The reserved space was quite large, comparable to a spacious apartment or townhouse in the city.
There were three bedrooms: one served as the master bedroom, while the other two were reserved for potential future members.
Humans are social creatures.
In a bustling city, loneliness might go unnoticed, but in the quiet isolation of a shelter, it would gradually accumulate until it became an unbearable weight.
For this reason, despite the potential risks, Su Wu knew he would eventually need to accept others into the shelter.
The entertainment room was designed entirely around his personal interests. It was equipped with game consoles, a high-performance computer, a large-screen TV, speakers, and a treadmill, covering everything from gaming and movie-watching to exercise.
If not for the likelihood that the internet would be disconnected after doomsday, the entertainment setup alone could keep him occupied for years.
Other spaces, such as the living room and dining room, were functional and straightforward, fulfilling their intended purposes without much to elaborate on.
Beyond the living quarters, the control center served as the shelter's command hub.
Inside, Su Wu had installed an upgraded high-energy battery pack, a laptop with computing power comparable to a small supercomputer, and control terminals connected to the shelter's surveillance system, as well as the monitoring system in the farmyard above.
From here, he could oversee the shelter's surroundings at any moment and remotely control the engineering team and all networked equipment.
As his survival points accumulated, he planned to further reinforce the control center, turning it into a highly secure fallback zone—a shelter within the shelter.
Adjacent to the control center, near the living area, was the mechanical manufacturing center.
In the future, this space would house a small processing machine, a 3D printer, a full-time engineering robot, and a warehouse for rare materials. Once fully equipped, it would be capable of producing most small mechanical components and equipment.
Currently, Su Wu could upgrade any mechanical device using survival points, but the process was inefficient—expensive and limited in output. With a well-equipped manufacturing center, he could produce affordable finished products in large quantities, provided he had the necessary blueprints and raw materials.
Positioned on the far side of the shelter, away from both the control center and the manufacturing area, were the storage room for daily necessities and the water storage tower.
The storage room held essential supplies, including food, medicine, sugar, fertilizer, toilet paper, detergent, clothing, and footwear—essentially everything Su Wu had previously stored in the two-story house above ground.
The water storage tower, a large reservoir, was designed to store and distribute purified groundwater.
It also functioned as an emergency water source.
If groundwater ever ran dry and no alternative water source was available, the reserve in the tower would be enough to sustain the shelter for at least a month.
With the completion of the second underground level, the shelter would be fully functional, capable of supporting long-term habitation.
Any future modifications would be enhancements rather than necessities.
Su Wu closed the window, pulling himself out of his thoughts.
Even after being open for just a short while, the intense heat from outside had already left his forehead damp with sweat.
On June 11, the main construction and furnishing of the second underground floor were finally complete.
All valuable belongings from the two-story house in the courtyard—including those from Su Wu's original bedroom—had been moved into the shelter.
With everything relocated, he naturally moved in as well.
In the shelter's living area, a soft white light, powered by survival points, illuminated the ceiling above him.
The humid, stifling air instantly became crisp and refreshing, as though he were standing in a lush forest on an early summer morning.
This was the effect of the upgraded air circulation system and central air conditioning.
Both systems automatically monitored air quality and temperature, maintaining the most comfortable conditions possible.
The air he was breathing now was no different from the fresh, clean air of an unpolluted forest.
Of course, if he wanted, he could adjust the settings to mimic an ocean breeze, a garden atmosphere, or any other preferred environment.
"This upgrade cost me 20 survival points," Su Wu thought to himself, feeling a twinge of regret as he glanced at his dwindling reserves.
Aside from upgrading the extreme drilling machine, this was the most expensive expenditure he had made since acquiring the survival system.
Making structural changes to the shelter—even modifying a single subsystem—was clearly far more costly than minor upgrades.
Still, this investment was necessary.
Air circulation and temperature control might seem trivial, but they played a crucial role in survival and quality of life within the shelter.
Take the wildfire he had seen two days ago—if the shelters in the affected area lacked proper air filtration, toxic smoke would have quickly filled the interiors. If their central air conditioning systems weren't designed correctly, or if their heat dissipation units were exposed outside, the shelter's internal temperature would rise uncontrollably.
The combination of suffocating heat and poisonous air would turn the shelter into a sealed furnace of death. Survival would be nearly impossible.
Su Wu spent a few minutes testing the air purification and temperature control functions.
Once he confirmed their reliability, he left the living quarters and stepped into the control center.
The control center was sleek and futuristic, dominated by silver-white tones.
On the wall opposite the entrance, four massive screens stretched across the entire surface.
They had already been connected to power, displaying live feeds from the 96 surveillance cameras installed throughout the shelter and its surroundings.
At the center of the room, in front of the monitors, stood a milky-white control console with a minimalist yet high-tech design.
Its centerpiece was a curved 40-inch screen, positioned above a glossy, glass-like control panel embedded with various functional components—keyboard, mouse, fingerprint scanner, document scanner, emergency switch, and more.
Through this console, Su Wu could link to his upgraded laptop and control all the electronic systems within the shelter.
For now, the shelter's automation was still incomplete, so there weren't many active functions to manage.
At this stage, the control console was more of a symbolic addition than a fully operational necessity.
The cost of manufacturing this unit had been five survival points.
Considering the current state of the shelter, it was a bit of a luxury.
However, the advantage was that it had been built to its highest specifications from the start—meaning it would never need an upgrade in the future.