Real World Simulator

Fang Yu was not aware of the changes in the shelter.

At this time, he was still on his way in the tunnel of the subway.

Because along the way, Fang Yu's prestige has been quietly improving, coupled with Chang Shan's teachings, Fang Yu quickly mastered the skills of moving forward in the subway, combined with the miscellaneous survival knowledge in his mind, In just half a day, Fang Yu successfully obtained the actual leadership of the team.

Chang Shan didn't complain at all, and directly retreated to the second line.

For Chang Shan, the mission was the most important thing in this trip. In addition, in the army, the capable ones always prevailed, and a captain who was traveling temporarily had someone to fight for.

Fang Yu walked in the forefront, holding a torch. Now the dark tunnel in front of others is a three-dimensional map in his eyes, with an arrow in the dark passage, guiding him with incomparable accuracy.

Suddenly, just as Fang Yu was walking forward, Fang Yu felt the flame of the torch in his hand dim suddenly.

"Wait!"

Fang Yu's voice echoed in the tunnel, and the team members behind him stopped.

Fang Yu looked at the torch in his hand seriously.

I saw that the original orange flame suddenly weakened a lot, and for some reason in the darkness, there was a layer of cyan halo around the flame. This reaction was not very obvious, but because Fang Yu had been paying attention, so , this reaction is also in his observation.

In Fang Yu's novice gift pack, the survival knowledge includes not only the wilderness, but also various survival knowledge of various underground caves.

In memory, torches are the most important resource when walking in underground passages or caves.

It's not just torches that provide light and scare away some light-resistant animals that survive in the dark.

It is also because, through the torch, it can be judged whether many places can be walked, and whether there will be risks.

If the fireworks are weak, it means that in this space, the air circulation is small and the oxygen is insufficient, which leads to the weakening of the flame. The smaller the flame, the scarcer the oxygen.

And through the derived knowledge of the flame reaction principle of the flame, it can be known that the flame burns in the air in different components, and the refracted flame colors are different.

The normal flame is orange in oxygen, but under the reaction of phosphine, it will turn green or blue-white.

This is the former so-called will-o'-the-wisp, dark fire.

However, to change the color of the flame as a whole, the amount of air is not enough. Generally, various powders or corresponding metal blocks are used for flame reaction, and there will be obvious reactions.

Air alone can at most cause some weak spectral effects, that is, to show halos similar to different colors.

This change is very subtle and can only be found by careful observation.

Fang Yu also discovered it through observation when the flame was weakening.

This shows that in the front passage, there is less oxygen in the air, and there may be other toxic and harmful gases.

"There may be an area of ​​turbid air ahead. In order to prevent accidents, everyone wears a gas mask. Because oxygen is scarce, everyone tries to lower their heads."

As soon as Fang Yu finished speaking, everyone behind him took out their gas masks from their backpacks.

As a prop for air filtration, the gas mask actually has a certain anti-virus effect, but at the same time, it also blocks the normal breathing of the human body.

Because the air must be filtered through the filter before it can be inhaled into the body, which actually hinders the absorption of oxygen.

Therefore, especially in this underground tunnel, the oxygen itself is not sufficient. Wearing a gas mask all the time will only cause hypoxia, and can only be worn when passing through a certain dangerous area.

This is also the correct way to use a gas mask.

Before Fang Yu, they usually didn't know to wear a gas mask until someone felt dizzy from the smell.

In the past, there were many accidents of staff reduction due to this.

Now with Fang Yu's reminder, they have indeed saved a lot of trouble along the way.

Putting on their masks, everyone bent down and lowered their heads slightly, and continued to follow Fang Yu.

Fang Yu could feel that the tunnel seemed to go down. The further down, the weaker the flame, and the more difficult it was to breathe.

Fortunately, the flame did not go out, indicating that there was still enough oxygen.

Fang Yu tried to speed up his pace so that the people behind him could also follow, and they had to pass through this area quickly.

The twilight of the torch showed different halos in the darkness, indicating that in addition to oxygen, there are many other elements in the air, and the content is quite high.

Fang Yu lowered his head and quickened his pace. He could tell from the feeling under his feet that he had reached the bottom of the tunnel, and it was the most difficult place to breathe here, and his heartbeat accelerated crazily due to lack of oxygen.

But Fang Yu could only hold his breath and continue to move forward.

Fortunately, after reaching the bottom, after walking for a while, Fang Yu felt that he had started to climb.

And the flame also slowly recovered from its weakness.

Oxygen is gradually increasing.

It wasn't until they reached a certain position that the torch returned to its original flame size, and the color no longer had various halos. After Fang Yu led the crowd for a dozen steps, he asked everyone to take off their masks.

After taking off the gas mask, everyone including Fang Yu was breathing crazily.

It was as if he wanted to suck back all the oxygen he had sucked before.

After everyone slowed down for about four or five minutes, they continued on their way.

But this time, after walking for more than ten minutes, everyone came to the first stop.

The route planning this time, although the straight line on the map shows only a dozen kilometers, but because of the various bends, the total length is about 20 kilometers.

Now they have been walking for half a day, nearly four hours, and have traveled about ten kilometers.

Compared with walking on snow on the surface, it is more than twice as fast.

If Fang Yu had been able to walk through the subway before, it is estimated that he could have arrived a few days earlier, and he might not even encounter a storm.

However, even if Fang Yu wanted to take the subway at that time, he couldn't.

Basically, most of the subway entrances are covered by ice and snow.

Except Ziyang Refuge can break the frozen ice layer in the subway and dig a hole leading to the surface from the ground. If other people want to dig a hole outside, it will consume a lot of energy and heat. , not to mention the great risk.

All in all, according to the speed of Fang Yu and others, they can arrive at Union Medical College Hospital the next day.

The speed can be said to be very fast.

After rushing for a long time, although there were torches, everyone was still in the dark, so everyone was very nervous.

After arriving at the resting station, everyone ran to the subway entrance above.

Although the subway entrance has been covered with ice and snow, and the temperature is very low.

But at least here, there is still a glimmer of light.

Everyone tremblingly walked to the bottom of the subway entrance, letting the light from outside shine on themselves.

Although this is not sunlight, but the kind of light that is equivalent to a cloudy sky, and there is a blizzard outside.

But even so, standing in the light, everyone seemed to have been redeemed, and the cold and flushed faces under the mask were full of comfort.

Even if they are only forced to live underground, everyone still yearns for the light.

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