Dark clouds rolled in and pressed down silently, covering the sky above the Xuanwu base.

The sky was frighteningly low, like a huge black cloth that blocked out all light.

The wind died down, and a suffocating feeling of oppression filled the air.

The first drop of rain fell quietly.

“Pah—”

That was not ordinary rain, but a drop of thick black liquid.

It hit the ground and a puff of pungent white smoke instantly came out.

In just one second, a fist-sized hole was corroded on the ground, with the edges scorched and emitting a foul odor.

This scene was like a small crack opened in hell.

The rain came in greater and greater quantities and began to expand rapidly.

Billions of black raindrops fell from the dark clouds and pierced the earth like arrows.

With every drop of rain that fell, the ground corroded with a sizzling sound and black smoke rose up.

The originally dry sand and dead grass were quickly dissolved by the rain, revealing dark brown mud.

Scarlet cracks spread across the surface, like wounds in the earth, and the smell of corruption seeped out of the cracks.

Song Lufeng stood at the observatory.

His sight penetrated the darkness, overlooking the entire base, his expression as cold as a knife.

Rain fell from the sky, splashing on the glass shield, leaving deep marks of corrosion.

He slowly raised his hand, and a drop of black rain fell precisely on his fingertips.

“Sizzle—”

A burning pain came instantly and his fingers trembled violently as if they were burned by flames.

The rain stayed on his fingertips for less than a second, but left behind charred marks.

He glanced down at his fingers and narrowed his eyes.

"Acid rain."

He whispered, his tone filled with suppressed anger.

He turned his head to look at the ground in the distance, which was already completely covered by black rain.

The remaining vegetation was smoking, and the air was filled with an acrid smell.

Some small animals on the ground turned into a pool of sticky liquid before they even had time to escape.

Song Lufeng clenched his fists slightly.

And all this is just the beginning of the disaster.

The destructive spread of acid rain

The rain suddenly intensified, and dense raindrops fell like arrows.

The surface was completely devoured, and black smoke rose straight into the sky.

What’s even more terrifying is that this rain not only corrodes the ground, but also continues to evaporate.

The evaporating black mist spread and reacted with the oxygen in the air, rapidly destabilizing the atmosphere.

Inside the command center, Chen Zhoumin's face turned pale and his voice trembled:

"City Lord! This is not ordinary acid rain! It contains no water molecules at all, and its composition is unknown, but it can directly react with oxygen and carbon dioxide in the air to produce highly toxic gases!"

He turned his head suddenly and looked at Song Lufeng with fear in his eyes:

"If the rain doesn't stop, not only the surface... the entire base will suffocate!"

Song Lufeng had a blank expression on his face and a cold look in his eyes: "How long can the base's oxygen reserves last?"

"Three days at most." Chen Zhoumin answered in a low voice, as if he had been sentenced to death.

"Three days." Song Lufeng whispered, then turned around and left the observation tower with steady and decisive steps.

The alarm sounded suddenly, and the entire base was in an uproar.

The shrill alarm penetrated every corner, like the call of death.

A cold mechanical voice came from the radio:

"Level 1 evacuation alert activated! All personnel evacuate to the base immediately! No going out! I repeat, everyone return to the city immediately!"

"Shield raised!"

The crowd on the street quickly became chaotic.

Some people fled in panic, while others supported the elderly and children.

But more people were hit by black rain as soon as they arrived at the gate of the base.

A young mother, holding her baby in her arms, ran desperately towards the base.

She took her children out to relax, but unexpectedly acid rain fell suddenly.

A drop of acid rain fell on her shoulder, and with a "hiss", her flesh was corroded, revealing the deep bones.

She gritted her teeth, protected her child and continued running, but the pain on her face was so heartbreaking that it made people feel suffocated.

Not far away, an elderly man was drenched in acid rain because he was slow in his movements.

Before he could even let out a scream, his flesh and skin completely dissolved, turning into a pile of white bones, falling into the mud.

"Help!"

A young soldier rushed out in the acid rain, picked up several civilians who were knocked down by the rain, and dragged them towards the base.

By the time he pushed the last man into the base, his shoulders and arms had already been corroded and turned into a bloody mess.

He was panting heavily, his forehead covered with sweat, and he shouted while enduring the pain: "There are still people who haven't come in! Save them!"

And more people fell on the road leading to the base.

At the last moment before the entrance to the underground base closed, Song Lufeng strode in.

The line of sight swept across the chaotic scene.

"Bang—"

The heavy metal door closed behind him, isolating him from the nightmare outside.

The oxygen outside is getting less and less. Without oxygen exchange, the only way to obtain oxygen is to separate water, but this is by no means a long-term solution.

At the same time, Suzaku Base also activated a level 1 evacuation warning.

"Everyone hide in the underground shelter immediately, now!"

Han Qiong shouted loudly, with a cold expression on his face.

Things were apparently getting better and better, but something like this happened!

About 200,000 survivors were crowded together in the shelter.

There was fear on their faces, their clothes were soaked with cold sweat, and they were shivering all over.

The air was filled with a depressing atmosphere, with the crying of children, the comforting voice of mothers, and the groans of the wounded mixed together.

"In charge..." A military officer walked up to Han Qiong, his voice low and hoarse.

"We have counted the casualties... about 30,000 people who were unable to get into shelters."

He paused, swallowed, and said with great determination: "They may... no longer be here."

Han Qiong closed his eyes and stood there without saying a word.

She was trembling all over.

The only thing to be thankful for is that most people were transferred to the Xuanwu base and they survived.

After a moment, she opened her eyes and asked coldly, "How long can the oxygen last?"

"If the acid rain doesn't stop, the oxygen reserves can only last for two days at most."

The officer's voice was almost choked with sobs.

"Two days." Han Qiong said in despair.

She scanned the crowd and saw those who had lost their loved ones crying, those burned by acid rain huddled in the corner, and the despair in everyone's eyes.

She took a deep breath, turned and walked towards the command room, "Connect City Lord Song."

Behind him, the shelter was dead silent.

"No matter what, we have to survive."