Deep in the tunnel, the vibrations from the chisel strikes of the Puki shells never cease in the darkness.

A few Cow and Horse Puki collected the rubble on the ground and transported it outwards.

Because the tunnel is already several hundred meters long, the round trip takes a lot of time, so much so that the number of Cow and Horse Puki responsible for transporting the rubble now exceeds the number of digging Puki smashing the stones.

This has already far exceeded the Purple Crystal mining range, and all that is being excavated are worthless stones, but the Puki still work under orders.

Due to the distance, Lin Jun had no choice but to also lay the fungal mat inside.

To say this entire project is without profit is not an exaggeration at all.

But if in the end, the Underground City can be excavated, then it will all be worth it!

Clang—

Unlike the regular mining sound, it was as if it had struck something extraordinarily hard, and a Puki trembled and collapsed onto the ground—dead.

The enormous recoil destroyed its internal fungal filament structure, but the problem was minor; death is not the end.

Because these digging Puki occasionally injure themselves with vibrations, Lin Jun equipped them all with [Fungal Filament Reassembly Level 4], so that even if they're vibrated to death like this, as long as they are relatively intact, they can get back up to work after some recovery.

What caught Lin Jun's attention was, before it lies a regular rock layer, so why is there such a significant recoil injury?

Clang—

Just as Lin Jun was about to delve into research, the same sound occurred again, and another Puki trembled and slumped down.

Lin Jun immediately asked all the digging Puki to stop working and gather near the spot where the two Puki were vibrated to death, beginning a cautious and careful excavation.

It didn't take long before a "wall" was cleared out.

Though it is called a "wall," in reality, it's just like the rock anywhere else in the tunnel, seemingly without anything special, yet they are just too smooth!

It's not that they appear smooth, but the actual tactile sensation is smooth.

There's no unevenness at all; even when the Puki shell is pressed against it, there's no sensation of friction!

Simply absurd!

If one must describe it, it's like a very thin yet extremely sturdy transparent wall, separating the inside and outside.

This "wall" is different from the air wall Lin Jun encountered on the stairs before; the air wall feels like a spring, a force preventing you from advancing.

This transparent wall is different, absurdly hard.

To test the hardness of the transparent wall, Lin Jun even used the Mushroom Cannon and Self-Destruction, causing a small collapse and spending quite some time clearing the rubble.

Even so, the transparent wall didn't budge an inch.

Lin Jun even brought Xiao Hai over, asking her to try smashing the transparent wall.

One punch!

The transparent wall didn't move at all!

On the contrary, Xiao Hai, who's usually invincible, clutched her right claw in pain, rolling on the ground and emitting sounds so loud that they nearly caused another collapse.

Afterward, she hid in the Mushroom House, ignoring the Mushroom, leaving Lin Jun rummaging through the small treasury for a while. Not finding any ordinary gemstones, he had to choose a ring with Power+1 to give to Xiao Hai, restoring her favorability.

Since they couldn't dig horizontally, Lin Jun had the Puki change direction and start spiraling upwards.

This time, it didn't take long, and after another half a day's digging, with another trembling sound—the top was reached!

The height at this position is likely where the fourth and fifth layers meet.

So... was I living inside a big glass box?

Though I had long expected not to be able to dig out, discovering I live inside a big glass box felt quite peculiar, reminding Lin Jun of a petri dish from a previous life…

-----------------

United Kingdom Capital Oath City.

Within this royal city where every inch of land is priceless, there is an impressive yet sparsely populated building in the east—the headquarters of the Relic Association.

This building, over 300 years old, is constructed with white granite forming its main body, supplemented by wooden decorative structures, showing numerous traces of time.

In the noon sunlight, the entire building exudes a warm honey-colored hue.

A luxurious carriage pulled by four black horses stopped in front of the gate, its prominent emblem representing the family it belongs to.

Behind the carriage followed four mounted guards.

Eric handed the reins to the servant who approached, got off the carriage, personally opened the carriage door, and welcomed the young lady sitting inside down.

"Miss Inanna, Mr. Eric, welcome to your visit."

A staff member of the Relic Association, who had been waiting at the door, greeted them with a smile. Inanna looked at the insignia representing the scholar status on his chest and slightly bowed, performing a noble salutation.

Despite the "Hero Summoning" long being over, the aggrieved Demon Race's subsequent retaliations never ceased, and Inanna had thus been forced to stay at home for several months.

However, she didn't forget to help Lin Jun search for information on the Underground City.

This time, after much pleading, she finally obtained her father's consent to visit the Relic Association accompanied by Eric.

On the side, Eric naturally guessed that Inanna's purpose for coming here was probably related to the previous letter, and he had also sent people to inquire about the man named Dylan.

Though there are suspicious points, such as suddenly acquiring a substantial sum to purchase Rejuvenation Potion.

But it should logically have nothing to do with the young lady.

Eric judged that he might just be an intermediary, but he couldn't find out anything about the person behind him.

Recently, even Dylan has disappeared, so the investigation had to be temporarily halted.

Under the guidance of the scholar, Inanna passed through the hall and walked nearly ten minutes in a corridor, arriving at a library-like place.

"Level Two Reading Permission."

The scholar took out a document stamped with Duke Alama's seal and handed it to the elderly man guarding the door.

After a glance, the elderly man signed the document, allowing Inanna inside, while Eric remained outside as he was practically unqualified to enter—Level Two Reading Permission was granted to Inanna by Duke Alama.

It could even be said that if not for accompanying Inanna, he wouldn't have been able to enter the Relic Association headquarters.

"Miss Inanna, you applied to view materials related to the Underground City, is that correct?" the scholar walking in front asked gently.

Although he behaved like a genuine reception attendant, Inanna did not dare to be negligent, knowing that her magic teacher was merely a scholar.

"Yes."

The scholar led Inanna through three compartments to a row of bookshelves.

"This room contains all the information related to the Underground City, ranging broadly. You can choose to read them.

Because these are classified as 'secret' documents, you cannot take them out. Please finish reading them here."

Inanna first nodded, then gazed in awe at the entire row of bookshelves; she hadn't expected there would be so much!

She cast a pleading look at the scholar.

Seeing her expression, the scholar couldn't help but chuckle softly. After thinking for a moment, he stepped forward and said, "I personally suggest you start with this book."

As he spoke, he pulled out a book from the shelf: "The Structures of Underground Cities Beyond the Naked Eye."

If you find any errors ( broken links, non-standard content, etc.. ), Please let us know < report chapter > so we can fix it as soon as possible.