Live Wilderness Adventure

Chapter 357 Gas Mask

The stench of sewage poured in like an overwhelming sea, and the rancid and moist smell went straight to the brain, making it difficult to breathe.

"Oh my god, it stinks here too! What's going on? Did it lead directly to the toilet? Just now... Hey, what's wrong with you!?"

Matthew pinched his nasal cavity tightly, tears streaming down his face, and asked vaguely with a stone in his mouth, but as soon as he turned his head, his heart was half cold.

In the pitch-black environment, everyone could only see Bi Fang leaning against the wall and retching non-stop. His face was pale, his eyeballs were bloodshot, and thick saliva flowed unconsciously and dripped to the ground.

"Hey, hey, are you okay?"

Matthew was so frightened that he almost jumped up, and hurried forward to support Bi Fang. This was much more terrifying than his own vomiting. If Bi Fang had an accident now, he would have to die too.

He is a small pendant, and Matthew knows this very well.

"It's okay, I'll take it easy!"

Bi Fang leaned against the wall and slowly sat down on the ground, cut off a section of clothes under his waist, soaked it in clean water and covered his mouth and nose to feel better.

The smell that even normal people would feel disgusting was magnified a hundred times in Bi Fang's nasal cavity. The nasal mucosa seemed to be on fire, and every olfactory cell was howling crazily, just like facing a stink bomb!

Digging out the memory of going to the smelliest toilet, and then intensifying the smell dozens of times at that time, is probably how Bi Fang feels now. Being able to persist until now is already a manifestation of his strong willpower.

After several consecutive breaths, Bi Fang regained consciousness a little bit, and the remaining distance was less than 100 meters, but unless he stopped breathing from now on, he would no longer be able to move forward.

But it takes 200 meters to go back and forth, and you have to find a suitable place to make a bomb in the middle. It can't be done within five minutes, and it's still five minutes of constant activity.

Hearing that Bi Fang said he couldn't handle it, Matthew panicked: "Then what should I do?"

"Don't worry, let me think, think..."

Bi Fang was still a little dazed, the plan was perfect, but he never expected that he would be stumped by this section of sewer, the smell here is too exciting.

"It is difficult for the general sewer smell to break through the physiological limit of human beings. I suspect that there may be hydrogen sulfide and perhaps methane here. Super-large factories will be equipped with septic tanks to avoid the accumulation of sewage and so on. A few months of abandonment may make this place The gas filtration system happened to be malfunctioning, coupled with the failure of the exhaust fan, the sewer air was not circulating, resulting in the hydrogen sulfide content in the air far exceeding the normal standard."

"In July last year, a 19-year-old girl died of hydrogen sulfide poisoning in Busan, Bangguo. The 19-year-old female student went to a public toilet near the swimming pool, but she never came out after entering.

After 20 minutes, the fellow traveler saw that the situation was not good, rushed into the toilet and found that the girl had fallen on the ground, unconscious. The smell in the toilet was unbearable, and even the companion was almost fainted by the fumes, and kept vomiting while saving lives. The girl was not rescued afterwards, and the cause of death was hydrogen sulfide poisoning. "

"At that time, the gas filtration system also failed, producing a large amount of hydrogen sulfide, which was then released from the vent hole of the public toilet where the girl died. In the narrow toilet, the concentration of hydrogen sulfide was as high as 1000ppm, which is 15ppm higher than the safety standard. It is 60 times higher. And at high concentrations, hydrogen sulfide can even cause an 'electric shock-like' death in a few seconds. The mechanism of cyanide poisoning is similar."

Matthew at the side heard that his eyes widened and his breathing became lighter. He looked around and saw that Bi Fang followed suit. He quickly tore off a piece of cloth from his body and covered his mouth and nose after wetting it.

"It's useless." Bi Fang shook his head, "I cover my mouth and nose to relieve the irritation. The wet towel is just a fibrous fabric, which cannot block these gas molecules, and has no anti-virus effect. If it can effectively block smoke and poisonous gas , the air will also be cut off, making it impossible for people to breathe."

