The world record of holding breath underwater can reach more than 20 minutes, but holding your breath while exercising will greatly consume the oxygen in your body, which can only last for two or three minutes at most, plus this bit of air in the helmet, Yu Yifeng will last for five minutes at most.

The five-minute countdown rang in my mind...... It has to be done as soon as possible!

Passing through this gate, it is simply the hardest hit area of nanobots, and in just a few moments, all kinds of green markers are densely spread on the ground like soybeans, like a carpet of seaweed, and this carpet is expanding.

It may be that the metal elements here, which provide them with abundant materials, are expanding so quickly.

Yu Yifeng's scalp was numb, and if it hadn't been for "Ling" to mark these robots for him, he would have had to give up this operation.

Maybe...... Walk in and you're decomposed!

Now he just needs to take some risks, he can only believe in "Ling" unconditionally, and has marked everything.

There was no time to hesitate, Yu Yifeng's heart was horizontal, and he slowly swam over sideways. After the power armor is taken off, of course, it also has benefits, it can sense the flow of water, and the whole body is much more flexible.

But such strenuous exercise makes the air in the helmet leak out, and the consumed ones are consumed, and most of them are quickly used.

After trembling and avoiding the algae marks at the door, stepping on a metal floor under his feet, Yu Yifeng quickly pressed his electromagnetic rifle against a machine and pulled his wrench. "Bang!" All of a sudden, a nearby instrument was smashed.

It is always easier to destroy than to create, and it is impossible for these high-precision devices to completely defend against human high-speed bullets.

The huge recoil of the gun caused his entire body to tilt violently, and he almost touched a green cloud of algae.

In an instant, a cold sweat broke out on his back again, and he quickly stabilized his figure. To know...... It's a nanobot wrapped in it!

His beating heart was increasing his oxygen consumption, and even after soaking in seawater, he was really sweating on his own. However, he couldn't control this physiological reaction at all, so he could only speed up his hands.

"It's dangerous!"

Nanobots are simply unreasonable.

As soon as it comes into contact with human cells, it will forcibly extract certain metal elements from them as nutrients for self-replication. Don't think that human cells don't have metal elements, calcium, sodium, potassium, magnesium, and iron are basically present in every cell, and if any one of them is missing, human cells will die.

If the infinite replication nanobot is used to destroy the world, it is definitely more effective than the nuclear bomb that is stranded, and there will be no life left.

Be any!

This kind of disaster, in some science fiction, is called "Gray Tide", but he didn't expect to be able to witness it with his own eyes...... I don't know if these things can be reproduced indefinitely.

Yu Yifeng couldn't help but curse and curse in his heart, and sucked the last breath of air in the helmet violently.

"Last Three Minutes ......"

He broke the instruments one by one, used the laser cutting tool he carried to cut out some chip-like small things, and didn't care to tell what it was, and threw them directly into the helmet.

Irradiating the surroundings with a flashlight, I suddenly saw an elevator facility, and it seems that there should be underground space in this laboratory!

However, there is no other entrance and exit other than the elevator...... This elevator seems to be out of power.

There are no defenses in the lab, and it is not necessary that some circuits have been damaged by nanobots......

When I turned my head again, I saw that these green clumps were spreading rapidly at a speed visible to the naked eye! In just a short period of time, it occupies most of the laboratory, and it is everywhere in the east and west.

Yu Yifeng gritted his teeth again and spit out a large pile of turbid bubbles, this quietness, like a big hand of shadows, was slowly choking his throat.

It's underwater, it's very inconvenient to move, it's dark and cramped, and the only light is from the helmet and the submarine outside......

Claustrophobia, lack of oxygen, the fear of death is affecting the emotions in his heart, he feels a little dizzy in his head, and instinctively wants to breathe, which is a manifestation of great psychological pressure.

"It's going to be as soon as possible, ...... in less than two minutes"

At this time, he heard a soft "bang" outside, it should be the oxygen cylinder of the power armor that exploded, and he shouted again in his heart that it was not good, this explosion must have spread the nanorobots everywhere.

