Live Wilderness Adventure

The foul smell of sewage flooded like mountains, and the rancid and moist smell went straight through the brain, making people unable to breathe.

"My God, it's too stinky here! What's the matter? Did you go straight to the toilet? Just...Hey, what's wrong with you!?"

Matthew squeezed his nose tightly, tears streaming down his face, and asking vague questions with stones, but his heart was cold as soon as he turned his head.

In the dark environment, everyone only saw Bi Fang leaning against the wall and retching, his face was pale, his eyes were bloodshot, and his viscous saliva flowed out unconsciously and dripped to the ground.

"Hello, hello, are you okay?"

Matthew was so frightened that he jumped up, and cleanly stepped forward to support Bi Fang, which was far more terrifying than his own vomiting. If Bi Fang had an accident now, he would have to follow suit.

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

"It's okay, I'll take a moment!"

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

The smell that even normal people feel nauseous when they smell it is magnified a hundred times in Bifang's nasal cavity. The mucous membrane of the nasal cavity is like being scorched. Every olfactory cell is wailing crazily, just like facing a stink bomb!

Turning out the memory of going to the smelliest toilet, and then thickening the smell dozens of times at that time, it is probably what Bi Fang feels now, and being able to persist until now is an expression of his strong willpower.

After breathing several times in a row, Bi Fang was a little more conscious, and the remaining distance was less than a hundred meters, but unless he stopped breathing from now on, he would no longer be able to move on.

But a round trip is 200 meters, and in the middle, I have to look for a suitable location to make a bomb. I can't figure it out in less than five minutes. It's still five minutes of constant activity.

Hearing Bi Fang said that he could not handle it, Matthew panicked: "What should I do?"

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

Bi Fang was still a little confused, and the plan was perfect, but he never expected that he would be stumped by this section of the sewer, the taste here is really exciting.

"The smell of ordinary sewers is difficult to break through the physiological limits of humans. I suspect that there may be hydrogen sulfide and perhaps methane. Very large factories will be equipped with septic tanks to avoid the accumulation of sewage, etc., which may be abandoned for several months. The gas filtration system happened to be malfunctioning, coupled with the exhaust fan failure, the sewer air was not circulated, resulting in the content of hydrogen sulfide in the air far exceeding normal standards."

"In July last year, a 19-year-old girl died of hydrogen sulfide poisoning in Busan, Bang Country. This 19-year-old female student came to a public toilet near the swimming pool and never came out after going in.

Twenty minutes later, the companion saw that the situation was not good, and rushed into the toilet to find that the girl had fallen to the ground and was unconscious. The smell of the toilet was unbearable, and the companion almost fainted, and kept vomiting while saving people. The girl was not rescued afterwards, and the cause of death was hydrogen sulfide poisoning. "

"At that time, the gas filtration system failed, and a large amount of hydrogen sulfide was generated, which was then released from the vent of the public toilet where the girl was killed. In the narrow toilet, the concentration of hydrogen sulfide was as high as 1000ppm, which is more than the 15ppm specified by the safety standard. It is 60 times higher. At high concentrations, hydrogen sulfide can even cause death in a matter of seconds. The poisoning mechanism of cyanide is similar."

Matthew's eyes widened as he heard it, and his breathing became lighter. He looked around and saw Bi Fang behave like this. He quickly tore off a piece of cloth from his body and covered his mouth and nose after getting wet.

"It's useless." Bi Fang shook his head. "I cover my nose and mouth to relieve the irritation. The wet towel is just a fiber 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 isolated, making people unable to breathe."

[Damn it, so dangerous? Never go to public toilets again]

[Scary, too scary]

[Lao Fang knows too much, acting chemist]

[Ah, I found it! When hydrogen sulfide enters the blood, it will quickly find an oxidized cytochrome oxidase that binds to the ferric ions of heme. The reduced cytochrome oxidase, which is supposed to reduce the ferric iron of this enzyme to divalent iron, transfers electrons during the redox process to utilize molecular oxygen. 】

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

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

"Now what?"

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

Unexpectedly, Bi Fang waved his hand and signaled to Matthew to be safe: "Don't worry, there are many toxic gases in the sewers, so I will be prepared before going down. In this case, we can make a simple gas mask. , Can't you remember what I told you to do before coming down?"

"You mean the charcoal?"

Matthew quickly put down his backpack and took out a large handful of black charcoal pellets from it, which Bifang asked him to make this morning, but he didn't explain the reason. Now he somewhat understood.

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

"What we are encountering is toxic gas, so there must be no less toxic materials, and there are just a few 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, pierced a small hole at the bottom with a screwdriver as the air inlet of the canister, and cut an arc at the other end and placed it on his face to make sure it matches the shape of the human nose. Adapted to the shape.

"All three materials are very good, especially charcoal, but I processed it a little bit and made activated carbon with better effect. The preparation of activated carbon is also very simple. Just use firewood 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 it to the mouth of the bag, and boil it in an acidic solution for more than 30 minutes to wash out the oil."

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

"Yes." Bi Fang nodded, "Vinegar contains acetic acid. You can use other acids without vinegar, such as hydrochloric acid, sulfuric acid, and even citric acid. Citric acid is added to many foods, even some cosmetics. You can use it all, as well as alkaline sodium carbonate. If there is really nothing, you can even induce vomiting and cook with stomach acid."

Bi Fang nodded, put a sponge on the bottom of the plastic bottle pierced hole, followed by sawdust, put in 7cm, compacted to 5cm, and then separated a layer of gauze, this time put 3cm of activated carbon, and then put a layer of sponge.

The simple gas mask is finished.

"We can use the sealing material as a face mask. UU reading www.uukanshu.com plastic bags are fine. Note that they must be soft, thick, and transparent, and they must not leak air."

Bi Fang extruded the tank body from the inside of the bag, sealed the interface firmly with tape paper, and added a fixing belt through the tank body and passed it to Matthew.

"The next road is up to you."

"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. I don't want to hide it. My sense of smell is much better than that of ordinary people. The smell I smell is many times that of you. I can't get in anymore."

"And don’t detonate it with antifreeze. You just sprinkle it directly on the ground. Only don’t light it with an open flame. Use the newspaper I taught you last time to wrap potassium permanganate and antifreeze. The ignition process takes about 30 seconds. , After making it, throw it directly on the ground and run towards me. Be fast, understand?"

Bi Fang looked serious, and the appearance of hydrogen sulfide changed his mind.

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

If the flashlight in your hand is not a very tightly sealed military flashlight, you might not even be able to use the flashlight.

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

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

How many people will be attracted by blowing up half a street?

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