The stench of sewage surged in like a mountain, and the putrid and moist smell went straight to the brain, making people choke and unable to breathe.
"Oh my god, this place stinks so much! What's going on? Is it directly connected to the toilet? Just now... Hey, what's wrong with you!?"
Matthew pinched his nose tightly, with tears streaming down his face. He held the stone in his mouth and asked vague questions, but as soon as he turned around, his heart dropped.
In the dark environment, everyone could only see Bifang leaning against the wall and retching, his face pale, his eyeballs filled with bloodshot eyes, and his thick saliva unconsciously flowing out and dripping to the ground.
"Hey, hey, are you okay?"
Matthew was so frightened that he almost jumped up. He quickly stepped forward to help Bifang. This was much more terrifying than vomiting himself. If Bifang had an accident now, he would also die.
He is a small pendant, and Matthew knows this very well.
"It's okay, I'll take it easy!"
Bi Fang slowly sat down on the ground while holding on to the wall. He cut off a section of the clothes under his waist, soaked it with water and covered his mouth and nose to feel better.
The smell that even normal people would find disgusting was magnified a hundred times in Bifang's nasal cavity. The nasal mucosa felt as if it was on fire, and every olfactory cell was howling crazily. It was no different from facing a stink bomb!
Digging out the memory of going to the smelliest toilet, and then intensifying the smell at that time dozens of times, this is probably how Bi Fang feels now. Being able to persist until now is a sign of his strong willpower.
After ventilating several times in a row, Bi Fang regained his consciousness a little. The remaining distance was less than a hundred meters, but unless he stopped breathing from now on, he could no longer move forward.
But the round trip is 200 meters, and in the middle you have to find the right place to make the bomb. It won't be done if you don't lay the foundation for five minutes. It's still five minutes of constant activity.
Hearing Bi Fang say that he couldn't handle it, Matthew panicked: "What should we do?"
"Don't worry, let me think about it, think about it..."
Bi Fang was still a little confused. The plan was perfect, but he never expected that he would be stumped by this section of sewer. The smell here was really exciting.
"It is difficult for the general sewer smell to break through the physiological limits of humans. I suspect there may be hydrogen sulfide and perhaps methane here. Very large factories will be equipped with septic tanks to avoid the accumulation of sewage and other materials. After a few months of abandonment, this place may be
The gas filtration system happened to malfunction, coupled with the failure of the exhaust fan, the air in the sewer was not circulating, resulting in the content of hydrogen sulfide in the air far exceeding the normal standard."
“In July last year, a 19-year-old girl died of hydrogen sulfide poisoning in Busan, a country that is famous for. The 19-year-old female student went to a public toilet near the swimming pool and never came out after going in.
20 minutes later, seeing that the situation was not good, his companions rushed into the toilet and found that the girl had fallen to the ground and was unconscious. The smell in the toilet was so unbearable that even the companions almost fainted, and they kept vomiting while rescuing people. But the girl
He was not rescued after the incident, and the cause of death was hydrogen sulfide poisoning."
"The gas filtration system also malfunctioned at that time, producing a large amount of hydrogen sulfide, which was later released from the vent hole of the public toilet where the girl died. In the small toilet, the concentration of hydrogen sulfide was as high as 1,000 ppm, which is fully higher than the 15 ppm stipulated in safety standards.
It is 60 times higher. At high concentrations, hydrogen sulfide can even cause an 'electric shock'-like death in a few seconds. The poisoning mechanism of cyanide is also similar."
Matthew's eyes widened as he heard this, and his breathing became lighter. He looked around and saw that Bifang was following suit. He quickly tore off a piece of cloth from his body, wetted it and covered his mouth and nose.
"It's useless." Bi Fang shook his head, "I covered my mouth and nose to relieve the irritation. The wet towel is just fiber and silk fabric. It 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 it impossible for people to breathe.”
