Lin Xin sneaked back to save people.

The guy from Sawaki Fair crashed into the tide with a desire to die, and was washed away by the sea water on the spot, and people couldn't save it even if they wanted to.

And Belmode is only barely saved.

She had run out of oxygen and was almost unconscious.

"We have to get her to breathe oxygen quickly..."

Lin Xinyi's gaze became extremely solemn:

So, under this nearly ten meters of water, how to make Belmode breathe oxygen as soon as possible?

Mouth-to-mouth kissing and breathing?

That's a no-no.

Because of the high pressure of the seawater, the chest cavity of humans will be under considerable pressure when they breathe underwater.

The deeper the water, the greater the pressure and the more difficult it is to breathe.

The diving air cylinders are filled with high-pressure air, and only with the help of the right pressure is pressed into the lungs that humans can breathe easily underwater.

So, if you want to be mouth-to-mouth underwater like in the movie...

First of all, Lin Xinyi had to be like a pressurized blower, increasing the pressure to send air to the other party's mouth-

Of course, due to the existence of some unscientific factors, he can really do high-pressure blowing.

But he can't stand up alone.

Belmode still had to resist the pressure of the water on his diaphragm, and his mouth was like an octopus sucker, firmly sucking Lin Shinichi's lips, leaving no gaps.

Both sides also have to control the speed of air supply and inhalation, otherwise if the force is too strong on either side, the air will easily leak out.

As long as there is the slightest mistake, the result is that the two of them choke together.

It's simply an impossible task.

And even if it is successfully delivered, it can only help people to renew their breath.

Therefore, for Lin Xinyi, he has only one choice now.

That is to get Belmode out of the air as soon as possible.

"You can't just send it to the sea, it's too late."

"It's okay... The ballroom is not yet completely filled with seawater, and there is an 'air bag' on top. ”

Just like after a ship capsizes and suddenly falls down, the remaining air in the boat will be pressed above by the water, forming an air bag in space.

As the water pressure rises, the air becomes denser and denser. The pressure generated by the air itself will eventually balance with the pressure of the floating water.

Now the same is true of this undersea ballroom.

Although the sea water poured in from the outside, there was still an air bag on the top of the banquet hall.

This air sac could be a transit point for Belmode's escape.

Thinking of this, Lin Xinyi quickly sank to Belmode's side and held the sports car that was weighing heavily on her with his hand.

“Boy？！”

Belmode's eyes were full of surprise.

She also thought that she had seen a beautiful hallucination before she died.

And Lin Xinyi turned her hallucinations into reality.

With a slam of his luck up, he lifted the heavy car off the ground and slowly moved it to the side.

Belmode was saved.

She was still confused in this near-death pain, but Lin Xinyi had already hugged her shoulders and swam up with her.

The two of them surfaced together and reached the "air bag" at the top of the banquet hall to breathe and rest.

"Whew... Call... Whew..."

Belmode gulped in the air he hadn't seen for a long time.

Her silver hair, which had been tied in an elegant bun, was all draped down, wet and sticking to her pale cheeks, messily draped on her shoulders and Lin Xinyi's shoulders.

Belmode at this moment is completely devoid of the usual mystery and nobility.

She looked embarrassed, powerless, and even vulnerable.

“Boy...”

Belmode never thought she would survive.

And it was the child she owed too much to save her.

Belmode couldn't help but hug Lin Xinyi tightly.

At this moment, she seemed to be able to feel the same warmth from Lin Xinyi as the angel lady.

"Are you better, teacher?"

Lin Xinyi asked with some concern:

"Moreover, the building has been shaking since the explosion, and there may be a second collapse."

"We have to swim out as soon as possible and swim to the surface."

Belmode leaned weakly on Lin Xinyi's shoulder, took a few deep breaths, and finally turned ruddy in his pale face.

"Hmm... I'm fine. ”

There was spirit in her voice.

The usual confident and mysterious Belmode seems to be back:

"Let's go, let's swim out together."

"Hmm." Lin Xin nodded.

He took Belmode's hand and dive into the water with her.

The two of them swam quickly through the flooded banquet hall, approaching the explosion gap that had been blown open by the bomb.

Next, as long as you swim out of this gap and swim out of the sea, you can successfully escape.

But at this critical moment...

The building, which had been collapsing and trembling since the explosion, suddenly trembled again.

This originally impregnable building, like a snowman sunburned at this moment, completely lost the strength to support its standing, and the whole collapsed with a bang.

The collapse of the building also affected the undersea ballroom, which was located directly below the building.

The ceiling, which could barely be leaned up, collapsed in an instant, completely blocking the way.

"It's... Oops! ”

Lin Xinyi and Belmode's faces changed:

The good news is that the building has stopped shaking and should not collapse further.

But the bad news is... Their way was blocked.

In other words, they were trapped in this undersea ballroom like the victims of the earthquake.

The people in the houses collapsed by the earthquake still have air, but the place where they are is is under the sea!

There was sea water everywhere, and only the remaining air sac could provide them with a place to breathe.

