Chapter 358 Tragedy caused by excrement explosion

"Let's go." Kanna stood up and led everyone to set off immediately. Anyway, there was not much luggage to pack, so for wanderers, they could just leave at any time.

The "oasis" where they were was the habitat of the Black Fire Ravens, and the firelight and warmth made this place "full of vitality." However, it was also full of dangers.

Kanna took a look at her hometown and resolutely led her people into the darkness and coldness. In her pocket, there was a compass with a broken shell, which was turned out from the stomach of an alien beast, along with some half-digested human equipment, but only this compass was barely usable.

After walking for a while, they had to stop again because an "old man" could not walk anymore. The old man was in his forties and looked as old and haggard as if he was in his fifties or sixties.

Kanna used her earth-related abilities to dig a temporary shelter, and everyone hid inside.

She went to look for some edible plant tubers and ambushed a lone injured alien beast on the way. Seeing that it was not poisonous and could be eaten, she cut off a leg and dragged it back. It was impossible to bring the whole beast back because it was too big and would affect her movement.

The remaining corpses left in place can also attract the attention of alien beasts or other mutated beasts on the earth.

When they returned to the shelter, everyone was excited to see the exotic animal meat to eat.

This leg weighs dozens of kilograms, enough for everyone to have a full meal. Although the meat is unpalatable, it is more nutritious than plant tubers.

In addition, there are four sharp claws on the claws, which Kanna made into spears and distributed to the young and strong men in the team.

Along the way, Kanna also picked up some "sun bones", which are the skeletons of dead black fire crows. These bones are rich in calories and can keep you warm if you hold them in your arms. However, you need to wrap them in layers of linen, otherwise you will get burned.

In addition, the skeleton can also emit the breath of strange beasts, which will make other strange beasts that are not as powerful as the Black Fire Crow "stay away".

Along the way, Kanna relied on her earth escape ability to find food and help everyone escape many disasters. She was very glad that this ability she had awakened was quite useful. Although some of the strange beasts could burrow into the ground, they could not burrow into the ground.

Those strange beasts that burrow into the ground simply use their claws to dig holes in the ground; they are not true burrowing machines. Therefore, their burrowing speed is not fast, nor can they burrow too deep.

Several times, she escaped danger by fleeing deep underground.

In fact, in the deep Black Fog Star Region, there are also many exotic beasts that can burrow underground. However, those who are good at burrowing underground are generally not good at long-distance interstellar travel, so these exotic beasts with earth burrowing skills did not follow the army to the solar system.

As for those gods and god kings who have sunk deep into the moon and the earth, it is because they have reached the "god" level and have the ability to "communicate with gods". They do not need to learn earth escape; they will learn it naturally.

Especially the God King Realm, who can not only escape underground, but also escape into the "dark universe". In the center of the earth, those beasts in the God King Realm fight for the "power of the earth" in the dark universe. Because the "power of the earth" (the heart of the earth) is hidden in the dark universe.

Even though Kanna was agile and quick-witted, she still lost some people along the way. When they had walked more than 100 kilometers, the team had gone from 37 to 29, a total of eight people lost! "By the time we reach the Holy City, there will probably be only a few left. Maybe we won't even make it." Kanna sighed. She hid her people in a temporary shelter, made a good cover, and told everyone to lie low. Then she set out again to look for food.

This time, she was luckier and happened to come across an underground city located on the China-India border.

She used earth escape to sneak into the city and stole some food and warm clothes, as well as several lighters and flashlights.

However, this underground city is occupied by upper castes, and strict checks are being carried out on lower castes, especially Dalits, and anyone found will be expelled or killed.

The tribesmen couldn't get in, so she could bring them in and live in this underground city, maybe they could survive. Leaving the tribesmen here, she could go to find Li Sheng alone, and then come back to pick them up after getting Li Sheng's consent.

But obviously, it's not realistic.

Kanna's eyes turned, and suddenly she had an idea. She disguised herself and sneaked into a city with a signal, and used the old communicator to go online. After all, this is an underground city in India, and the infrastructure is not particularly good. Unlike the underground cities in China, all the city areas have network access in almost every corner.

Kanna sent an email to a public email address of Li Xiang, just to give it a try, and introduced herself humbly, explaining her past relationship with Li Xiang, expressing her admiration, and saying that she was taking a team of tribesmen to travel thousands of miles to join him. She hoped to arrive safely and meet her idol as soon as possible.

After sending the email, she sighed. She didn't know if Li Xiang would see it. Even if he saw it, would he pay attention to it? For example, would he send a team to pick her up? "Oh, maybe I'm overthinking it. Li Sheng is so busy, how could he pay attention to a little guy like me? Even if he saw it, he probably wouldn't pay attention to it. It's even more impossible for him to send someone to pick her up. I'm too naive." Kanna actually knew that it was useless for her to do this. But she just wanted to give it a try.

It would be great if Li Xiang could come to save her and her people.

