Second Floor! Ma Laogou's Invitation!

"A single Biological Virus completely breached the Sky Dome Barrier, causing humanity's supposedly impregnable defenses to crumble instantly."

"But based on the timeline of human migration to the New Continent, the Biological Virus didn't arrive until the ninth year."

"Now I have the complete viral vector, and so much time, Biological Virus."

"Nothing to worry about!!"

Thinking back to his previous two encounters with the Black Dog and Mad Cow in this ruin, Su Mo felt a sense of relief that he hadn't been bitten or scratched.

Meanwhile, thinking about the other Mutated Creature still trapped in the core of this ruin, Su Mo couldn't help but clench his fist and pound the ground, feeling lucky that he had come directly to Ma Fei's refuge earlier.

These living, Mutated Creature cannot die so easily.

In the face of future Biological Virus disasters, this could be a "treasure trove" that can be dissected and analyzed in advance!

Once a complete biological laboratory is established, the corresponding viral template can be extracted, and a serum antidote can be developed.

Biological Virus? That's not a problem at all. Even if the Biological Virus mutate several levels, nine years later, Su Mo is confident that he will have already established a complete prevention and control system. It's not impossible that he could even go "into the sky" and turn the creatures on the ground into idiots.

"Looking at it this way, the most important aspects of this level seventeen core are still the Sky Defense System and the viral biological template."

"As long as a real-world dome can be built, or even a replica, it's perfectly sufficient to withstand ordinary disasters."

"I have a system that can integrate and combine with other technologies to completely perfect the design concept of the Sky Dome."

After carefully putting away the Town Chief Handbook that recorded the operation of Liangfang Town and placing it in a location in his Storage Space that did not need to be moved, Su Mo stood up and began to carefully examine this room that might be hiding a treasure.

The Sky Dome's control system is located in the mayor's office.

Judging from the furniture arrangement on the first floor, this should be where Ma Fei usually handles government affairs. He would occasionally meet with others here to discuss matters related to the development of Liangfang Town, which is why the Town Chief Handbook is placed on the first floor.

But Su Mo didn't overlook any possible traces of information in the mayor's room. Starting from the first floor, Su Mo meticulously searched every nook and cranny.

Of course, there were also gains. Among them, Su Mo found two more letters used for the handover of supplies and extracted an important piece of information.

The coordinates of Hanwu City, where transactions were conducted in Liangfang Town, and the coordinates of Yangliu City.

"Currently, for some unknown reason, the core of Liangfang Town has revealed its ruins in my depression."

"But its true prototype should be at the wasteland coordinates indicated by the system."

"If I could pinpoint the exact coordinates of Liangfang Town, and find a way to mark it, perhaps I could trace the locations of these two cities after reaching the New Continent."

Similarly, after putting the two letters containing the coordinates back into his Storage Space, he beckoned Moore to the iron gate between the first and second floors, and the first challenge was finally placed in front of Su Mo.

Even if Ma Fei is weak, he's still a level 17 expert. Even if Yan Country's Technology Tree is crooked, it has still developed a good method called the Sky Dome Barrier, which is specifically used to avoid disasters.

If the first floor is a reception room that seems completely undefended, then this heavy iron door on the second floor is a necessary step to unlock the "treasure".

Su Mo tried knocking on it, but hearing only a heavy, inaudible sound, he was at a loss.

This iron gate, which is more difficult to deal with than the stone gate of the Underground Shelter, is estimated to be at least ten meters thick, belonging to the physical material stacking disaster avoidance method.

Without proper equipment or corresponding attack methods, this single door alone can stump countless people.

Using such a simple and brutal method to serve as the first line of defense for the shelter, it has to be said that Ma Fei is quite the cunning old fox.

As for breaching the outer perimeter of the small building, they would use explosives to enter.

Thinking this, Su Mo stepped outside the first floor and began to carefully examine the main structure of the entire building.

Four stories high, not tall, only about twelve meters, the height of three Shelter Core stacked together.

However, this small building has one extremely peculiar feature. Based on the construction standards of a single-story building, the outer wall of this small building should be about ten to fifteen meters thick, which is within the range that would be difficult to demolish even by explosives.

Moreover, even if they could blast it, what if they ended up with a 100-day penalty, or it was considered an offense against the town mayor? That would be a disaster.