[Damn, so dangerous? I will never go to a public restroom again]

【Scary, too scary】

[Old Fang knows too much, a generational chemist]

【Ah, I found it! When hydrogen sulfide enters the blood, it will quickly find an oxidative cytochrome oxidase and combine with the ferric ion of heme. The ferric iron of this enzyme is supposed to be reduced to ferrous iron by reduced cytochrome oxidase, which transfers electrons in the redox process and thus utilizes molecular oxygen. 】

[Continued: But hydrogen sulfide will snatch ferric iron, which also blocks the human respiratory chain, causing hypoxia in tissue cells. In addition, hydrogen sulfide also has a strong cytotoxic effect on the lungs in the respiratory system, causing severe damage to lung tissue and pulmonary edema! ! ! 】

Netizens who reacted quickly have already started thousands of degrees, and found out the hazards of hydrogen sulfide,

"Now what?"

Seeing that the wet towel was useless, Matthew didn't know what to do. As a photographer, he didn't know how to save himself in this situation.

Unexpectedly, Bi Fang waved his hand and signaled Matthew to be calm: "Don't worry, there are often poisonous gases in the sewer, so I was prepared before I came down. In this case, we can make a simple gas mask , do you still remember what I asked you to do before you couldn't come down?"

"You mean the handful of charcoal?"

Matthew quickly put down his backpack, and took out a large handful of black charcoal particles from it. This was what Bi Fang asked him to make this morning, but he didn't explain the reason, but now he vaguely understands it.

Bi Fang took the bag of charcoal and explained: "A gas mask is generally composed of four parts: poison filter material, smoke filter material, insulating material and strong sealing material."

"What we encounter is poisonous gas, so there must be a lot of poison filter materials. There are only a few kinds that can be easily found in the wild, one is lime soil particles, the other is activated carbon, and the third is charcoal."

Bi Fang took out an empty plastic bottle, used a screwdriver to pierce a small hole at the bottom as the air intake of the canister, and cut out an arc on the other end, and put it on the face to make sure it matched the shape of the nose and face. Adapt to the shape.

"The three materials are very easy to obtain, especially charcoal, but I processed it a little bit to make activated carbon with better effect. The preparation of activated carbon is also very simple, just burn it with wood to make charcoal, and then knock it into small pieces of charcoal , Put a small piece of charcoal into a clean fine nylon mesh bag, tie the bag mouth, put it in an acidic solution and boil for more than 30 minutes, and the oil will be washed out."

Matthew on the side suddenly realized. "No wonder you asked me to put vinegar in the morning! It's acetic acid, right?"

"That's right." Bi Fang nodded, "Vinegar contains acetic acid. Without vinegar, other acids can be used, such as hydrochloric acid, sulfuric acid, or even citric acid. Citric acid is added to many foods, and even some cosmetics. You can use them all, even alkaline sodium carbonate. If you really don’t have anything, you can even induce vomiting and boil it with stomach acid.”

Bi Fang nodded.

He put sponge on the bottom of the hole in the plastic bottle, followed by sawdust, put it in 7cm, and compact it to 5cm. Put a layer of gauze on it, put 3cm of activated carbon, and then put a layer of sponge.

The simple gas mask is finished.

"Let's just use another sealing material as a mask. A plastic bag is fine. Be careful that it is soft, thick, and transparent, and it must not leak air."

Bi Fang squeezed the tank out of the bag, sealed the joint firmly with adhesive tape, added a fixing belt through the tank, and handed it to Matthew.

"You will have to walk the rest of the way by yourself."

"Okay...huh?" Matthew took the gas mask and was putting it on his head. He was taken aback when he heard this, and pointed to himself, "Me?"

Bi Fang nodded: "It's you. To be honest, my sense of smell is much more developed than ordinary people. The smell I smell is several times that of yours. I can't walk in anymore."

"And don't use antifreeze to detonate it. You just sprinkle it on the ground. Don't use an open flame to ignite it. Use the newspaper I taught you last time to wrap potassium permanganate and antifreeze. The ignition process takes about 30 seconds. Throw it on the ground after making it, and then run towards me! Be quick, understand?"

Bi Fang looked serious, and the appearance of hydrogen sulfide made him change his mind.

Nine out of ten gases in the sewer are flammable and explosive, so he never used an open flame from the beginning to the end.

If the flashlight in his hand was not a military flashlight with strong airtightness, he might not even be able to use the flashlight.

The power of the explosion depends on the amount of explosives. A bucket of antifreeze and half a bucket of gasoline can explode completely, which may attract some people, but it is definitely limited.

But what about the hydrogen sulfide and methane in the entire sewer?

How many people will be attracted to blow up half the street?