Returning to hometown to farm: The apocalypse system arrived ten years earlier?

Chapter 358 The Tragedy Caused by the Poop Explosion

“Let’s go then.” Kanna stood up and led everyone to set off immediately. Anyway, there was no luggage to pack. For wanderers, it’s all about being able to leave whenever they want.

The "oasis" they inhabited was a habitat for black-flaming crows, and the firelight and warmth made it "vibrant with life." However, it was also fraught with danger.

Kanna glanced at her homeland and resolutely led her people into the darkness and cold. In her pocket was a compass with a broken outer shell, which she had found in the stomach of a strange beast, along with some partially digested human equipment, but only this compass was barely usable.

They had to stop again after walking for a short while because one of the "elderly" people simply couldn't walk any further. This elderly man was in his forties, but looked as old and haggard as someone in his fifties or sixties.

Kanna used her earth-based powers to dig a temporary shelter, where everyone hid.

She went to find some edible plant tubers, and on the way, she ambushed a lone, wounded beast. Seeing that it seemed non-poisonous and edible, she cut off its leg and dragged it back. Bringing the whole thing back was unlikely, as it would be too large and hinder her movement.

The remaining corpses, left in place, can attract the attention of alien beasts or other mutated wild animals on Earth.

Back at the shelter, everyone was thrilled to find that there was meat from the strange beasts to eat.

This leg weighs tens of kilograms, enough for everyone to have a hearty meal. Although this kind of meat is hard to eat, it is still more nutritious than plant tubers.

In addition, the claws had four sharp claws, which Kanna turned into spears and distributed to the able-bodied men in the team.

Along the way, Kanna also collected some "sun bones," the remains of dead Blackfire Ravens. These bones were rich in heat and could keep one warm when held in one's arms. However, they needed to be wrapped in layers of burlap, otherwise they would burn one.

In addition, the skeletons can also emit the aura of strange beasts, causing other strange beasts that are not as strong as the Blackfire Crow to "shrink back upon smelling them".

Along the way, Kanna relied on her earth-遁 (earth-遁 is a type of magical ability) to find food and help everyone escape many calamities. She was very grateful that her awakened ability was quite useful. Among the strange beasts, although some could burrow underground, they could not use earth-遁.

Those burrowing beasts simply use their claws to dig holes and crawl in; they don't actually use earth-遁 (earth-遁 is a type of burrowing technique). Therefore, they can't burrow very quickly or go very deep.

Several times, she escaped death by fleeing into the depths of the earth.

In fact, there are many alien beasts in the deep black mist star field that can use earth-遁 (earth-遁 is a type of magic or magic). However, those who are good at earth-遁 are not good at long-distance interstellar travel, so these alien beast groups with earth-遁 skills did not follow the army to the solar system.

As for those gods and god-kings who have disappeared into the depths of the moon and the earth, it's because once they reach the "god" level, they have the ability to "communicate with the gods," and they don't need to learn earth-遁 (earth-遁 is a type of magic or magic), they will naturally know it.

Especially those at the God-King realm, who can not only use earth-遁 (earth-遁 is a technique for escaping through space), but can also enter the "Dark Universe." Within the Earth's core, those God-King realm beasts vie for "Earth's Authority" in the Dark Universe. This is because "Earth's Authority" (the Earth's core) is hidden within the Dark Universe.

Despite Kanna's agility and quick wit, losses were inevitable along the way. After traveling more than 100 kilometers, the team had dwindled from 37 to 29, a loss of eight people!
"By the time we reach the Holy City, there will probably be only a few left. Perhaps, we won't even make it there," Kanna sighed. She hid her people in a temporary shelter, made sure they were well-protected, and instructed them to lie low. Then she set off again to find food.

This time, she was lucky; she actually stumbled upon an underground city located on the Sino-Indian border.

She used earth magic to infiltrate the city, stealing some food, warm clothing, a few lighters, and flashlights.

However, this underground city is occupied by high-caste people who are strictly investigating low-caste people, especially Dalits. Anyone found doing so will be expelled or killed.

Her people couldn't go in, otherwise she could bring them in and live in this underground city; perhaps they could survive there. Leaving her people here, she could go alone to find Li Sheng, and then come back to fetch them once she had Li Sheng's permission.

But clearly, that's unrealistic.

Kanna's eyes lit up, and she suddenly had an idea. She disguised herself and sneaked into a district with a signal, using her old communicator to go online. After all, this was an Indian underground city, and the infrastructure wasn't particularly good, unlike underground cities in China where almost every corner of the district had network coverage.