Not thinking much about it at this point, he regained his composure, turned and swam again at a radar-like thing.

This thing is about a meter tall, and it feels like a very important thing.

Yu Yifeng fired a few shots at the bottom of the radar, and then directly cut it off with a cutting tool, and carried it hard, and his heart was shocked.

"It's so heavy!"

"And ...... One minute! ”

If you take this with you, you won't be able to swim up! What to do?

He was in a hurry, but at this time, he suddenly heard the exclamations of Zhao Yao and the others, and something seemed to have happened outside.

"Hurry, Captain, get out of here!"

"Green ...... Green! ”

"Come out! Velocity...... It's about to be surrounded! ”

These sounds are transmitted through the water through the broadcast of the power armor, and it sounds like a strange "buzzing" feeling.

But Yu Yifeng still didn't understand what was going on, the group of nanorobots at the entrance of the passage was about to close the exit!

At this moment, he dared not hesitate, and suddenly lifted the radar with a force. Good guy, counting the buoyancy of the water, it is a full one or two hundred catties!

“…… Swim still! This strenuous exercise increased the consumption of oxygen, and he felt that a large area of darkness had fallen in front of him, which was a precursor to a large lack of oxygen.

If you take it with you, you won't be able to escape!

"Quick, Captain, quick!"

“…… Come on! ”

In this extremely dangerous situation, Yu Yifeng's adrenaline surged, and he forcibly let himself calm down, facing a huge choice......

First, drop this radar and forcibly swim out by yourself, after all, there is already a harvest in the helmet!

Second, it may be an opportunity to search for the entrance to the space below and then find a way out...... It's hard to say what the hell is in the barrier below, and maybe even the air!

The green tendons on Yu Yifeng's forehead jumped, and his face was blue, I don't know if it was because of suffocation or other reasons. That elevator is not energized, it must be no longer usable, where is the entrance, has it been blocked by nanobots?

The large area in front of him darkened, and he bit the tip of his tongue violently, and a spicy taste suddenly poured into his throat.

You can't be dizzy at the moment, and you'll definitely die if you faint!

Just as he was about to give up this radar regretfully, he suddenly felt his whole body suddenly lighten, as if he was being held by a big hand, and rushed out of the exit.

Yu Yifeng was in a state of extreme concentration at this time, relying on a strong breath. Being dragged unprepared, my heart was nervous, and I poured a few mouthfuls of seawater into it, and then choked on the bronchi, and the whole lung reacted strongly, and a large number of bubbles were all spit out.

"There are enemies!" He subconsciously wanted to shoot in the back, and the ability of a person to be at the bottom of the sea was too limited.

But in a daze, he quickly thought that it should be "Ling" who suddenly opened his head and was helping him......

"Hurry! Come on! ”

“…… It's closed! ”

"...... Don't stop me! ”

The algae at the exit has been overflowing, and in fact these are the markers of "Ling", and they are about to block the entire exit.

Suddenly, a huge wave of water forcibly swept them away, and immediately after, the marked seaweed also came into contact with the nanobots and were quickly devoured.

But taking advantage of this effort, Yu Yifeng had already passed through this exit like a fish and shot out like a cannonball.

In the next moment, several arms had firmly grasped him.

"It's the captain!"

Zhao Yao was overjoyed in his heart, he saw the power armor on Yu Yifeng's body disappear, and instantly thought of something. I wanted to unplug the oxygen tube on my power armor, but I thought that Yu Yifeng's lungs were all water, and he couldn't breathe oxygen anymore.

All he could do was shout: "Quick! Retreat, retreat! ”

"Prepare for a large-yield nuclear bomb! And the pulse bomb ......"

At this last moment, Yu Yifeng was exhausted, there was a large area of darkness in front of him, but there was no oxygen supplement, he only saw his teammates, and ...... A green group...... This thought gradually dissipated, and finally I fainted.

But what he was holding in his hands...... Still haven't put it down!