"This one does, which vent do you want?" Ye Tianji said, and immediately typed on the notebook again, and soon a few bright spots appeared on the perspective view.

"A few highlights at the entrance, the air filter, purifies the outside air. The large one in the center of the research institute is the air circulation filter, which purifies the air inside the research institute. Little girl, what are you going to do? ”

Gu Yunnian smiled slightly, pure and harmless.

"I have a potent drug in my hand, and the amount is enough in a confined environment to bring down the entire research institute, provided it is not filtered by an air filter."

The six of them suddenly gasped, although they knew that Gu Yunnian had been prepared and used the incense to put down the person who had captured her and escaped, but hearing this again still surprised them.

Several people glanced at each other, and Ye Tianshu said: "You can try this method, Xiao Nian, how long can the drug in your hand work, and how long will it work." ”

"Half an hour, at first, will only make people feel a little sleepy, no matter how strong your willpower is, half an hour is enough to fall asleep. There is no antidote, at least three days of sleep. ”

However, Gu Yunnian frowned slightly when he thought of the resistance shown by the two ghost-faced people.

"But these people in the institute are different, their bodies have a certain amount of resistance, and the effect may not last so long."

"That's enough!" Ye Tianshu said, arranging for Ye Yuheng and Ye Tianji to start.

After analyzing the system control of the filter, NightSky was pleasantly surprised to find that the filter screen of the filter was fully automatic and could be operated separately from the fan.

The vents were then screened, and a vent hidden in the middle of the river was chosen because some of the sensors had to be turned off.

This one vent is the most difficult to spot, and there are more creatures in the river, so the installation of sensor equipment is the least.

When they got to the vicinity of the vent, they saw that the vent had been built into an island in the river, and a mossy ground of less than half a square meter had emerged, and no one would have thought to go up and look at such a small area.

Nightshade first turned off the alarm, and then the control filter turned on.

Ye Tianshu stretched out his hand to Gu Yunnian, "Give me the drug, I'll put it!" ”

Rivers in the rainforest, more dangerous than forests, man-eating crocodiles, man-devouring pythons, and many other deadly creatures.

"Good!" Gu Yunnian obediently responded, first took out the antidote and let everyone eat one, and then took out the drug.

At this time, the rubber boat they brought by Ye Tianshu had been filled, and they held a rope tied to the tree on the shore, Ye Tianshu rowed to the vent, poured all the drugs into it, and made a gesture of completion to Ye Tianji.

Nightmitage starts the fan first, blows all the drugs into the ventilation pipe, and then closes the filter.

The filter of the central circulation filter was also turned off by the Night, and only the fan was turned on.

Then, he switched to video surveillance, and as the ten minutes passed, some people began to yawn, some were struggling, and some were going back to their rooms to rest.

Half an hour later, many people fell asleep, some were trying to cheer up, and some people noticed the abnormality and tried to resist pressing the alarm, but they all failed.

Ye Tianji switched the surveillance video in the research institute until everyone passed out, and then said, "It's okay." ”

Only then did they go to a hidden entrance, and directly violently cracked the code, and what they saw was a cold white, which made people feel uncomfortable when they looked at it.