Go back and forge the drill accessory first.

...

Inside the train compartment.

Chen Mang took out the white-grade vehicle accessory blueprint "Drill" from the drawer and slammed it onto the control panel. When the blueprint transformed into white light dots, it consumed another 100 units of iron ore.

The next moment—

A massive drill appeared at the front of the train and could freely extend and retract.

Without any hesitation.

He used 4,400 units of iron ore at once to directly upgrade the white accessory "Drill" to Level 10.

"So cheap."

Chen Mang couldn't help but sigh. 4,400 units of iron ore was just enough to feed his batch of slaves for three days. Although it felt a bit pricey when feeding them, by the time he reached the high-grade resource mines deep underground, these slaves would explode with unbelievable production efficiency.

At that time.

The iron ore within his train would be more than he could ever use.

Among all the trains in the "Tieling Wasteland," he was probably the only one with the "Drill" accessory, meaning he was the sole person able to mine the advanced resource mines underground. No one else could compete with him.

Unless other trains had the capability to go to "Kunlun Mountain" and find the Pangolin to obtain the drill accessory blueprint.

Once all the resource mines deep under the Tieling Wasteland were mined, even if his train went to a high-level area, it wouldn't be as embarrassing as it is now.

The level upgrade of the drill accessory is mainly reflected in two aspects.

First is the drill's hardness.

Second is the drill's rotational speed.

The former ensures that as long as the drill's level is high enough, there would hardly be any rocks underground that could block the train's path. If the drill level is relatively low, encountering some harder rocks would leave no choice but to take a detour.

The latter ensures drilling efficiency.

In other words, it ensures the speed of the train navigating underground.

The speed of underground navigation is definitely slower than on the surface; the higher the drill level, the faster the rotational speed, thus allowing for faster underground travel.

"Set off!"

Without spending much time, Chen Mang gathered all the slaves onto the train and maneuvered the train at full speed towards the coordinates of the Doomsday Abyss.

...

Several hours later.

The Constant Star Train successfully arrived at the Doomsday Abyss, switched back to "Spider Legs," and drove along the cliff face into the depths of the valley. As it was about to reach the valley bottom, the drill extended and began to rotate at high speed.

The whole train, as if a hot knife through butter, quickly sank into the ground and disappeared.

The underground was pitch black.

There was no light whatsoever.

He could only rely on the "Resource Detection Radar" to slowly head towards the two Level 2 iron mines beside the underground river 2000 meters below the Doomsday Abyss. He glanced at the train data on the control panel.

The current speed was 170 km per hour.

Not bad, quite fast indeed.

The train "Drill" opened tunnels for the train to pass through, pressing the soil to both sides. As the train passed, the soil on both sides slowly pushed back into place, effectively creating a temporarily maintained underground tunnel that was inaccessible for long-term use.

Notably—

This time, mining didn't require groping in the dark. Although he still hadn't acquired the "Headlight" accessory for illumination, during his search for survivors in the ruins of Taiping City, he also scavenged a good amount of supplies.

Canned food, cigarettes, liquor, etc.

These included some recreational items like paper books and some video tapes, as well as... some industrial flashlights powered by batteries. Although there weren't many, they were just about sufficient.

...

Soon.

Sitting in the control room, Chen Mang could hear the sound of flowing water in his ears; the Constant Star Train had finally successfully reached the underground river.

"..."

Chen Mang was the first to jump off the train, scanning the surroundings with a flashlight. The beam swept through every corner. They were now in a giant cave; the air was quite humid, and in the darkness, the constant sound of the underground river hitting the rocks echoed around.

The river wasn't that wide.

It occupied about a quarter of the cave's width, with the water level lower than the adjacent open ground. If it suddenly poured rain, the water level might rise to fill the entire cave.

The oxygen was still quite sufficient.

At least, by himself, he didn't feel any discomfort while breathing. But with so many people... it's uncertain whether the oxygen would be enough. Let's start mining and see. If it's really not sufficient, head to the train radio and ask which Train Captain has any oxygen-producing accessories.

Buy one back.

On the quarter-wide open ground beside the cave.

2 wet and shiny Level 2 iron mines were situated there, resembling allurements that captivated attention.

And at that moment, a group of slaves was already, under Old Pig's guidance, lining up to collect their pickaxes and today's food, then heading in orderly batches into the mining area to start picking at the mines.

Finally—

The pleasant and crisp chinking sound echoed once again in Chen Mang's ears.

"It's truly the most beautiful sound in the world."

Chen Mang smiled with satisfaction, proving that the tremendous effort, nearing life and death, to Kunlun Mountain was worth it, and the feedback to him was indeed very satisfying.

Next, it was time for him to harvest.

...

Inside the train compartment.

While other slaves were already busy working, Chen Mang was alone in the train compartment, feet propped up on the table, lighting a cigarette and relaxedly enjoying the films of this world.

I must say, they were quite entertaining.

Very refreshing.

It was a doomsday movie with a deep sense of immersion and engagement. If the train were now amidst a Corpse Tide instead of beneath a cave, the engagement would be even stronger.

When the slaves were busy, he had nothing else to do.

When the slaves were idle, that's when he had to get busy.

Such was the train's operational rule.

The Train Captain decided the big direction, and those below executed detailed tasks, with either being indispensable.

Chen Mang glanced at the "Drill" accessory's two supermodel effects after reaching Level 10.

-

"Drill Level 5 Supermodel Effect": Extremely hard, increased rotation speed.

"Drill Level 10 Supermodel Effect": Even harder, even faster rotation speed.

-

Honestly speaking.

This was his first time witnessing such a pure supermodel effect, without any mechanics, a purely singular numerical beauty.

The inherent effect of upgrading the drill was to increase its hardness and rotational speed.

The result was that both supermodel effects further enhanced this effect.

One can imagine.

With this level of "Drill" accessory, even if other trains also had "Drills," their speed navigating underground would be far inferior to his.

And...

"..."

Chen Mang pondered, since the drill was both hard and fast, it shouldn't be solely used for underground navigation, right? It could also be used to ram other trains. It feels like if the armor level isn't high enough, it would be hard to withstand.

Soon.

He cast these thoughts aside, being exhausted for days on end and not wanting to think about it for now. It was his downtime.

Then once again, he gazed with unwavering focus towards the doomsday movie beside him.

At that moment in the movie, the male protagonist was already surrounded by zombies, deeply entrenched. Just as Chen Mang was fully engrossed, curious to see how the protagonist would escape, suddenly a semi-transparent panel popped up before the protagonist.

On the panel, small text read:

"Ding, you have unlocked the system for getting stronger by killing zombies."

"Damn."

Seeing this scene, Chen Mang was momentarily stunned before bursting into a curse: "Do all the movies in this world film like this damn it?"

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