Perhaps it was the death of the three soldiers that gave the base a warning, and the base really died down from that day, temporarily stopped exploring the city, and began to issue various missions, and at the same time they also took the initiative to send a team to find and clean up the possible spiritual zombies around the base.

And a few days later, the base announced to residents that it could produce its own purified water for sale, which was a third of the price of bottled water. Because some people are not worried about the safety of this pure water, the base has also taken the initiative to announce the manufacturing process for this purpose. The purified water is made from deep well water, which is treated by pure water equipment and then distilled before being finally made. For ordinary people who are often in contact with zombies, even if there is still a little zombie virus left in this pure water, it will not be more harmful than direct contact with zombies, so it is completely impossible to infect living people.

Although the energy consumption of this kind of pure water is high, and it is reasonable that its price should not be much lower than that of bottled water, in the eyes of the base, it is the most reliable source of drinking water after all, except for water powerhouses and water stocks. When the bottled water supplies run out before the end of the world, this set of equipment can also ensure that everyone will not die of water and thirst all at once. Therefore, even if it is necessary to pay more for this in exchange for energy, the base must create more pure water reserves as soon as possible for use.

According to Zhou Beichen's recollections, in his previous life, the base did not make such changes, but has always focused on the exploration of the city, and has never sold such a thing as pure water. He still vaguely remembered that it was probably after entering April, the danger of spiritual zombies began to gradually appear, and after several successive squads that went out to do tasks were wiped out, the base began to turn around and deal with it busily. It's just too late, the base is still besieged by the spiritual zombies that are gradually gaining wings, and the city is ruined.

According to Zhou Beichen and Qin Qin's analysis, the only difference between the two lives is the pure water launched by the base, which can also be attributed to the equipment they brought back. Perhaps for various reasons, several teams sent to that small pharmaceutical company were unsuccessful in bringing back the equipment, and the manufacturers and companies in the city that had similar equipment could not reach it for various reasons, or the equipment there was damaged.

After a series of coincidences came together, the base of the previous life did not get enough drinking water reserves after all, so it had to continue to risk attacking the city, so that it was forced to ignore the potential threats in the surrounding area, and finally ended up in a dismal ending.

But this life is different. At first, the stubbornness of the base also annoyed Zhou Beichen, and he had a feeling that he had the intention to kill the enemy, but he was unable to return to the sky. However, with the experience of the team led by Liu Chenggang being attacked and the previous team that disappeared as a warning, the base, which was no longer too worried about the material reserves, still took the initiative to deal with the surrounding spiritual zombies.

Zhou Beichen felt that the fate of the base in this life would be at least much better than in the previous life, at least many people would not have to die.

The days slipped by like water, and soon it was April. The base spent the whole month of March in a vigorous search for spiritual zombies, and casualties were inevitable, but the results were also quite gratifying. According to the estimation of the base, there are about 200,000 zombies in the southern suburbs where the base is located, and among them, the zombies of the ability type account for less than one-twentieth, and the spiritual zombies are even rarer, probably only about a hundred.

Among them, there are naturally the most spiritual zombies in the first level, and there are many fewer in the second level, and no one has seen it at all. There were a total of thirty-two spiritual zombies exterminated in March, although most of them were first-level spiritual zombies, but on the whole, this operation had killed at least about one-third of all the surrounding spiritual zombies, which was quite exciting news.

Since the spiritual zombies have the behavior of dividing the territory, there will not be a situation where several zombies are crowded together. In the few blocks closest to the base, the base will send people to patrol every day to ensure that no mental zombies can get close. At a slightly distance, the team that received the patrol mission issued by the base also shuttled endlessly every day, gradually expanding the control scope of the entire base.

For an ordinary team, the first-level spiritual zombies can still be dealt with, and it is very difficult to run even if they want to run when they encounter a second-level one. However, due to the records made when receiving the mission, even if the team is unfortunately wiped out, the location will be immediately raised to alert level, and more and more powerful teams will be sent by the base to check the situation.

According to this process, although the casualties of the ordinary squad receiving the base mission are not small, the security around the base has also been greatly improved. At least in April, there hasn't been a sudden disappearance of many teams in the base as in the previous life. Zhou Beichen and Qin Qin initially thought that there might not be any more zombie sieges in this life, and they were both happy about this, but also worried about how to encourage the other teams to go to the capital base together after May.

But what should come will come eventually, and after entering mid-April, more than a dozen spiritual zombies of at least the second level appeared at the outermost part of the base's control range, and they continued to approach the base.

Qin Qin and Zhou Beichen looked at the dozen or so tasks hanging in the most conspicuous position in the task collection area, and smiled bitterly at each other.

After pulling up the two teams of Zhang Hao and Zhang Ming, and making an appointment with the other two more ordinary teams that temporarily sought to form a team, the group took the task and set off immediately. If you want to deal with the spiritual zombies in the heyday of the second level, forty to fifty people is the lowest standard, if it weren't for the fact that three of these five teams belong to the top combat power in the entire base, the ordinary team must have at least seventy or eighty people or even hundreds of people before they dare to give it a try.

Just the dozen or so spiritual zombies that appeared as the vanguard force, the entire southern suburbs base had to use more than half of its top strength to compete with it. If it weren't for the fact that the base took the initiative to eliminate one-third of the surrounding spiritual zombies in advance in the last month, it would have greatly slowed down the opponent's attack.

Qin Qin sat in the car, looking at the various scenes that gradually glided by outside the window, thinking about the sudden attack of more than a dozen spiritual zombies, and a bad premonition gradually surged in his heart. I'm afraid that under the obstruction of the base, the third-level spiritual zombies have been born after all, otherwise in the absence of restraint, these second-level spiritual zombies would not attack the base so neatly.