The trapped Lin Xinyi and Belmode had no choice but to swim back to the top of the banquet hall and return to the air bag to breathe.

And something even worse happened.

"The ceiling is starting to leak..."

"Because the building just collapsed, the ceiling cracked, and the air bag will soon be unsustainable."

Lin Xinyi's tone became extremely solemn.

Once this air bag collapses, the entire banquet hall will be completely submerged.

At that point, he and Belmode will be trapped at the bottom of the sea, unable to escape, but also unable to breathe.

"Dive Air Bottle..."

Belmode remained calm:

"To build this underwater facility completely below the surface of the sea, there should be some emergency diving air tanks in it just to be safe!"

"If we can find the cylinders in this ballroom, we can hold on a little longer."

"When the time comes... If the water rescue team can arrive in time and let the frogmen open this underwater ruin, we maybe... Maybe there's a chance to get out alive. ”

At the end of the day, her voice wasn't so confident either.

Because Belmode knew very well in his heart that the hope of survival for the two of them was already very slim.

The air bag will soon be untenable.

Whether or not you can find the air cylinder is not certain.

Even if they did, the oxygen in the air cylinder might not be enough to sustain them until rescue arrived.

"Let's go find it."

"As long as there is a glimmer of hope, we must keep alive."

Lin Xinyi said calmly with such a look.

He didn't seem to be at all overwhelmed by the danger of being trapped at the bottom of the ocean and about to be completely submerged.

Lin Xinyi's composure couldn't help but infect Belmode.

Unconsciously, she also quietly had more motivation to survive in her heart.

In this way, Lin Xinyi and Belmode dived into the water again and began to look for possible emergency diving air cylinders in this half-collapsed undersea banquet hall.

Soon after...

They resurfaced, back into the air sac that was about to disappear.

"Only one working compressed air bottle was found."

"Other... All crushed by the falling ceiling. ”

Lin Xinyi and Belmode's expressions were very solemn.

There was only one air cylinder, and there was less air available than they thought.

This means that after the air sac bursts, they will have a very limited amount of time to stay in the water.

If they don't succeed in getting them out by the time the air runs out, they'll die here.

Belmode thought so.

Then, she removed the second-stage head mouthpiece from the emergency air cylinder, and a forced smile appeared at the corner of her mouth:

"Boy, let's wait alternately with this air bottle."

"If we're lucky, we can all survive."

Lin Xin was silent for a while.

He looked closely at the only compressed air cylinder they had in their hands.

The volume shown on the bottle is 12 litres and the signal valve indicates a pressure of 200 bar, which means that 200 times the same amount of air is filled into the bottle.

At present, the amount of air in the bottle is 12L*200.

It may seem like a lot, but the problem is that the amount of air a person breathes out per minute on land is generally estimated to be 30 L/min.

And the air in this bottle can't be used for all.

As mentioned before, because of the presence of seawater pressure, the air in the air tank must have a certain pressure in order for the diver to breathe in the air normally underwater.

So, at a depth of almost 10 meters, when they sucked the air cylinder from 200 bar to 50 bar, they were almost out of breath.

Then calculate the density of the water in Shanghai, and the depth at which they are located, according to the general oxygen consumption...

"Theoretically, the air in this compressed air bottle is only enough for a person to last underwater for half an hour."

"Of course, Belmode, as a skinny woman, will consume a lot less oxygen than the general estimate – she should be able to hold on a little longer than the calculated figures."

Lin Xinyi was doing calculations quickly in his heart.

Then, after some contemplation, he said to Belmode in a firm tone:

"Teacher, you use this gas cylinder alone."

"W-What?" Belmode was somewhat suspicious of his ears.

"You use the gas cylinder alone." Lin Xinyi repeated seriously: "I don't need it. ”

According to his calculations, even if Belmode was used alone, the cylinder might not last until help arrived.

It would be even more inadequate if he was to use it together.

Therefore, Lin Xinyi decided to let Belmode use the air bottle alone.

"You—" Belmode's expression was wonderful: "Do you want to die?" ”

"Give me the oxygen cylinder, what are you going to do?!"

She looked at her students in disbelief.

Belmode never imagined that this child, who had drifted away from him, would make such a sacrifice for her.

Yes, not just salvation, but sacrifice.

A villain like her, who lives in darkness, is still willing to sacrifice for her?

She'd done such cruel things to him... But does this child still love her so much?

For the first time in Belmode's life, he was so complicated that he couldn't speak.

“......”

Lin Xin was silent for a while.

He didn't know how to explain it.

In fact, Lin Xinyi has never worried about himself.

Because he's not the kind of ordinary person who suffocates for a few minutes without breathing.

When he rescued Akemi Miyano before, Lin Xinyi was underwater the whole time and didn't show up for more than half an hour.

Not only was he not suffocated, but after he went ashore, he also had the strength to give artificial respiration to others.

According to his unscientific and more refined turtle breathing ability, if he just lies still in the water...

"Teacher, don't worry..."

Lin Xinyi endured a not very nice sentence and didn't say it:

Even if you soak the corpse and spread all over your body, I won't die.