"I'm Li Kui, the second place on the first day."

"No wonder you remember my name, the second place often remembers the first place's name very well."

"Don't you remember me?"

"I don't remember, the first place often doesn't remember the second place."

"..."

...

At the bottom of Doomsday Abyss, in front of that broken goblin train.

Chen Mang led a group of goblins to the front of the train, took out three cigarettes from his pocket, lit them, and stuck them in the ground. He looked at the goblin train with a serious expression and spoke softly.

"Doba."

"I once promised you here to help you rebuild the goblin civilization."

"Today, I promise you again that as long as you can stay in the Constant Star Train, this promise will definitely be fulfilled."

"Mm-mm."

Doba knelt on the ground with a serious expression, surrounded by a group of goblins: "I have never doubted Master Mang, the Goblin Race will always be Master Mang's most loyal subjects!"

...

After doing all this.

Everyone returned to the train.

Chen Mang then took out a train order, allowing Biaozi to activate the train order and act as the Train Captain for a small experiment.

As expected.

Even when Biaozi's train stayed at the disguised elevator entrance for a few minutes, there was no reaction, and no funnel emerged asking Biaozi for an Energy Stone,

just as he had guessed.

It seems that a train can only trigger that interaction when it emerges from the train tunnel, that is, when it comes up via the train elevator, and then reappears at the train elevator entrance.

Otherwise, considering how long he had stayed in the Doomsday Abyss, having come here many times, it wouldn't make sense for it to have never been triggered before.

In this view.

The only way to enter the "train tunnel" appears to be... a Level 100 drill, or there's a hidden entrance within the mechanical city ruins in the Red Zone in Crisis Valley that has simply never been discovered.

The Constant Star Train again took the "train elevator" back into the train tunnel.

Driving all the way to the end of the train tunnel.

"..."

Sitting in the train carriage, Chen Mang watched the illusory light lines on both sides of the tunnel rapidly recede, focusing his sight forward. Without the Level 100 drill, he couldn't enter this region; the drill was indeed very useful as an accessory.

And he now understood why there were no trains seen underground in "Crisis Valley".

Initially, he speculated that there must be many high-level monsters underground. Although his target detection radar hadn't detected any, it was likely simply absent in his area, but now... clearly that wasn't the case.

It wasn't because the trains in "Crisis Valley" lacked the drill accessory either.

In fact, almost all trains in Crisis Valley opted for "train expansion," enlarging their sizes. Naturally, their power in every aspect increased, allowing stronger firepower accessories and larger spaces.

But the downside was...

The drill became unusable.

The hole the drill created was too small to fit the expanded trains through, making it impossible for the trains to travel underground.

In this view.

"Train expansion" might not be suitable for him. Many of his opportunities came from the drill, and the Level 100 drill could break many barriers other trains couldn't, like this train tunnel, or the Flesh and Blood Train adventure map in the Kunlun Mountain area.

This needs to be postponed.

Unless he can find a high-position replacement accessory for the drill.

A more powerful, larger drill.

It would only cost tens of thousands of iron ore; he hadn't even used Murphy Stone yet. Such a loss of iron ore was tolerable, as it wasn't even more than watching a movie.

...

This time, it took exceptionally long!

Even at full speed, it took a whole hour before the continuously lit white fluorescent lights on both sides of the train tunnel changed back to blinking red warning lights, with another train elevator ahead.

Only this time, the train elevator wasn't on the sides of the tunnel.

It was directly ahead in the tunnel.

The end was reached.

This was the end of the train tunnel. There was no road ahead. Chen Mang looked at the control panel screen, which showed he was in an unknown region, no longer in the "Tieling Wasteland".

"Whew..."

Chen Mang took a deep breath, slightly nervous, as he parked the train at the elevator entrance and took a Level 2 Energy Stone from his pocket, tossing it into the extending funnel, watching the slowly opening elevator doors.

