In the medical center building, Colonel Max paced back and forth. While reaching out for the communication headset, he said in a deep voice, "Each search group reports the situation." ”

"One group completed a predetermined target inventory and found no targets. ”

"The second group completed the task and did not find the target ......"

"Three groups...... No target ...... found"

Colonel Max's brow furrowed, and he asked in a deep voice, "How's the ambush point at the passage?"

"Report sir, we're still waiting for the target to appear. But so far, everything is working fine. The U.S. squad replied in a deep voice.

Colonel Max pondered for a moment, he knew that these mercenaries could not disappear for no reason, and now the entire medical center building had been searched, but it was still nowhere to be seen. Then there are only two possibilities: one is to follow the connecting passage between the two buildings and infiltrate the command center. The other is to withdraw from the health care centres, but not through the corridors, but to the periphery.

Max's initial judgment was that the infiltrators would follow their predetermined plan and take the connecting passage between the two buildings. Therefore, he secretly set up a heavy ambush, and as soon as these infiltrators pass through this passage, they will be surrounded in it, and it will be difficult to fly. What I didn't expect was that this group of people actually went against the norm and evacuated outward, where could they evacuate? How many other command centers? This also seemed unlikely.

Max was silent for a moment and suddenly came to his senses, and ordered, "They didn't give up, they will definitely find another way to infiltrate, we will withdraw from the medical center and search on both sides." Prioritize searching for areas that attract more attention and are less commonly used for ancillary facilities. Act now. ”

"Colonel, do you want to keep people here in the passage?" the American sergeant asked.

"The personnel here in the passage must not be evacuated, this is a critical area, continue to guard. Others, come with me. Colonel Max said in a deep voice. "Leave immediately. Most likely, they have already acted. Tell the surveillance department to pay close attention to the status of all surveillance camera facilities, and do not let go of any abnormalities. Our opponents are very good at infiltrating. ”

"Yes, sir. The U.S. sergeant agreed.

Colonel Max flipped through the map as he walked, "Here, and what is this place?" he pointed to two nearby locations on the map.

"One is the sewage treatment center and the other is the ventilator room. The U.S. military replied.

"Sewage treatment center and ventilation machine room?" Max muttered for a moment, "Let's go, let's go there first." ”

"Colonel, are we going to the sewage treatment center, or to the ventilator room?" said the U.S. military with a frown.

"There is no point in a sewage treatment center. Unless those people can turn into rats and run from the sewers to the command center. But the ventilation machine room is different, those ventilation ducts extend in all directions, and can theoretically lead to any part of the base. So they definitely went to the ventilator room. Everybody come with me. Max said in a deep voice.

Colonel Max led his men to the ventilator room quickly, he first raised his hand to stop everyone from moving, and after listening carefully to the movement, he raised his hand to make a gesture to count down. "Three, two, one! Turn off the lights!" As the lights dimmed, two American soldiers slammed down the door, and the other soldiers raised their guns from behind and rushed in. In the dark, the enhanced night vision devices on their helmets work extremely well.

"Safe on the right!" a U.S. soldier whispered with a gun. "Left Wing Security. "The back of the computer room is safe. Several U.S. soldiers breathed a sigh of relief and said, "Confirm safety, turn on the lights!"

The lights in the computer room were turned on, and eight ventilation units were working in the large computer room. There is nothing suspicious about that. Colonel Max walked over to check it out, and snapped, "Search this area and don't miss any clues." They're likely hiding nearby, checking all the vents. ”

"Colonel, here's a discovery. After a U.S. soldier inspected it, he said in a deep voice, "There is a ventilation duct here, the barbed wire fence on it has been removed, and there are footprints inside." ”

Colonel Max walked over, touched the footprints with his hand, and frowned, "The traces are very new. ”

"Colonel, could it be that they got into the pipe?" asked the U.S. military. "Shall we chase it in?"

"Chase how to chase these ventilation ducts go in all directions, and they're very narrow. Even if you chase them, you won't be able to catch them. Colonel Max said.

"Colonel, a couple of drawings have been found here. Looks like a drawing of a nearby ventilation duct. Maybe it was dropped by these people. "A soldier came up with a couple of drawings. Colonel Max frowned, "Since these drawings have been thrown down, it means that they don't pay attention to this, check and check, what are the missing places on these drawings?"

"There's a part missing, like a part of the command center. One soldier replied. Another soldier also turned back at the mouth of the pipe and said, "There seems to be a faint sound in here. ”

"There's a lot of rat activity in these pipes. It's not surprising that there's a bit of movement. The sergeant shook his head.

"But it doesn't sound like a rat or something, it's like the sound of metal colliding. The soldier wondered.

"There is no doubt that they must have wanted to enter the command center through the ventilation duct and perform the decapitation tactic on Herbert. Pull all of us back and go to the command center to guard every vent opening. And here is also a strengthened defense. Guard every exit, so that they can't get out at all. Let's catch turtles in an urn and see how long they can stay in this pipe. Colonel Max smiled coldly.

"Yes, Colonel. The U.S. lieutenant nodded, "This time, they will have to bear it." ”

Max whispered, "That's not enough, judging by their actions, this group of mercenaries is very experienced. You personally take two platoons of soldiers and escort the commander to his room and keep guard outside. ”

"What do you mean, Colonel?" said the lieutenant.

"Even if we do plug these people in the ventilation ducts. But it can also be prevented. What if these people rush out and fight us to the death?" said Max with a smile. "Their goal is to assassinate the Commander, so they're going to go for him. Now we transfer the commander back to his room. Then, even if these infiltrators rush out, they will get nothing.

I'm not saying they're going to be able to rush out, but if they can't take the risk, why should we take the risk? Command Herbert is called back to the room, and when we catch the intruders, he can come and see for himself. ”

"It's still the Colonel who is thoughtful. The lieutenant nodded.

"Go ahead and do it right away. Remember, be sure to guard every exit of this ventilation duct. If there is a shortage of manpower, all the people in other positions can be transferred to focus on defending the command center. I'm going to catch them all. Colonel Max exclaimed.