Each of these saucer-shaped mechanical objects is about five meters in diameter, like upside-down plates.

Crafted entirely of pitch-black metal, with a small round door at the top, cameras and jets around it, it moves almost silently, and from a distance looks like some giant shellfish moving with the currents.

But apparently they weren't, but drove towards the wreckage of the fishing boat......

A total of three saucer-shaped submarines, soon approaching the floating wreckage of the ship, began to search for survivors, and once found, the small round door at the top opened, and someone came out of it, dragging the almost frozen survivors into the submarine.

Lu Ping read Chu Zixue's reorganized state, pointed to those submarines and asked silently in his heart: "Is that the submarine of the Crystal Palace?" ”

"That's right, B2 type dish submersible," Chu Zixue glanced at it, and nodded directly, "A small submersible that can be piloted by one person, with good performance, and a full load of up to 13 people...... I had one before. ”

Lupin breathed a sigh of relief.

He was still worried about how to save the survivors of these shipwrecks...... After all, although he can kill the undead, in this vast sea, he doesn't have the ability to drag a group of oil bottles to the nearby land!

Besides, he doesn't even know where the nearest land is!

The most likely rescue option is to enlist the help of the Crystal Palace. Lupin originally planned to see if these people were in danger of survival, and after ensuring that their survival was stable, he would go quietly to the Crystal Palace first, and then find a way to call someone to come to the sea to rescue...... But I didn't expect some Crystal Palace submersibles to pop up suddenly.

"You've already gone to the sea? Uh, why are there so many wrecks, it can't be that your giant ship sank......" Chu Zixue was still looking at the surrounding environment, and Mi Mi Hu Hu exclaimed, "If you can actually meet a patrol here, then the Crystal Palace should be near here!" ”

"Hmm...... It's okay, I'll wake you up when I get to the Crystal Palace. Lu Ping said silently, and then read the recombination state of the cow and horse, which made Chu Zixue fall into hibernation again.

"Thank you, thank you!" At this time, a saucer-shaped submarine also arrived at the wreck where Lupin was located, and the old man with a flare gun was grateful, and his expression was extremely exaggerated, "Old man, I am fortunate to be able to see the legendary Crystal Palace ...... in my three lives."

"You're welcome." What came out of the submarine was a sturdy man, touched his nose and said, "Let's go to the submarine, because some people have frozen, and some are seriously injured, and they have to be sent back to the city to be rescued...... Once you're out of danger, the Crystal Palace can take care of getting you back where you came. ”

"Good, good!" The old man danced and took the initiative to get into the submarine.

Lupin and Dr. Ge looked at each other.

The two followed closely behind and got in.

————

The B2 dish submersible is slowly descending.

Lupin noticed that many people were looking uncomfortable, and kept opening and closing their mouths, rubbing the roots of their ears...... And he actually experienced it himself, there was a pressure on the eardrum, like the tingling sensation in the ears when the plane landed from a high altitude!

"Don't worry, it's normal for the pressure to increase as you dive...... The rate at which we descend is strictly calculated, giving the human body sufficient time to adapt.

"As you dive, the gas molecules will gradually integrate into your blood, so that the internal and external pressures of the human body will always be balanced...... This is also known as 'saturation diving'! The limit of human saturation diving can reach 2,000 meters, and we are still far behind......"

"The air you breathe now is also specially made, and as you dive, the ordinary air in the cabin will gradually be replaced by a mixture of hydroxide and oxygen! This gas is enough to eliminate most of the symptoms of deep-sea anesthesia. ”

The pilot of the saucer-shaped submersible, the man in blue uniform, with a sturdy build, explained in a low voice, and no matter whether everyone understood it or not, he kept talking softly anyway.

But his gushing words and calm voice did make everyone feel a lot more at ease.

Lupin raised his eyebrows slightly, he had already done his homework on diving in advance in order to find the Crystal Palace, so he understood.

Human diving is not something that can dive infinitely with a compressed air cylinder...... Ordinary air is made up of 21% oxygen and 79% nitrogen, which are safe and harmless, but can become toxic in the deep sea!

Under the intense pressure of the deep sea, nitrogen causes a symptom called "drunken nitrogen", similar to drunkenness, in which a person becomes delirious, slow to react, and lose judgment...... Therefore, to breathe ordinary air, you should not dive deeper than 40 meters!

Helium and oxygen, which are special gases for deep-sea diving, are safer, less resistant to breathing, more comfortable, but also more expensive!

The mini compressed gas cylinder that Lu Ping bought for Ge Xu stored a large amount of hydrogen and oxygen mixture, and one gas cylinder alone cost 50,000 universal coins.

"What is Crystal Palace like?"

Lupin turned his head slightly and looked out through the plexiglass window, but all he could see was the blue water......

In the documentary of the past life, those colorful underwater creatures, schools of fish, strangely shaped jellyfish, huge sharks, and so on...... There was no trace at this time.

Beneath the surface of the sea, it seems to be a blue that you can't see as far as you can see.

As you dive, blue is gradually replaced by dark blue and black...... At one point, a small dark red glow appeared outside the window, as well as a large number of bubbles.

"That's ...... Submarine volcanoes? Lu Pingtong shrank in the hole.

There are many active volcanoes in the ocean, and flowing magma is not uncommon at the bottom of the sea, but Lu Ping remembered Chu Zixue's words and stared closely at those places where the dark red flashed.

The saucer didn't shy away at all, but swooped down on the magma.

There was an exclamation from the submersible, and everyone seemed to feel that the metal walls of the submersible were starting to get hot, and they were a little flustered.

Lupin's eyes didn't blink.

The moment the saucer touches the lava!

I actually wore it through.

Immediately after, the dark and hideous seabed, dark red magma, a large number of nitrous bubbles and sedimentary sulfur disappeared...... A bright blue seabed appears in front of you.

Everything just now turned out to be an illusion! Virtual projection technology, combined with an artificial heat source and a bubble making machine, created the scene of the active submarine volcano they had just seen.

The water temperature also decreases rapidly.

"We're here." The pilot, the man in the blue uniform, said with a smile, controlling the submersible to slowly approach the bottom of the sea.

Everyone's eyes widened and they leaned down the window to look down.

It's an amazing feeling...... It's as if they're guests in a hot air balloon, slowly descending from high in the sky towards a bustling city.

Buildings of different sizes and styles are fixed on the seabed by columns and arranged neatly; The undersea streets divide the city into many regular grids, and names such as "Scientific Research Street", "Jellyfish Street" and "Hero Road" can be seen on the crossroads...... Many pedestrians walked on the road in wetsuits, and various submersibles shuttled through the water above the building.

Lupin noted that almost all buildings are made of glass, but the difference between public and private homes is that the latter will cover the interior with a variety of colorful wallpaper to create an intimate space, while larger public buildings are often transparent, and many people without wetsuits can be seen inside, as if they were normal people on land.

Because of the large use of glass, it can be seen at a glance...... The whole city is sparkling and crystal clear.

"Crystal Palace...... A modern underwater city for mankind. Although Lu Ping had already heard Chu Zixue's description, he still gasped, and shock flashed in his eyes.