In the tunnel's direct front, two giant banners appeared mid-air on both sides.

Their size was somewhat similar to highway billboards.

Large characters were written on them.

"Flesh and Blood Train Prohibited from Entering."

Dozens of large-caliber cannons and over a dozen high-speed cameras were embedded next to the billboards. Clearly, if a Flesh and Blood Train was detected, those cannons would immediately open fire.

However...

The dust on those cannons had nearly formed into amber. Could they still be activated, and at what level? It was unclear.

"..."

Chen Mang narrowed his eyes slightly, withdrawing his gaze from the banners on both sides, gradually slowing down. It was now fairly certain; this was not a civilian Train Tunnel but a wartime military tunnel.

But the issue now was...

Based on Ai's prompt, a kilometer ahead was the junction between "Crisis Valley" and "Zombie Basin." The speed needed to be reduced to avoid crashing into an air wall and ending up dizzy and confused.

Yet the tunnel still seemed to have no end.

"What a pity."

He sighed regretfully, not expecting this tunnel to lead to the Zombie Basin. Being a Level 10 train, advanced trains were unable to enter lower-level areas, one of this world's fundamental rules.

The only puzzling thing was, he had previously delved over 20,000 meters into the Zombie Basin's core and had never detected this tunnel.

In the next moment—

In the time Chen Mang spent in idle thoughts, the Fixed Star train had again sped several thousand meters.

"Huh?"

Chen Mang was slightly taken aback, looking incredulously at the control panel screen: "Ai, we should be inside the Zombie Basin area now, right?"

"Yes, we have returned."

Without any air wall obstruction, he smoothly and effortlessly navigated back through the Train Tunnel into the Zombie Basin.

The control screen displayed the current area as... the Zombie Basin.

"This is crazy."

He rubbed his eyes, somewhat bewildered, looking into the endlessly deep tunnel. Did he really just voyage back with ease? Where was the area barrier? Ignored?

But soon a flicker of a peculiar shine appeared in his eyes.

This Train Tunnel evidently defied logic, and the more illogical it seemed, the more it implied something unusual was in this tunnel!

...

After driving for nearly two more hours.

The incandescent lights lining the tunnel finally turned into constantly flickering red warning lights, seemingly heralding an unusual crisis ahead.

The speed of the Fixed Star train gradually slowed down once more.

Soon, a huge Train Elevator appeared on the right side of the tunnel.

Yet this was still not the end of the "Train Tunnel," just a small branch alone.

"Train Captain, should we order Biaozi and the others to explore?"

"No need."

Chen Mang shook his head: "This is a Train Elevator. If there is a crisis, it is usually a train-level crisis. How could Biaozi and they withstand it?"

He then maneuvered the train slowly to the entrance of the "Train Elevator."

Just came to a steady stop.

A long funnel stretched out at the elevator entrance, directly pressing against the train cabin window, with a sign clearly displaying:

"Please insert a Level 2 Energy Stone."

5000 units of iron ore.

Not too expensive.

Taking a freshly crafted Level 2 Energy Stone from Ai's hand, he inserted it.

In the next moment—

The constantly flashing red warning light at the middle top of the "Train Elevator" instantaneously turned into a steady green. Accompanied by the sound of cable extension and contraction, the Train Elevator began to open slowly.

A puff of dust was ejected from the elevator.

Not sure how long it had gone unused.

He even saw a torn spider web in the corner.

"Impressive."

Chen Mang somewhat admired, as he pushed the control lever, guiding the Fixed Star into this unknown elevator, deep underground at thirty thousand meters, where even spiders could spin a web here. How did they find such a hidden corner?

What do they eat?

The elevator had not been operational for a long time; let's hope nothing unexpected happens.

"Squeak..."

Along with the measures of mechanical equipment operating, the elevator began ascending rapidly, without any control buttons inside, seemingly heading only to one place.

...

Ten minutes later!

The elevator stopped.

As the doors opened, Chen Mang gazed at the scene before him, his mouth slightly gaping, eyes full of amazement!

In front of the train.

Was a ruin of a Mechanical City, countless buildings collapsed, reinforced concrete and various steels scattered across the chaotic urban ruins, as if a nuclear explosion had struck here!

No doubt about it.

This was indeed the "Earth Core Nuclear Bomb" adventure map!

The Train Elevator he was in, camouflaged within a hill, with mountain soil visible on both sides. He could even see the "Supersonic Tunnel" where he once fled.

Except its entrance was blocked by rubble now.

"Damn..."

"This damn thing is connected?!"

In disbelief, Chen Mang drove the Fixed Star train out of the elevator. Behind him, the elevator door closed slowly, merging with the mountain, so seamlessly that no difference could be perceived, and even the Target Detection Radar was incapable of detecting the train elevator inside this small hill.

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