Because although the tribesmen said they wanted to go on a pilgrimage, the road was long and difficult. If she were alone, she would have 70% confidence that she could reach City 03, but with more than 30 ordinary people, there would be no possibility of doing so.

We have only walked less than one-tenth of the distance and eight of them are already dead.

However, staying there was just waiting for death, so she led everyone to take action. In this way, with an obsession (hope) in their hearts, perhaps everyone could hold on a little longer.

"How about we just live around this underground city, and I come in every day to steal some food to feed everyone?"

Kanna had just thought this when suddenly the entire underground city shook and a rumbling explosion sounded from the city below. Kanna was startled and quickly used her special powers to escape quickly. She was originally in the vicinity of the underground city and had not entered the core area, so it was still very fast to escape now.

Even though she ran fast, the huge shock wave caused her chest to feel stuffy and she spat out a mouthful of blood. When she returned to the temporary shelter, everyone was in a panic, not knowing what had happened.

"Could it be that the underground city was attacked by strange beasts?"

"That's impossible. There was no sign before. It was obviously an accident."

Kanna guessed correctly that the underground city was indeed an accident, but it was an accident that she could never have guessed.

"Oh no, this underground city is likely to be exposed and will soon be attacked by the army of alien beasts. I have to lead my people to escape quickly." Kanna reacted quickly. Regardless of her injuries, she looked at the compass and immediately led everyone to continue heading east.

Sure enough, not long after they left, an overwhelming army of alien beasts surrounded and began to attack the underground city.

This underground city was plagued by internal and external troubles. It didn't last even an hour before it was breached by the army of alien beasts and turned into a living hell.

As for why the explosion happened suddenly, even Jiang Caier, who had spies all over the underground city, could not find out the reason.

After this underground city experienced a huge explosion and a large-scale invasion of alien beasts, the underground city was destroyed, almost all the people in it died, and the network and cameras were all "offline", making it naturally impossible to find out.

The latest novel is published first on Liu9shuba!

In fact, the situation was like this:

Because the rulers of this underground city, the upper castes, massacred or expelled the lower castes, resulting in no one doing the menial jobs, and then, feces accumulated more and more. In just a month or two, the feces pool at the bottom accumulated tens of thousands of tons.

Tens of thousands of tons of feces accumulated and fermented, producing extremely dense biogas, and the exhaust system was damaged due to lack of maintenance, so the biogas became increasingly dense.

Biogas is mainly produced by the fermentation of organic matter under anaerobic conditions. The main component is methane (CH4), which usually accounts for 50%-70%, followed by carbon dioxide (CO2) and other gases such as hydrogen sulfide.

Among them, methane is the main combustible component, while some other gases such as hydrogen sulfide are toxic and inhaling too much can cause death.

According to some information, each ton of organic waste (such as feces) can produce about 20-30 cubic meters of biogas during anaerobic fermentation, of which the methane content is about 50-70%.

Assuming an intermediate value, for example, 25 cubic meters of biogas is produced per ton of manure, of which methane accounts for 60%. Then the total gas production is 50,000 tons × 25 m/ton = 1,250,000 cubic meters of biogas, of which methane is 1,250,000 × 0.6 = 750,000 cubic meters.

The heat of combustion of methane is about 55.5 MJ/kg, or about 15.4 kWh/kg. The density of methane under standard conditions (0°C, 1 atm) is about 0.717 kg/m. Therefore, the mass of 750,000 cubic meters of methane is 750,000× 0.717 kg≈ 537,750 kg, or about 537.75 tons of methane.

The total combustion energy of methane is 537750 kg× 55.5 MJ/kg≈ 29840625 MJ.

One ton of TNT is equivalent to about 4.184 GJ (or 4184 MJ). Therefore, the total TNT equivalent is 29840625 MJ÷ 4184 MJ/ton ≈ 7130 tons of TNT.

Of course, not all of the biogas is fully burned or exploded after being ignited, but even taking one-tenth of it is equivalent to 713 tons of TNT, and taking two-tenths is equivalent to 1,426 tons of TNT.

Small tactical nuclear bombs (such as the US W54 nuclear bomb) have an equivalent of about 1,000 tons of TNT.

At that time, in this underground city, near the bottom of the city, a man of the third caste went to the toilet with a cigarette in his mouth. He smelled a strange odor, but could bear it because it was a dry toilet and he was used to it in peacetime.

In India, even in peacetime, proper toilets are scarce and dry toilets are everywhere.

The man squatted down and used his lighter to light a cigarette, but he never expected that with a "bang", the methane gas would be ignited.

Suddenly, huge burning and explosion occurred!

Furthermore, the explosion was in a relatively closed space at the bottom of the dungeon, and the power generated by it might be even greater than that of a small tactical nuclear bomb.

This kind of underground city was originally cramped, and the construction quality of the Indian underground city was mediocre, so disaster struck.

In fact, incidents caused by safety hazards such as fire are not uncommon in underground cities of various countries, but this is the only one caused by feces explosion.

(End of this chapter)