Xiao Yi stood quietly on a high point, witnessing the apocalyptic horror, his eyes filled with deep worry. His brow furrowed, his lips pursed, revealing the heaviness of his heart. The scene before him was like a nightmare: the roars of the zombies, the trembling of the earth, and the desperate cries of the people intertwined, piercing his soul. He knew that every second, more innocent lives could be lost. Yet, deep within his anxiety, a resolute determination burned. He secretly vowed to build a safe haven for the survivors struggling on the brink of death. His eyes hardened, as if he had already seen a hopeful haven in the future. In his mind, he imagined the sanctuary: a sturdy wall to keep out the zombie invasion, abundant food and water to ensure everyone's survival, and warm shelter to free everyone from fear. Xiao Yi knew the task was immensely daunting, but he refused to flinch. He believed that as long as he had determination and courage, he would be able to create a blue sky for the survivors in the ruins of this doomsday, allowing them to feel the warmth and security of life again.

Xiao Yi closed his eyes and began to picture the base in his mind. His vision envisioned a base that first and foremost required a sturdy, tall wall. This wall would be constructed of the thickest metal, at least ten meters high, to resist the zombies' climbing and charging attacks. Watchtowers would also be placed atop the wall, equipped with advanced surveillance equipment and powerful firepower, allowing defenders to maintain a constant view of the surroundings and respond promptly to any threats. The entrance would be a heavy iron gate, accessible only after strict identity verification. Behind the gate would be a buffer zone, providing effective resistance should a zombie breach the initial defenses. The interior layout would be well-planned, with neat rows of simple yet comfortable housing providing a safe haven for survivors. Spacious warehouses would also be needed to store large quantities of food, water, and medical supplies. Xiao Yi also envisioned building an independent power station, utilizing renewable energy to ensure a stable power supply. Furthermore, a comprehensive sewage treatment system and ventilation facilities would be necessary to ensure a clean and well-ventilated environment within the base. At the center of the base, there should be a square, a place for everyone to gather and communicate, as well as a place for emergency gatherings and the distribution of supplies. In addition, Xiao Yi also planned to set aside an area for farmland to grow some easy-to-grow crops to achieve a certain degree of self-sufficiency. He continued to refine this concept in his mind, carefully considering every detail, because he knew that this base would be the last hope for the survivors and could not afford to neglect it.

Xiao Yi knew the challenges facing this base were immense. He envisioned a base with formidable defenses to withstand the frenzied attacks of hordes of zombies. The zombies surged like a surging tide, tireless and fearless. Therefore, the base's walls needed to be not only towering but also impenetrable. Constructed of the strongest alloy, they would withstand the zombies' frenzied pounding and clawing. The tops of the walls would be covered in sharp spikes and electric nets, effectively preventing any zombies attempting to climb from returning. Furthermore, the base's defenses needed to go beyond the walls. Entrances would require multiple checkpoints, including heavy steel gates, traps, and obstacles. Watchtowers would be evenly distributed with firing points equipped with the most advanced weaponry, enabling defenders to deliver a fatal blow to the zombies. However, simply resisting zombie attacks was far from enough. The occasional earthquakes posed a greater threat. The base's structure would have to be meticulously designed to withstand the violent shaking. The foundation must be extremely deep and solid, using earthquake-resistant building materials and a special structural frame. Each house must have reinforced support columns and buffer devices to reduce damage caused by earthquakes. Underground facilities must also be well protected, and storage warehouses and shelters must have sufficient pressure resistance to ensure that they can provide the last refuge for survivors in the most dangerous moments. Xiao Yi understands that any omission in any link may lead to the destruction of the entire base, and the lives of countless survivors will once again be in dire straits. Therefore, every detail of this base must withstand the harshest tests and become a truly indestructible fortress.

To achieve this daunting goal, Xiao Yi embarked on a perilous search. He traversed the ruins, searching every corner for survivors. His cries echoed through the empty, devastated city. Whenever he encountered a group of survivors, he eagerly inquired if they had any experience in construction or engineering. Sometimes, he was met with indifference and suspicion, but he never gave up. Finally, in an abandoned factory, he found a former construction engineer. His face was haggard, but his eyes still gleamed with professionalism. Xiao Yi was thrilled, as if he had seen a glimmer of hope in the darkness. Then, in a dilapidated residential complex, he discovered another survivor skilled in structural engineering. As if by fate, he met electrical engineers, hydraulic experts, and others. Thus, Xiao Yi successfully assembled a team. Its members came from diverse backgrounds and ages, but they shared a common goal: to build a safe home for the survivors. They came together, though in rags, filled with fighting spirit. Xiao Yi looked at them, and unprecedented hope ignited in his heart, as if he saw the bright future of the base gradually turning from a concept into reality.

After unremitting efforts, Xiao Yi led his team on a relentless exploration through ruins and wilderness. They tirelessly rummaged through abandoned factories, research institutes, and warehouses. During one perilous expedition, they entered a secret laboratory deep underground. The lab was filled with the stench of decay, and much of the equipment was damaged. However, in an unassuming corner, they discovered samples and relevant research materials. After careful study and analysis, Xiao Yi's team was pleasantly surprised to discover a new, unprecedented composite material. This material possesses exceptional strength and toughness, capable of withstanding immense pressure and impact. Its surface exhibits a unique texture and a subtle metallic sheen. The team members conducted various tests and found that it maintains stable performance in both high and low temperatures, and exhibits excellent corrosion and fire resistance. To further understand this material, they delved deeper into the research materials they discovered. The materials revealed that this composite material is synthesized from multiple rare elements and requires an extremely complex production process. This, however, did not deter them; instead, it fueled their passion and determination. Xiao Yi excitedly realized that this new composite material would be an ideal material for constructing base fortifications and buildings, bringing great hope to their base construction.

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