"How about we try blowing it up from inside the building?"

Unable to rouse them from the outside, he went back inside and, looking at his remaining Time Currency, Su Mo dismissed the dangerous idea.

Leaving is impossible.

But if I don't take it, wouldn't this trip be a waste?

Since the computer is gone, maybe we should grab something else this time, or learn some other information.

This is like entering a treasure mountain empty-handed; it's a huge loss!

"What's a good way to break through this iron gate and get to the second floor using the conventional method?!"

"Chemical?"

"Drill?"

With twenty hours left, Su Mo simply sat down by the window, glanced at the blazing sky, closed his eyes, and pondered how to break through.

It's not impossible to chemically corrode iron, but the most important raw material is something we don't have at all.

Drilling is even less reliable; targeted blasting would be more realistic.

From a modern perspective, Su Mo was somewhat at a loss when faced with a solid iron security door that was more than ten meters thick and had no key!

Moore, who was standing nearby, also noticed Su Mo's iron gate.

From the perspective of Thunder Bear Warrior, they wouldn't even consider how to sneak in.

Spitting out two mouthfuls of saliva and rubbing his hands, Moore sat down in front of the iron gate and began shoveling with his Three-Pointed Double-Edged Blade, making clanging noises.

Unfortunately, each shovel strike only produced sparks; the iron gate remained unmoved! "Moore, stop shoveling! You can't dig any further!"

"Holy crap, I've fallen into a cognitive trap!"

"I can use magic to fight magic!"

The heavy iron gate seemed impossible to breach with ordinary tools, but with a thought from Su Mo, a finely crafted Iron Pickaxe appeared in his hand, and everything seemed to become simple.

The quality of iron is 3.

The special effect of a high-quality Iron Pickaxe is that for materials of grade 5 or lower, there is a certain chance of producing a shattering effect upon a critical hit.

Once triggered, the outer Iron Block will crumble like tofu. With continuous hammering, it can reach a height of ten meters.

Even if it's only fifty or sixty meters, Su Mo is confident he can dig it through today!

"Moore, Moore, you're such a clever little devil!"

Patting Moore on the back and seeing the latter's bewildered expression, Su Mo laughed and went to the wall next to him to try it out first.

Sure enough, the wall's material grade was determined to be 5 or higher. Even when the Iron Pickaxe triggered the special effect, the wall remained completely still except for the wall plaster falling down.

"It seems like trying to exploit a bug to get there won't work; we'll just have to dig it out step by step!"

It takes five minutes to hit a wall with a pickaxe, but twenty minutes to hit an iron gate.

One day's Time Currency can leave 72 pickaxes on the iron gate.

To save money, Su Mo simply took out a unit of Iron Block from his Storage Space and began to slowly tap it.

The light from a critical hit with Iron Pickaxe is very obvious. In addition to the burst of light from the pickaxe head, the hand holding the pickaxe can also feel a unique power.

Whenever a critical hit is triggered, Su Mo raises his hand and smashes his pickaxe against the iron gate, bringing down Iron Block about the size of a human head.

This is a task that requires patience, but fortunately there is still plenty of time. Su Mo is not in a hurry. When he gets tired of knocking, he sits down to rest for a while, drinks some water, and eats some dry food.

After a good rest, it's time for another round of hard work.

"As expected of Old Gou, a two-meter-thick iron door must weigh at least twenty or thirty tons."

"An ordinary residential building simply couldn't withstand this weight. To build so many layers, judging by the width of the outer walls, there must be at least ten layers. You truly are a kindred spirit!"

The main structure of the shelter is made of an unknown material, but its load-bearing capacity is terrifying.

Having Time Currency a day and a half breaking down two doors that were over two meters thick, Su Mo marveled at the sight of another level appearing, gaining a basic understanding of the seventeenth level.

The 4.2-meter ceiling height created by the system provides ample space for creative designs.

The first floor is 2.4m high, and the iron gate adopts a corridor design. After digging through two passages, Su Mo realized that he had only risen half a meter in height.

At this point, regardless of how demanding the upgrade conditions are, the sheer awareness of survival is something worth learning.