But he still controlled the train to enter the elevator.

The elevator began slowly ascending.

He didn't know what lay behind this elevator, where it would lead, whether it would be a beginning or an end, but he just wanted to say that this train tunnel was really long...

So many incandescent lights along the way, who knows how long they've been lit.

The Energy Stone sustaining this tunnel must at least be Level 5!

Any lower, and it should have been depleted long ago.

One Level 5 Energy Stone requires five million units of iron ore.

Right now, his train had a Level 5 Energy Stone, though only 19% of its capacity remained, which he had been reluctant to use. This Energy Stone was found in the secret factory on that snow mountain in "Ice and Snow World".

Lost in thoughts.

"Ding."

The elevator stopped, accompanied by the slow opening of its doors.

What came into view was a massive plaza, as large as several football fields, with no pillars for support in the center. The entire space appeared extremely desolate and devoid of human presence. Whether the walls or the ceiling were pure white, various experimental instruments were scattered around the plaza, exuding a techno-aesthetic.

However, by now, a thick layer of dust had settled on the plaza's ground.

The walls weren't as white anymore.

Countless dried dark red bloodstains could be seen on the ceiling and walls, evidence of a tragic disaster where many had died, but not a single corpse was in sight.

The most significant part of the plaza.

Was a massive glass dome.

Somewhat akin to the glass-protected laboratory beneath the "Earth Core Nuclear Bomb" military base.

Within this massive glass dome... were unexpectedly three iron ore deposits!

Three Level 4 iron ore deposits!

"Holy cow..."

Chen Mang's eyes slightly narrowed as he glanced at the information displayed on the "Resource Detection Radar" before gradually maneuvering the train out of the train elevator and into the massive plaza, which was as high as ten meters.

Even with the train entering, it didn't feel oppressive at all.

The radar displayed that these three iron ores had an estimated extraction volume of around 30 million.

This trip was worth it.

Even though he didn't know what this place was, as long as he could fully extract these three Level 4 iron ore deposits, it would already be profitable, enough to upgrade the train armor to Level 12!

Once he returned to the "Crisis Valley" area, he'd be able to act with impunity.

Only...

This place was a bit eerie; the walls around the plaza were all constructed from materials that could shield radar detection, rendering his target detection radar and resource detection radar useless beyond this plaza.

Yet around the plaza, there were six small doors whose destinations were unknown.

...

The "massive glass dome" at the center of the plaza appeared extremely sturdy, with numerous bloodstains left on it, indicating someone had attempted to violently destroy this glass dome but ultimately failed.

It's not clear if a Level 100 drill could break through.

But the most crucial thing now was to see what this place truly was, what relation it had to other regions, like "Doomsday Abyss", "Heaven-Reaching Tower", and that secret factory in Ice and Snow World.

Why these places were connected by a train tunnel.

The Constant Star slowly came to a halt.

With the hissing sound of gases, the doors of Guard Carriage 7 opened.

Biaozi, with a solemn expression, was the first to jump down, followed by the members of Team One and Team Three.

The six doors around the plaza weren't high, just like normal doors, rendering Mecha unable to enter.

Their mission was to investigate what lay behind those six doors, whether there was danger, and what this place was.

...

"Ai."

Chen Mang, sitting calmly in the control room, turned his head to look outside the train at Biaozi and the others quickly gathering, and remarked thoughtfully, "If you let your mind wander, what do you think this place is?"

"It looks like an experimental base."

"But do you know what I'd think of if I let my mind wander?"

"What?"

"I would think of Six Doors."

"What are the Six Doors?"

"Hmm... how should I put it, something like a secret institution within a national system."

"Oh, such a puzzling association, I will strive to learn."

Chen Mang remained silent.

He already had a vague sense of what this place might be, perhaps indeed something akin to a secret institution like the Six Doors, with the train tunnel likely serving as a secret tunnel for continuously transporting massive amounts of iron ore to other places.

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