Both the Sage Soldier and Qiu Tian donned gas masks, and the Sage Soldier took out their specially equipped miniature charger from his backpack and carried it on his left shoulder, holding a small pistol in his right hand. The Sage Soldiers and Qiu Tian have always been very stealthy, silent, moving in the dark, even if there are people hiding underground, they will not notice that they are approaching unconsciously on the ground.

The Sage Soldier walked to the door and gave Qiu Angel a look, they had already found the location of the secret door, this secret door was tiled, like a downward hatch, and I don't know what kind of building it was underground.

The Sage Soldier had already used portable instruments to detect that the area of the underground building was not large, more like a secret room, but the depth of the underground building could not be measured.

There was a lock on the secret door hidden in the grass, which was locked. This lock is very ordinary, nothing special, it is not a high-tech device, it has been quietly cracked by the Sage soldiers. Judging by the clues found so far, the hidden things here are not very advanced and complex. There are all kinds of indications that the buildings and facilities here are all purely built by individuals, including signal jammers, which are also patchwork and installed by individuals using self-made methods, without professional technology and parts and equipment, not smart, no advanced security systems, and no signs of outside organizations participating in this **.

Even so, although the surroundings have been confirmed to be safe, the underground buildings are still full of mystery and uncertainty, and what exactly Li Fugui is doing down there is still a mystery, and it is unpredictable whether the underground is safe or not.

For the infiltration of unknown buildings, Qiu Tianzai

Judging from the current situation, although this underground building is hidden, it still lacks sufficient defense means for professionals such as special forces or agents, and this is likely to be Li Fugui's private secret room, and there should be no one else, of course, it cannot be ruled out that there are Li Fugui's accomplices or the possibility of an ambush.

As for the way to enter this underground structure, it was up to the Sage Soldier to decide, and the Sage Soldier chose a very straightforward plan.

The Sage Soldier and Qiu Tian were ready, he made a gesture, Qiu Tian walked behind the secret door, squatted down, fixed the hidden groove on the secret door with a rope tool, and then quietly retreated, gently pulling up the rope. The Sage Soldier had already taken out a special grenade from his backpack, stood on the side of the secret door, and nodded to Qiu Tian, Qiu Tian pulled the rope and opened the secret door at a small angle, and at the same time, the Sage Soldier had already thrown the grenade down, Qiu Tian immediately released the rope, and the secret door fell and closed.

The entire action process between Qiu Tian and the Sage Soldier did not exceed 2 seconds, and they cooperated tacitly. Although it was only 2 seconds, the Sage Soldier and Qiu Tian had already seen the structure of the secret door, which was covered with a layer of dirt and weeds, the middle layer was iron sheet and wooden planks, and the back layer was rubber. Under the secret door is a staircase with a faint light inside. The Sage Soldier didn't move, he held his gun and aimed at the secret door, and Qiu Tian also held a miniature submachine gun to prevent someone from rushing out of the ground. The Sage Soldier looked at the time and made a gesture, Qiu Tian opened the door again, and saw a faint light shooting from inside, and some smoke drifted out. Qiu Tian judged by the smoke coming out that the underground building was not too large, which was produced by a special grenade (narcotic smoke bomb).

Anesthetizes smoke, which can quickly stun people and lose the ability to resist. Underground buildings are supposed to be airtight, with no passages in all directions, and as soon as fresh air enters the ground, it blows out lingering anesthetic fumes.

Qiu Tian looked at the secret door, there was no movement below, no matter what, after the surprise attack of the anesthetic smoke bomb, even if there were people below, they must have been anesthetized and powerless to resist. At this time, the Sage Soldier had already quickly poked under the tube peep glass, and the PDA of Qiu Tian and the Sage Soldier immediately showed the internal environment of the underground building captured by the peep glass.

Qiu Tian looked at the picture on the PDA, and clearly saw the underground building, his face changed, and after going down the stairs, it was a small secret room, but it looked like a laboratory, and there were two people in the innermost.

But the two men were sitting on the bench, sturdy, with stuffed mouths. It seemed that the two men were already unconscious.

The Sage Soldier remained calm, expressionless, and there was no one else in the chamber, looking safe. The Sage Soldier gestured to Qiu Tian and asked Qiu Tian to be on guard. The Sage Soldier skillfully took out the chemical protection sealing plastic film from his backpack to seal the secret door, and then took out the instrument to test the air composition and other environments in the secret room.

Qiu Tian looked at the PDA picture, the underground secret room looked very dilapidated, there were a few dim electric lights, very shabby, there were a few broken wooden tables on the wall, there were some test tube glass bottles and metal boxes and other things, Qiu Tian thought, what is this laboratory used for?