This time when I went back, I upgraded all the materials of the Underground Shelter after arriving in the New Continent, and even made the entrance door this thick! After knocking for another two or three hours, I opened the panel and found that there were only twelve hours left. Su Mo did not rest, but took out the Shan Hai Painting card to restore his stamina and continued to dig forward.

There is an ancient story of the Foolish Old Man Who Moved Mountains.

Now there is Su Mo who chiseled a door.

Countless shards of Iron Block were dug out, and then Oreo pushed his homemade cart over into the yard.

Old lady DouDou, upon seeing another Oreo, stayed by her side, chattering incessantly.

What others considered extremely dangerous ruins became a unique labor conference for Su Mo.

Keep digging, and whenever a critical hit is triggered, Su Mo swings it at the iron gate next to him.

Repetitive mechanical labor lasting for more than ten hours is extremely mentally taxing.

Fortunately, Su Mo, who had lived in the wasteland for a month, had developed much greater endurance and managed to pull through.

Clang! Buzz. Another skillful critical strike landed beside him with a pickaxe, but this time, a slight smile finally appeared on Su Mo's face, which was covered in gray and black.

The iron gate finally made a sound!

The sound indicates that what lies ahead is no longer a passageway, but rather an open area, creating an echo! At this rate, it will only take a little over an hour of digging to break through this passage!

With a goal in mind, Su Mo felt as if an endless stream of power was flowing into his body from all directions, and his dormant brain was as if it had been injected with a spring of life.

Crouching slightly, Su Mo suddenly increased the speed of the Iron Pickaxe in his hand, even causing sparks to appear on the already deformed Iron Block.

Thump! Thump! Thump! Pickaxe after pickaxe, iron filings fell from the iron gate and were dug out by Moore with his bare hands, leaving Su Mo as much space as possible to dig.

Finding a spot, Su Mo, with his head covered, began to swing wildly.

Finally, with six hours left in the countdown to the ruins, there was a loud crash.

The door collapsed!

Countless dust particles were kicked up at that moment, accompanied by the dull echo of the Iron Block falling to the ground.

Despite his immense joy, Su Mo cautiously rested for half an hour in the darkness of the room, ensuring that his mind and body were fully recovered before summoning the Tibetan Mastiff Dou Dou.

"Be careful once you're inside. If there's any danger, come back immediately!"

Patting the silly dog's head and looking at its obedient appearance, Su Mo bent down slightly, ready to run away at any moment.

There are hundreds of engineering robots on the first floor. If the expected attack robots are indeed on the second floor, even if Su Mo had a hundred times the courage, he wouldn't dare to confront the mysterious technology of the future head-on.

Fortunately, the expected attack did not occur. As DouDou stepped into the second floor, a strong light suddenly burst from the ceiling, illuminating the entire darkness.

Having been accustomed to darkness for so long, the sudden burst of light caused Su Mo to involuntarily close his eyes.

However, just as Su Mo had reacted and had not yet had time to retreat, a deep male voice rang out in the shelter.

Welcome, newcomer.

Welcome to my shelter!

"Come in. Now that you've passed my first test, you're qualified to know something!"

The male voice seemed to possess endless charm, causing Su Mo to stop in his tracks the moment it rang out.

Humans?

No, is this Ma Fei?

Is this Ma Fei, the mayor of Liangfang Town?

Filled with curiosity, Su Mo tentatively peeked his head out of the iron gate. Then, Su Mo saw the most shocking scene he had ever witnessed since the beginning of time: on the second floor, there was not only the high-end desktop computer he had been longing for, but it was also piled up in the corner like clutter.

There are also transparent pipes with a diameter of one meter, densely packed on the ground like blood vessels, transmitting water-like energy that has been materialized into a dark blue color.

At the far end of the line of sight, there was an entire wall made up of the small robots we had seen before.

Unlike the previous engineering machinery, these little figures had nothing in their hands and appeared to be in a dormant state, allowing energy to be applied to them, emitting mysterious phenomena like ripples on water.

But none of this could attract Su Mo's attention.

Because, in the center of the room, there was a large cube, at least 4m x 4m in size.

Su Mo was familiar with this thing, and he had even seen it in a dream recently, and had longed for it in the dream.

"Very good, Vertical Missile Launching Device. I admit, I'm really tempted this time!"