Zhang Chun pressed the disposable cup of water against the wall, carefully listening for any movements.

Zhang Chun's face changed greatly, he turned and looked at Lin Hui and Lin Xue, "Could it be that someone is digging a tunnel?

"

"That's right," Lin Xue nodded her head, confirming Zhang Chun's answer, "Furthermore, from the looks of it, they are not too far away from here, the enemy's target might even be the engine room! The other party clearly knows the address of the entire office building. "

"No, the enemy is clearly heading in this direction." Zhang Chun said with certainty, "Usually, there aren't many people in the engine room. Also, when I use the computer to calculate, it will inevitably make a huge noise, and can cover up the sound of the enemies digging."

"Oh right, how did you notice that?" Zhang Chun asked curiously.

Lin Xue explained, "The professor's research has reached a critical stage, and there might not be enough electricity, so we temporarily closed the room. As for me, I just happened to be on patrol and happened to hear a peculiar sound. "

"Now we can basically be sure that someone is digging a tunnel." Lin Hui immediately said, "We can get someone to check the underground passage. The enemy's underground passage should be leading from here to the nearest sewer."

"Moreover, it's already late at night. The other party is obviously trying to dig a tunnel in the middle of the night."

"I'll bring some people to take a look. Zhang Chun, you should also go back to the monitoring room and check the situation." Lin Hui continued.

Zhang Chun and Lin Xue immediately went to the monitoring room and sat down in front of the computer.

Lin Xue pointed to a spot on the monitoring screen, "This place is less than a hundred meters away from the computer room. If we start digging a few days in advance, without any heavy machinery, it would at most take a week."

Zhang Chun immediately dialed Lin Hui's number and told him the target, "There is still this matter, there is no need for our people to investigate. We just need to call the police and have them arrest us. "

Since this had been planned a few days ago, the plan to gather all the troops at a few points had not been discovered by the enemy and there was no need to expose it.

Right now, they could only rejoice over their good luck. Otherwise, it wouldn't be so easy to discover them. Once the enemy had dug the entire tunnel, a grenade would be enough to completely destroy the isolated engine room.

If the machines were destroyed, all the research would be wasted.

But was the enemy's plan that simple? Whether it was the World Tree Organization or the assassin's guild, they would not put all their eggs in one basket.

Sure enough, Lin Xue suddenly screamed out at the side, "Look at what this is!"

Zhang Chun immediately looked at the screen. The last time was when several black dots were flying towards the building at high speeds.

"It's the UAV." Zhang Chun was suspicious for a moment, but quickly recovered, "Damn it, they placed bombs on the UAV!"

"Hurry up and alert everyone!"

However, while Zhang Chun was still growling, these UAV s had already flown in from the open window.

Immediately after, the screen was filled with images of the explosion, followed by the sound of an alarm that resounded through the sky.

"What's going on?" Lin Hui, who had just arrived at the control room, was completely shocked.

Even the usually calm Lin Xue was nervously looking at Zhang Chun.

Zhang Chun quickly made arrangements, "Because our security personnel are rushing to the plane room!"

Zhang Chun explained: "The enemy is only here to attract our attention, to provide cover for their tunnel attacks! "Now, it seems that the enemy is going to launch an all-out attack!"

Who would have thought that the enemy would be prepared to destroy the research results at all costs!

Regardless of whether it was the assassin's guild or the World Tree Organization, once they decided to launch an offensive, they would not be so easy to deal with!

"There are probably a lot of enemies outside the office. Today, all the staff in the office building have to find a place to hide!"

Zhang Chun's face was terrifyingly gloomy. World Tree Organization was still alright, after all, he was familiar with the opponent's attacking methods. I'm attacking the hitman organization, and I'm afraid the innocent people here will be affected as well.

Now, the entire Military Engineering Institute had become a battlefield!

Zhang Chun turned on the safety on his gun, and smashed into Lin Xue and Lin Hui who were beside him, "Now that this place is really a battlefield, what we need to do the most is to overcome our fear!"

After all, other than Zhang Chun, everyone here had never been to a real battlefield before.

"Unexpectedly, Lin Hui only chuckled," As a soldier, I have long prepared myself to enter the battlefield. Death on the battlefield is also a good fate! "

"Moreover, this is our home ground. We have the advantage!" Lin Xue cheered from the side.

Zhang Chun nodded, "It's good that you have this aura. Security officers have been informed not to just keep a low profile and always be careful of the surroundings. Now that all of our surveillance cameras have been blown up, there's no other way around it.

"Right now, the most important thing is for every department to stay in touch, so that they can understand the situation here!"

"Understood!" Lin Hui immediately passed down his orders.

Explosions were still ringing outside, probably alerting the military. If they wanted to stop the enemy's sneak attack before the military's reinforcements arrived, then the winner would still be their side.

"Lin Hui, the two of you should stay here and continue to lead." Zhang Chun picked up his weapon, "I'll go out and take a look, I might not be able to find traces of the enemy."

"Can't you just let me go on a patrol?" Lin Hui said in shock, "You are the commander here after all. In this kind of dangerous situation, you should be the leader."

What a joke, Lin Hui was prepared to go out and start a massacre, how could he let the two people see him?

Lin Hui looked like he was prepared to advise again, but Lin Xue stopped him.

"Be careful." Lin Xue only warned Zhang Chun.

After he finished instructing, Zhang Chun quickly rushed to the great hall. This was the place where he had to go to, and it had to be his main target.

The glass doors at the lobby's entrance had been completely destroyed. There were glass fragments all over the floor. It seemed like the other party had used a large amount of explosives.

Zhang Chun was observing the situation, he did not expect another UAV to carry an explosive!

After a series of turns, the UAV flew towards Zhang Chun's direction!

Zhang Chun did not dare to face it head-on, because if he did, the unavoidable explosives would explode! He could only dodge!