It's now!!! Lin Rui jumped out and fired, first with a short burst of three shots. In this passage, the sound of gunfire after the weapon is silenced is still not small. Three bullets tore through the mercenary's mask, then pierced through the unprotected mask and into his neck.

The mercenary let out a short, high-pitched roar with both hands on his neck - and then collapsed in a pool of blood, dead.

The queue of mercenaries patrolled clumsily stopped, and everyone looked around alertly. Lin Rui quickly hidden, and when he heard two more soft sounds, someone in the team of mercenaries fell down.

"Viper reports, the guard has cleared. Yelena's voice.

"Alright, free attack!" Lin Rui roared. Before shouting out, he was already shooting. In less than a second, four more mercenary patrolmen fell, all of whom were shot in the head.

The remaining three mercenaries grabbed their rifles and frantically scanned back and forth, trying to find the enemy in ambush. They were also exchanging things loudly. John leaned out from the side of the passage, locked onto the nearest mercenary, and pulled the trigger. The mercenary fell to the ground, blood spilling from his helmet.

Two more flashes of fire flashed, and the remaining two mercenaries were killed.

Yelena came up, found the weapons of these mercenaries, took some weapons and bullets, and distributed them to Lin Rui. Lin Rui's AK-12 uses a relatively rare 5.45mm bullet. Once the bullets ran out, it was necessary to use these captured weapons.

This female sniper's mind is indeed much more delicate than that of ordinary people. Lin Rui nodded and took the weapon and ammunition. After a few more kilometers, they left the passage. In front of it are several large lifts for heavy vehicles, which extend deep into the ground.

"We can't go here. Lin Rui shook his head and said, "Follow me, there is a passage on the side to reach the maintenance elevator." ”

But traversing this maintenance passage is harder than navigating through the aisle. Because it is too narrow, some places can only crawl forward. Then take the maintenance elevator down. Because of the depth of the base, the process of descending the elevator is simply long.

As they walked out of the service hallway, they came to a maintenance shaft on the edge. Lin Rui checked his map and led Yelena towards the exit of the water system. The mouth of the two-meter-diameter pipe is covered with a metal grating. But Lin Rui and Yelena still pried the fence open and walked in.

They trudged through waist-deep sewage. Lin Rui didn't like this kind of narrow space very much. Their mobility was limited by long and narrow pipes, and to make matters worse, they had to be grouped together, which could easily be wiped out by grenades or heavy firepower. But this is their only chance.

They follow an electronic map as they navigate their labyrinth of pipes. The light shone through the ventilation holes in the maintenance shaft, leaving only a dim halo. Often, something moved over it, obscuring the only light. It was supposed to be the footsteps of a mercenary patrolman, who was walking overhead.

Lin Rui and Yelena quickly and quietly moved forward through the mud and sewage. They eventually arrived at their destination, where they had direct access to the maintenance elevator in the center of the base.

Lin Rui shook his head slightly, Yelena nodded, and quickly dispersed, vigilantly monitoring the surroundings. Lin Rui stretched a fiber optic probe out of the trash grid, and then connected it to the helmet. Look outside with the help of the eyepiece on your helmet. He learned this hand from Lincoln.

At that time, he also ridiculed Lincoln and other Yankees for being dependent on electronic technology. But in any case, it sometimes works very well.

The green glow of the night vision goggles gave everything Lin Rui saw a strange atmosphere. At the corner of the aisle there is a mercenary sentry, and a team of itinerant sentries roaming around......

In some cases, furniture had been overturned, garbage containers had been overturned, and many windows had been shattered. Lin Rui didn't see any hostages—dead or alive, none.

"How's it going?" Yelena asked in a low voice.

Lin Rui shook his head, turned around and said in a low voice, "Damn it, the hostages are not in this area." It was clear that this was originally a work area, and most of the hostages were scientists here, and they were all captured here. But for some reason, these hostages have already been transferred. ”

They could only move on, and after passing through an area, Lin Rui checked the situation on the ground again.

The enemy is denser here, and two heavily armed mercenaries are patrolling. The other two mercenaries were squatting in a corner, smoking cigarettes. Then, Lin Rui turned the fiber optic probe in the opposite direction and looked at the situation on the other side of the aisle from a distance: there were more mercenaries moving there.

He retrieved the probe and led Yelena some distance south, then motioned for the others to stay where they were, and climbed a short escalator himself to a manhole cover. Lin Rui carefully stretched the probe out of the vent again.

A mercenary's boot stood right next to the probe, obscuring half of his vision. Lin Rui was depressed for a while, and he slowly turned the probe at a speed that made him feel tormented. Then, he saw multiple mercenaries walking back and forth here. They all patrolled back and forth around a room opposite. Even two stationary machine guns were placed near the exit.

"This should be it. But this defense is ridiculously strong. Twenty or thirty people, and machine-gun fire was specially arranged, blocking almost the entire area. Lin Rui scolded for a while, and then he also found more things that were not conducive to completing the task.

He retrieved his probe and began to consult the map. As indicated on the map, this room is a conference room for a research department. The mercenaries have deployed heavy troops here. The two fixed machine guns kept the entire area in front of the gate within its range of fire, and any frontal assault on it would be self-defeating.

But why did they focus on guarding this place? There was only one answer, this should be the place where the hostages were held.

Lin Rui quietly sneaked back to meet Yelena. He pointed first to the passage to the bottom of the building, then held up two fingers, pointed to her eyes, then to the passage, and finally slowly clenched his hands into fists.

Yelena nodded, very slowly, and walked into the waterway, scouting it.

Lin Rui raised his wrist and looked at the time, they had gone smoothly along the way, so they didn't exceed their expectations too long. But after determining whether these hostages were inside or not, there is a bigger problem. How can they rescue this large group of people, according to the data, this is a group of helpless scientists, and most of them are old.