu Xin to no avail, he contacted his father Lu Xuejiang on the spot.

But the latter also did not respond.

However, after many inquiries, Lupin finally found an insider in the patrol! The man said that Lu Xuejiang had changed posts with him, replaced him, and went to patrol 20 degrees east-north.

Lupin followed the only clue and went straight to it.

Although the Crystal Palace was urgently closed, at this time, Lupin was worried about the safety of the two, so where would he care about this kind of death rule...... Anyway, the Crystal Palace doesn't have any walls, only a virtual barrier, and his fish-man form strength is close to the top of the captain-level level, and no one else can stop him from breaking out of the Crystal Palace.

As for whether he will be held accountable after he returns...... That will be after that.

Lupin searched for it all the way.

On the other side, after Yu Xin left the saucer-shaped submersible, the whole person also sank to the bottom of the sea and began to carefully observe various ores.

She held a small tool with one pointed end and one blunt end, knocking east and west, chiseling and occasionally putting some stone specimens into sealed bags and putting them in the backpack she carried with her.

She circles the ocean floor in a clockwise direction, gradually expanding the radius of exploration to ensure that nothing is missed.

At a certain moment, a bottomless crack suddenly appeared in front of me!

Yu Xin couldn't help but stop curiously.

She soon discovered that there were many sulfur-containing mineral rocks in the vicinity, as well as traces of zinc, uranium, odor, tin and other minerals...... These marks, in the depths of the cracks, seem to be more dense.

"Sulphur mineral rocks are usually formed by the cooling of seafloor magma, and magma may indeed carry many of the minerals out of the mantle...... Then this crack is likely to be a submarine volcanic crack many years ago. Yu Xin judged in his heart.

From various traces nearby, Yu Xin couldn't see any signs of an eruption recently, so he decided to go down and have a look.

Tying a safety rope to the largest rock nearby, and tying the other end to his waist, Yu Xin's whole body began to sink along the crack, and his figure was gradually swallowed up by the darkness.

However, she also has lighting on her diving mask, and quickly turns on the spotlights to illuminate everything nearby.

This illumination, Yu Xin was stunned.

Because in the depths of the cave...... Densely stacked with white spheres.

It looks, like super-large pearls, each one at least the size of a human head.

The pearls were even slightly translucent, and when Yu Xin looked closely, he saw that in the center of each pearl was a small fish or shrimp, or other sea creatures.

A large number of pearls are attached to the rock wall, like an eerie aquarium exhibit.

"Pearls are actually stones in the shellfish, but such a large pearl ...... How big does it have to be to generate shellfish? Yu Xin's thoughts spun quickly, "And how can there be so many giant pearls here...... Could it be that this seafloor fissure is home to a large colony of giant shellfish? ”

"Uh, what's that?" Yu Xin suddenly shrank his hole.

Slowly approaching, and when she saw the thing clearly, her hands and feet were cold for a moment.

That's the skulls of some people!

Bai Sensen, round and round, clinging to the rock wall like a pearl, at first glance it seems that the two are similar, but only to look closely find that it is wrong.

"No, we have to go." Yu Xin was furious, and hurriedly pulled the safety rope and swam up.

But when she swam out of the crack in the seabed, her body froze and she almost forgot to breathe.

Next to the seafloor fissure, on a relatively flat seabed......

The ten-meter-tall giant body was lying there leisurely, picking at his feet boredly with one hand and supporting his chin with the other...... His head is not a human head, but a large, closed shell, and the hand that appears to be supporting the chin is actually supporting the bottom of the shell.

"Has anyone ever told you that it's rude to go in when someone isn't home?" The Shell Giant didn't move, but his voice seemed to sound in Yu Xin's heart.