Kanna sent an email to one of Li Xiang's public email addresses, just to try her luck. She introduced herself in an extremely humble manner, explained her past connection with Li Xiang, expressed her admiration, and stated that she was leading a group of her people on a long journey to seek refuge with him. She hoped to arrive safely and meet her idol as soon as possible.

After sending the email, she sighed softly, wondering if Li Xiang would even see it. And even if he did, would he care? Perhaps send a team to meet her?
"Heh, maybe I'm overthinking it. Li Sheng is so busy, how could he possibly pay attention to a little kid like me? Even if he did see me, he probably wouldn't care. He'd be even less likely to send someone to pick me up. I'm so naive." Kanna knew that what she was doing was pointless. But she just wanted to try.

If Li Xiang could come to save her and her people, that would be wonderful.

Although her people said they were going on a pilgrimage, the journey was long and arduous. If she were alone, she would have a 70-80% chance of reaching City 03, but with about 30 ordinary people, there was absolutely no possibility of that.

They've only gone less than a tenth of the way, and eight of them have already died.

However, staying in that place would only lead to certain death, so she led everyone to take action. This way, having a lingering hope might allow them to hold on for a little longer.

"How about I live around this underground city and steal some food every day to feed everyone?" Kanna had just thought this when suddenly, the entire underground city shook, and booming explosions came from the bottom area. Kanna was startled and quickly used her superpower to escape. She was already on the periphery of the underground city and hadn't ventured deep into the core area, so escaping was still quite fast.

Even though she ran fast, the huge shockwave made her chest feel tight, and she coughed up 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 a monster?"

"That's impossible. There were no warning signs beforehand. It was clearly an accident."

Kanna was right; the underground city was indeed an accident, but one she could never have predicted.

"Oh no! This underground city is most likely to be exposed and will soon be attacked by the beast army. I have to lead my people to escape immediately." Kanna reacted quickly, ignoring her injuries, she checked the compass and immediately led everyone to continue heading east.

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

This underground city, beset by internal and external troubles, didn't even last an hour before being breached by the horde of alien beasts, turning it into a living hell.

As for why the explosion occurred, even Jiang Cai'er, who has informants all over the underground city, has not been able to find out the reason.

After the massive explosion and large-scale invasion of alien beasts, the underground city was destroyed, almost all its inhabitants were killed, and the network and cameras were "offline," making it even more impossible to find out.

In reality, the situation at the time was as follows:

Because the higher castes, who were in power in this underground city, massacred or expelled the lower castes, no one was willing to do menial jobs. As a result, more and more excrement accumulated. In just one or two months, the latrine at the bottom had accumulated tens of thousands of tons.

Tens of thousands of tons of feces piled up and fermented, producing extremely concentrated biogas. The ventilation system was also lacking maintenance and was damaged, so the biogas became increasingly concentrated.

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

Methane is the main flammable component. Other gases, such as hydrogen sulfide, are toxic and can be fatal if inhaled in large quantities.

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

Assuming an intermediate value, such as 25 cubic meters of biogas produced per ton of manure, of which methane accounts for 60%, then the total biogas production would be 50000 tons × 25 m/ton = 1250000 cubic meters, of which methane would be 1250000 × 0.6 = 750000 cubic meters.

The heat of combustion of methane is approximately 55.5 MJ/kg, or about 15.4 kWh/kg. The density of methane under standard conditions (0°C, 1 atm) is approximately 0.717 kg/m³. Therefore, the mass of 750000 cubic meters of methane is approximately 750000 × 0.717 kg ≈ 537750 kg, or about 537.75 tons of methane.

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

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

Of course, not all the biogas is fully burned or exploded after being ignited, but even if we take one-tenth, it is equivalent to 713 tons of TNT, and if we take two-tenths, it is equivalent to 1426 tons of TNT.

Small tactical nuclear weapons (such as the US W54 nuclear bomb) have a yield of about 1000 tons of TNT.

At that time, in the underground city, near the bottom, a third-caste man went to the toilet with a cigarette in his mouth. He smelled a strange odor, but he could bear it. It was a dry toilet, after all, something he was used to in peacetime.

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

After the man squatted down, he flicked his lighter, intending to light a cigarette, but to his surprise, "whoosh!" he ignited the biogas.

Instantly, a massive fire and explosion occurred!

Furthermore, since it takes place in a relatively enclosed space at the very bottom of the underground city, the explosive power could be greater than that of a small tactical nuclear bomb.

These underground cities are inherently cramped, and given the generally poor construction quality of Indian underground cities, disaster struck.

In fact, incidents caused by safety hazards such as fires are not uncommon in underground cities around the world, but an explosion caused by feces is truly unique.

(End of this chapter)