What's particularly terrifying is that these zombies possess an almost obsessive thirst for blood. They can smell the faintest scent of blood in the air and frantically track it down. Once they find the source of blood, they recklessly pounce on it, biting with their sharp teeth and tearing with their rotting hands until their thirst for blood is satisfied.

This valley seemed to have become a paradise for zombies and a nightmare for humanity. Whenever night fell, the deep roars and howls echoed throughout the valley, as if telling the world: This is the territory of death.

Humanity was forced to hide in underground shelters to survive. In the shelters, people thought they had escaped the extreme threats of nature and could rest easy. However, they did not realize that a greater danger was quietly approaching.

Inside the shelter, every necessary living facility is available, and people repeat their monotonous daily routines. They no longer need to worry about extreme heat or cold, as the shelter's technology can regulate the internal environment to maintain a comfortable and pleasant environment. People gradually forget the dangers of the outside world and immerse themselves in the relative safety of the environment.

However, as time went on, problems within the shelter began to surface. Resources began to become scarce, the power supply became unreliable, and food and water became increasingly scarce. People began to argue and even clash over limited resources. The once united community began to fracture, with some seeking new paths and others wishing to remain in the shelter.

At the same time, the shelter's technological systems began to malfunction. The equipment that was supposed to regulate the internal environment began to fail, and the temperature and humidity gradually became uncontrolled. People began to feel uneasy, but they still held on to hope that if the equipment could be repaired, everything would return to normal.

However, a greater crisis is quietly approaching. The entrance to the refuge has been overrun by unknown creatures, seemingly adapted to the extremes of the outside world, becoming incredibly powerful and ferocious. The people try to resist, but soon discover that these creatures are not only numerous but also difficult to deal with. They begin to realize that they may never return to the world above ground.

In this perilous refuge, the inhabitants begin to re-evaluate their survival. They realize that only by uniting and facing challenges together can they find a new path forward. They diligently repair equipment, search for new resources, and battle the creatures that have taken over the entrance. While the road ahead is filled with unknowns and dangers, they are ready for even greater challenges.

The night was as dark as ink, the stars were hidden, and the wind was cold. Xiao Yi, a battle-hardened agent, donned a specially designed extreme cold weather suit and quietly infiltrated a secret base in the United States. His gaze was firm, his steps steady, each one carefully calculated to avoid triggering any alarms.

The US base is located on a desolate snowy plain, surrounded by high walls and densely packed cameras, with strict security measures. However, for the experienced Xiao Yi, these are challenges he must overcome. He goes deep behind enemy lines to uncover a conspiracy that concerns global security.

The patrol car slowly approached, and Xiao Yi held his breath and quickly and accurately hid under the car. His heartbeat was as rapid as a drum, but he forced himself to remain calm. He knew that the slightest mistake might expose his whereabouts.

As the patrol car drove in, Xiao Yi was led into the base. He clung to the bottom of the car, feeling every bump and turn, while keeping a close eye on the surroundings. Various possible scenarios and response strategies flashed through his mind, ensuring he could make the right choice at the critical moment.

Finally, the patrol car stopped in a secluded corner. Xiao Yi quickly and cautiously got out from under the car, looked around, and after confirming that there was no danger, he quickly blended into the shadows of the base. He knew that every step forward was crucial, and he had to be careful and not make any mistakes.

Xiao Yi's actions were like a carefully woven dance, each movement full of power and rhythm. He shuttled through every corner of the base, collecting intelligence and searching for clues. He knew that every effort he made was to expose the hidden conspiracy and protect the safety of the country and the people.

The night deepened, and the cold wind still blew. But Xiao Yi's heart was filled with determination and faith. He knew that no matter how difficult and dangerous the road ahead was, he would go on without hesitation until the final victory.

As Xiao Yi entered the American base, he couldn't help but be amazed at its complexity. This base didn't seem like a makeshift facility, but rather a deep underground labyrinth meticulously planned and constructed over a long period of time. He wandered through the vast corridors, his gaze filled with sturdy concrete structures and intricate piping systems.

As he went deeper, he discovered many hidden rooms and warehouses filled with various unknown equipment and supplies. These facilities seemed to be in good order, and it was obvious that there was a strict management and maintenance system. Xiao Yi realized that this base was not only large in scale, but also fully functional, enough to deal with various possible emergencies.

He continued along the passage, occasionally encountering patrolling soldiers and surveillance cameras. With his rich experience and superb skills, he cleverly avoided all possible surveillance and inspections, quietly penetrating into the core area of the base.

During this process, Xiao Yi couldn't help but develop a strong interest in the history of this base. He speculated that this base might have been converted from an underground air-raid shelter built by the Japanese long ago. This idea strengthened his determination to expose the conspiracy behind this base and contribute his own strength to the security of the country and the people.

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