[Damn, is it so dangerous? I will never go to a public toilet again]
【Scary, so scary】
[Lao Fang knows too much and is a chemist]
[Ah, I found it! When hydrogen sulfide enters the blood, it will quickly find an oxidative cytochrome oxidase and combine with the ferric ions of heme. The ferric iron of this enzyme should originally be reduced to ferrous iron
Reduced cytochrome oxidase transfers electrons during the redox process, thereby utilizing molecular oxygen.】
[Continued: However, hydrogen sulfide will steal ferric iron, which will block the human respiratory chain and cause tissue cells to be hypoxic. In addition, hydrogen sulfide also has a strong cytotoxic effect on the lungs in the respiratory system, causing
Lung tissue was seriously damaged and pulmonary edema occurred!!!]
Quick-reacting netizens have already started researching the dangers of hydrogen sulfide.
"Now what?"
Seeing that the wet towel was of no use, Matthew didn't know what to do. He was a photographer and had no idea 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 toxic gases in the sewers, so I was prepared before I came down. In such a situation, we can make a simple gas mask
, do you still remember what I asked you to do before you came down?"
"You mean that handful of charcoal?"
Matthew quickly put down his backpack and took out a handful of black charcoal particles. This was what Bifang asked him to make this morning, but he didn't explain the reason. Now he vaguely understands.
Bi Fang took the bag of charcoal and explained: "Gas masks generally consist of four parts: poison filter material, smoke filter material, isolation material and strong sealing material."
"We are encountering toxic gases, so there must be no shortage of poison filtering materials. There are only a few types 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 and used a screwdriver to poke a small hole in the bottom as the air inlet for the canister. He also cut an arc at the other end and placed it on his face to fit it, making sure it matched the shape of the human nose and face.
Adaptable shape.
"All three materials are easy to obtain, especially charcoal, but I processed it a little to make 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 small pieces of charcoal into a clean fine nylon mesh bag, tie the mouth of the bag, put it in an acidic solution and boil it for more than thirty minutes to wash out the oil."
Matthew on the side suddenly realized. "No wonder you asked me to put vinegar in it this morning! It's acetic acid in it, right?"
"Yes." Bi Fang nodded, "Vinegar contains acetic acid. If you don't have vinegar, you can also use other acids, hydrochloric acid, sulfuric acid, or even citric acid. Citric acid is added to many foods and even some cosmetics.
You can use any of them, including alkaline sodium carbonate. If there really is nothing, you can even induce vomiting and cook it with stomach acid."
Bi Fang nodded.
He put SH cotton at the bottom of the hole in the plastic bottle, followed by sawdust, put in 7cm, and compacted it to 5cm. Separated a layer of gauze, put in 3cm of activated carbon, and then put a layer of sponge.
The simple gas mask is now made.
"We can just use another sealing material as a mask. A plastic bag will do. Make sure it is soft, thick, and transparent, and it must not leak."
Bi Fang squeezed the can out from the inside of the bag, sealed the interface firmly with tape, added a fixing belt through the can, and handed it to Matthew.
"The rest of the way is up to you."
"Okay... huh?" Matthew took the gas mask and was putting it on his head. He was stunned 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 what you smell. I can't walk in anymore."
"And don't use antifreeze to detonate it. Sprinkle it directly on the ground. Don't use an open flame to light it. Use the newspaper I taught you last time to wrap potassium permanganate and antifreeze to ignite it. The ignition process takes about thirty seconds.
After making it, just throw it on the ground, and then run towards me! You have to be fast, do you understand?"
Bi Fang looked serious, and the appearance of hydrogen sulfide made him change some of his thoughts.
Nine out of ten gases in the sewer are flammable and explosive, so he never used an open flame.
If the flashlight in my hand wasn't a highly sealed military flashlight, I might not even be able to use it.
The power of the explosion depends on the amount of explosives. A complete explosion of a barrel of antifreeze and half a barrel of gasoline may attract some people away, but it is definitely limited.
But what if it’s hydrogen sulfide and methane in the entire sewer?
If half the street is blown up, how many people will be attracted there?