After smoothly passing through the wire fence, the squad stopped advancing and scattered and crawled on the ground. Because further forward is an open area about 300 meters, and further forward is the headquarters of the secret society. This open area has been thoroughly cleaned up, there is no grass growing, no shelter at all, and no one is sure that it can pass safely.

Lin Rui whispered, "Stop the action and enter the surveillance and observation mode. Pay attention to the collection of enemy posts, including fixed posts, dark posts, and patrols."

"Understood." The team members responded via wireless communication.

Lin Rui checked the time and pressed the communication headset to contact Sergey who had sneaked into the Federal Building alone, "Russian, what's the situation with you?"

"I have entered the federal military building. It is fairly safe here. The security level is only above the middle level. It is incomparable with the secret agency headquarters you are going to sneak into. It can also be seen that the secret agency does not care much about these federal forces. People. I'm currently entering the office of the Deputy Minister of the Federal Republic. Once there are relevant gains, I will notify you via wireless communication." Sergey replied in a low voice.

"Understood, pay attention to safety." Lin Rui whispered.

Squatting and monitoring is a very boring and unbearable thing, but it is absolutely necessary at the moment. Lin Rui and others can judge the approximate situation of the enemy’s fixed post based on experience, but the law of action for the secret post and mobile post That said, it is not so easy to judge, so it can only be determined by patiently waiting and observing.

After all, night duty requires a high degree of concentration, so the more important the position, the less time on duty will be. Because the sentry is also a human being, it is easy to get tired with a high concentration of energy, and a tired sentry can hardly handle important tasks. Therefore, the sentry must be replaced in time to maintain vigorous energy. And some secret sentries that are not usually noticed are also the easiest to find when the sentry is handed over.

After boring and long hours of observation, each team member summarized what they had detected to Lin Rui. They found a total of six bright guards at fixed locations and four secret guards. In addition, the routes and movements of the three groups of patrol personnel in the surrounding area were mastered.

"It seems that their time for changing guards is staggered. The patrol team's inspection time is also not fixed." Lin Rui whispered, "This is difficult."

"Not only that, there is a hidden sniper on the top of the building." Yelena put down the telescope in her hand, "It's quite professional, because the observers around him are using a new type of equipment. A high-performance electronic telescope with a small computer can be The field of view in the sniper’s scope is also displayed on the telescope, so that the observer can instruct and check the target at night. That kind of telescope is so special that I can recognize it at a glance."

"We can only wait." Lin Rui whispered, "I don't know what happened to Sergey." The team is currently blocked, and there is no news from Sergey, but time continues to pass. This made Lin Rui a little anxious.

However, his anxiety was quickly relieved. Sergei sent back a message a few minutes later, "I have checked the possible meeting location. They usually hold meetings in the meeting room on the sixth floor of the North District of Building A, but This real confidential meeting is usually held in the basement of the north area of ​​Building A."

"Good job." Lin Rui whispered.

"There is even better, you wouldn't think of this. There is a dedicated passage under the Federal Building that can reach the north area of ​​Building A. It should have been a dedicated passage for secret meetings between federal leaders and secret service officials. I found a schematic diagram of the basement under the stairs here." Sergey whispered.

"Are you sure?" Lin Rui frowned.

"I'm right at the entrance, but after this passage was completed, it happened to be a fierce battle between General Logan's Northern Alliance and the Federation. Due to an air strike by the Northern Alliance, a missile hit the ground not far away, causing an underground passage to appear. It collapsed. So for safety reasons, the interior has now been blocked by two brick walls." Sergey whispered, "But the entrance is still there. Later, the person in charge of the project was arrested for this reason and accused of embezzlement. And was shot for dereliction of duty.

These were the things before the headquarters of the secret agency moved here, so after the headquarters of the secret agency moved here, the passage has been blocked by masonry and no longer exists. It is estimated that not many people know the location of this closed passage. "

"You mean..." Lin Rui whispered.

"I mean if you think there is no chance on the ground, you can use the underground passage to bypass the defense from under the Federal Building. Of course, we have to do a little bit to push down the brick wall blocking the passage." Sergey whispered. .

Lin Rui thought about it for several minutes, and whispered, "No, if that's the case. I have a way. I will let Viper and Sausage pass and let them help you get through that road, but rely on the secret agency headquarters. Don’t destroy the brick wall at the end. We must keep it as a safe passage for evacuation.”

"Then how do you complete the infiltration?" Sergey asked in a low voice, "I know the defenses there. It's not easy to get in from the secret society."

"I don't need to go in from there." Lin Rui whispered, "If they are meeting in the basement, I can sneak directly into the basement through the ground vents."

"But their vents are so narrow that even the cat can't get in." Sergey whispered.

Lin Rui replied, "That's just a superficial phenomenon. Although the secret agency made the periphery of the vent so narrow. However, the ventilation equipment, ducts and fans in the large basement all have fixed specifications and international standards. Even if it is stronger than the secret agency, They will not specifically produce a set of brand-new fans and matching ventilation ducts for a basement.

So on the surface, the vent is very narrow, but it is still a conventional ventilation duct specification, which is enough to accommodate a person crawling in the duct. All I have to do is to avoid the narrow entrance of the ventilation duct and re-open the opening with thermite in other parts of the duct. Leave two players with strong soil work skills, as long as they excavate and let me sneak in, and then backfill the soil, they can be concealed enough. "

"Are you sure?" Sergey whispered.

"The problem is not big." Lin Rui whispered. "From here, we can see the air intake of the ventilation duct. From this we can judge the approximate direction of the ventilation duct. The buried depth of the duct should be about two meters. Finished, they dug out the ventilation ducts, I melted the walls of the ducts with thermite, and then sneaked into the ducts. After the others backfilled them, they rushed to the Federal Building to meet with you, ready to pick me up when things are done."