Chen Mang raised his eyebrows slightly, feeling he had guessed the correct usage of the accessory. He really was a genius.

Just then—

Ai's voice came from his ear: "Train Captain, the residents seem to have unearthed something strange while mining. Do you want to take a look?"

"Go."

Chen Mang answered decisively, immediately putting the "Single Soldier Exoskeleton Armor" under his sweater before leaving the train compartment, heading toward the iron mine beside the train.

At this moment, the Train Guard had already cordoned off a particular area.

The rest of the residents continued their work.

Only that one spot was left empty, like Old Pig's former bald head, a patch of emptiness.

"Master Mang."

The guards stood straight and respectfully looked at Chen Mang, speaking in a deep voice.

...

Chen Mang walked into the crowd, seeing a copper door lying flat on the ground, with an electronic lock on it.

The electronic lock and the copper door looked extremely mismatched when merged together.

"Master Mang."

Zhang Damei approached and reported: "A resident uncovered it while mining. Around this door, it's like there's an air wall; pickaxes have no effect when swung down."

Supporting himself with a cane, Chen Mang remotely activated the "Resource Detection Radar" and "Target Detection Radar" on the train but found nothing beneath the copper door, just like the usual ground, with no red dots or any special features.

He took the pickaxe from a nearby guard, walked to the side of the copper door, and swung it toward the ground.

Clang.

It was like hitting metal, with no dirt flying into the air. Even though his eyes clearly saw the pickaxe hit the dirt, the sensation was utterly unlike hitting soil.

His arm tingled slightly.

He returned the pickaxe to the guard, squatted down, and examined the now-cleaned surface of the copper door. Experience told him this was an Adventure Map, like the one for the exclusive Flesh and Blood Train found in the Kunlun Mountain area.

But...

He frowned slightly, looking at the "code lock" on the copper door.

It consisted of 10 digits, from 0 to 9.

Next to the code lock, there was a "confirm open" button. Clearly, only by entering the correct code could the copper door be opened. But what the code was, no one knew, as there was no hint around.

"..."

After pondering for a moment, Chen Mang said: "Zhang Damei, have all residents stop mining and return to the train."

"Yes."

Today was the first mining day for the 1,900 survivors who had newly joined the train. This group had fully understood the train's promotion mechanism, and they were just about to start mining to quickly earn the qualification for earning Fixed Star Coupons. But before they could dig much, they were called off.

...

Chen Mang maneuvered the train underground, heading toward beneath the "copper door."

As expected.

Upon reaching the area beneath the copper door, the drill seemed to hit an air wall. The display showed ordinary dirt ahead, but the Level 50 drill sparked fiercely, yet there wasn't a single mark of damage.

After circling around, he found the air-wall-encased strange find wasn't large, about the size of four refrigerators.

Not an interior space.

Just four refrigerators stacked together, roughly the size of a burial pit. If this was an Adventure Map, it was the smallest he had encountered. Forget about driving the train in; only two or three people could barely fit, and they'd have to go in horizontally.

If the shortcut wouldn't work, then breaking the code was the only way.

"Old Pig, find a brave one among the 1,900 survivors to input the code I give you. Regardless of whether it opens, they will immediately enjoy Level 1 resident privileges."

Chen Mang parked the train about a kilometer away from the copper door before giving the order.

He had a hypothesis in mind.

With no code hints, perhaps... the coordinates of the copper door might be the password.

After all, there were no other number-related hints, and the copper door bore no patterns suggesting it was for decryption.

Having many people was indeed beneficial.

Among 1,900 people, there would always be one unafraid of death.

Soon, a burly man jumped off the train, clipped the Mechanical Eye to his chest, and headed toward the copper door a kilometer away in large strides.

Chen Mang, sitting in the train compartment, watched the scene from the first-person perspective of the burly man on the screen.

The moment the coordinates were entered and confirmed.

The burly man hesitated not for a moment, turned, and ran. However... there was no explosion behind him, nor any disturbance. Upon receiving the command, the man mustered the courage to approach the copper door again.

He saw a line of words appear on the copper door.

"Incorrect password, 2 attempts remaining."

"..."

"Meeting!"

Chen Mang frowned and immediately called Li Shiji, Old Pig, Biaozi, and others to the train compartment for a meeting to crack the code. Although unknown what lay beneath, it was undoubtedly an opportunity. Having seen it, it was rightfully his.

Missing it would be a significant pity.

Once everyone was gathered.

Chen Mang scanned each face, while the screen displayed the exact image of the copper door: "This is the copper door. Two password attempts remain. If anyone has ideas, speak freely."

His gaze lingered on Li Shiji for an extra second.

His expectations for Li Shiji were high—perhaps Li Shiji could discern something.

Feeling Master Mang's intense gaze, a cold sweat appeared on Li Shiji's back as his eyes fixated on the copper door on the screen, finding it increasingly mysterious.

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