Feeling that the people under his hands were struggling strongly, he reached out to touch the gun, Xue Lang listened attentively and pointed at his acupuncture points, and slowly put it down, but he still didn't dare to pull out the ronin knife to avoid the smell of blood being discovered by the enemy.

Listening quietly, there was no special reaction in the cave.

How can you come and return empty-handed!

Xue Lang's eyes were empty, he glanced at the exhaust fan, quickly took out the ylang-ylang incense and opened it, held down the nozzle, and a thick mist sprayed towards the air inlet of the exhaust fan.

The whirring sound of the wind, the slight vibration of the machine, obscured the sound of the spray, and a strong aroma was quickly swept away by the strong air current, and it was continuously sucked into the air vent.

Xue Lang wasn't sure how large the ventilation system of this mountain fortress was this air inlet with a diameter of more than two meters, but this would no longer take care of it, at least, the nearby enemies would disappear, and once there was a change, he would be able to leave safely.

Who knows how long the shift change will take?

During the spray, he suddenly saw a hole in the top of his head, and an object of the same color as the rock poked out a few centimeters beyond the rock, like a raised stone, but up close, it was some kind of artificial equipment.

The moment he saw that thing, Xue Lang's heart tightened, knowing that he might have been exposed to the surveillance of the other party's detection, with such a high-tech body armor, how could there be no cutting-edge security measures?

Thinking of this, hearing that there were still voices in the cave, Xue Lang simply took out a bottle of ylang-ylang again, held it, and the thick mist was quickly pumped away.

After spraying for a few seconds, Xue Lang felt that the second bottle in his hand was about to be empty, put away the first alloy bottle that was already empty, pulled out the ronin knife, and cut the other party's artery, even if the other party had suffocated to death, Xue Lang would not be careless.

With a ronin knife in one hand and a spray bottle in the other, he cautiously approached the corner and slowly pressed the spray head.

Fortunately, although the sound is still covered here, the pumping force of the exhaust fan cannot reach here, and the aroma quickly spreads into the cave.

Immediately after, a snorting sound sounded, followed by someone saying, "It's really ......"

Before he finished speaking, there was no movement.

Xue Lang's legs were hard at this moment, he suddenly bounced up, rushed into the corner like lightning, didn't even look at it, the spray in his hand didn't stop, and quickly ran towards a portal, not caring about the figure sitting on the bed behind him, regardless of the guy sitting at the table in the cave, ghostly running quickly in Nuoda's space, and he arrived at the door between breaths.

Suddenly, I saw someone running wildly, the speed was extremely fast, and everyone who saw it was surprised, but at this startled effort, a strong aroma was inhaled into the lungs, and then, or pulling out a gun, or standing up slowly stopped, one by one softly lying back to the original position, or knocking down the chair, and falling asleep.

Call......

Xue Lang let out a sigh.

Quickly put away the alloy bottle, pulled out Colt, and quickly looked around the environment here, and found that it was indeed as guessed, there was no vent here, because there was a portal directly connected to the outside, there was no vent at all, only a narrow passage similar to a central air conditioner was across the other portal.

The whole room should have been watered with cement, very flat, definitely not directly excavated from the rock. And it's two portals, I don't know where they both lead.

In the room, rows of MK16s were neatly placed in the weapons cabinet, and behind several other glass doors, grenades, smoke grenades, gun grenades, etc. were full, looking at the posture, it exceeded the ration of the number of people in the room.

No matter what these people do, kill them!

Xue Lang's heart was crossed, he withdrew his gaze from those guns, looked at the computer screen in the corner of the room, and suddenly saw the corpse on the platform outside on the split screen of a screen, and couldn't help but be shocked.

Oh yes! No one is watching!!

Feeling that the cold sweat on his back was coming down, Xue Lang stuck to the portal behind him, listening intently in the thick aroma.

I don't know if the sound insulation of the portal is good, or if there is no one around, or if they have all fallen, Xue Lang didn't hear a trace of movement.

Confirm that there is no movement, a few flashes to another portal, confirm that this is the same as the door just now, it is a blast-proof door, I don't know how thick, I studied it a little, turned around and came to a person, and quickly rummaged.

Sure enough, the door card was found in the pocket of the other party's jacket.

Why didn't you have bullet armor......

Xue Lang looked at the exposed chest hair, paused slightly, and came to the door like lightning, and with a brush, the door shrank silently.

As soon as the door opened, Xue Lang was stunned.

A straight passage is dozens of meters long, and under the lights, there is no portal around, so turn ahead.

After listening for a while, I confirmed that there was no movement in the distance, thought about it, turned over and came back and closed the portal, and quickly came to the computer, looking for any structural drawings here.

Fortunately, in a few seconds, I found the structural diagram here, although it is only a schematic diagram of ventilation, but it is enough.

Seeing the schematic diagram, Xue Lang's eyes were empty, he quickly closed the exhaust channel, jumped up, and came to the location of the outside vent with a few flashes, took out an alloy bottle again, and pressed the button on the first gear, so that the aroma was slowly sprayed out, and it was pumped away by the strong airflow.

Without hesitation, he put down the spray bottle, turned around and went straight to the portal he had just opened, quickly disassembled the maintenance port, cut off the power to turn on, turned around and opened another door, and rushed in.

The schematic diagram shows that this location is for the maintenance and guarding of the air intake, and is not part of the defense system.

Defense, in the lower layer, according to the diagram, all the way to the end, there are three layers of protection, but the location of the core is in the bottom of the mountain.

As you can see from the ventilation diagram, the bottom has the most vents, which is obviously the most densely populated place.

Xue Lang ran wildly, his steps as light as a cheetah, almost silent in the closed passage.

Xue Lang no longer took care of the monitoring equipment in the passage, put away the ronin knife and pistol, held the MK17, and quickly rushed forward.

As he ran, he couldn't smell the scent in the tunnel, but he could see that there were two vents and two exhaust holes in the tunnel.

His sense of smell has been a little numb by the strong fragrance, but when he sees the vent, his heart is a lot more steady.

In the rush, he turned a corner, and went straight to the steps below, Xue Lang didn't even pause, and quickly ran down,

He didn't know how big the base really was, and if those ylang-ylang incense would be enough to cover the locations. There are only three of them, which is already a considerable amount, and there is no problem with covering a diameter of 100 meters, but the two bottles just now are sprayed, one is that the ventilation duct is too long, and it is unknown how much there is at the bottom, and the other is that I didn't know that there was an exhaust port before, and I didn't have time to see if the exhaust was automatic or timed.

He didn't even know that there was air monitoring in the air intake, and there was a secret second ventilation system here.

As soon as a hazardous substance is detected in the air, it is automatically shut down and the backup system is activated.

Fortunately, ylang-ylang is not an ordinary perfume, not even alcohol, a pure natural substance, not even flammable, and naturally not a harmful gas, who has nothing to set perfume as a harmful substance?