The ventilation ducts in the hospital are narrow, and people can only move in a crawling position inside.

Wu Mian was very stiff when crawling because of the ceramic spine, and Nanci in front of him was even more uncomfortable.

When he was marching before, Nan Ci could still carry the unconscious Ning Guangyuan on his back, but after entering the ventilation duct, he could only choose to tie a rope under Ning Guangyuan's armpit and drag him forward.

It was pitch black in the ventilation ducts, and Nan Ci could crawl forward through the night vision function of the electronic eye, while Wu Mian could only follow behind, discerning the direction through sound and groping, and at the same time set up easy-to-spot mines to intimidate the pursuers behind from coming forward.

After more than ten seconds, Nanci had already climbed to a fork, and looked to both sides, and there were empty pipes on the left and right.

The pipes of the hospital extend in all directions, once you choose the wrong direction, you can only go around in circles on the same floor, at this time they have been exposed, if you choose the wrong road, you must be more than lucky.

Wu Mian saw Nanci stop and asked, "Why don't you leave?" ”

Nan Ci said in a low voice: "There is a road on the left and right, I don't know where to go, let's take Ning Guangyuan with us, once we take the wrong road, it will be difficult to go back." ”

Wu Mian took out a kerosene lighter in his pocket and threw it towards Nanci: "The location we are in is the basement, and the vent is to take the air outside, and walk up to the vent." ”

Nanci picked up the lighter that had fallen beside him, lit it and confirmed the direction through the faint shaking of the flame, and then crawled to the left.

The two of them were fortunate that the pipes here were not straight up and down, in order to facilitate ventilation and avoid dust accumulation, they were all tilted, and although Nanci could not determine his position, he could also feel that he was always moving upstairs.

After about forty seconds, the angle of the pipe changed from inclined to horizontal, Nan Ci saw a little light coming from the end of this pipe, and was about to continue walking, but Wu Mian's voice suddenly came from behind: "They must have placed people in all the vents, we can't leave from that place!" ”

Nan Ci stretched out his hand and pressed the wall of the ventilation duct: "The air duct here is made of composite metal, and the movement is greater if it is blasted, and the explosion in the confined space is also a danger to us!" ”

Wu Mian said quickly: "Look for curves, this kind of ventilation duct will be set up with airtight cleaning holes near special-shaped pipe fittings that are easy to accumulate dust. ”

Hearing this, Nan Ci sped up his movements: "There is a fork in the right front, follow me." ”

Wu Mian followed behind, and just as he helped Nan Ci push Ning Guangyuan into the pipeline, he heard a noise in front of him.

The cover of one of the vents was lifted, and a pistol with a gun lamp reached into the pipe, and the gunman saw Wu Mian illuminated by the light, and before he could react, he heard a gunshot.

"Bang!"

Wu Mian shot the opponent in the head, shook his head to suppress his ears that were buzzing by the echo, and slid into the fork in the pipe by kicking the wall.

"Bang bang bang!"

Another hand reached in and fired a few random shots into the pipe, followed by a shout: "People are in the pipes on this floor, lock off several rooms around them!" ”

Seeing that they had been exposed, Nan Ci knew that it would be even more disadvantageous to continue to hide in the pipe, so he kicked off the baffle in front of him, looked down sideways, made sure that there was no one in his sight, stuck the upper side of the baffle with his leg, and hung his upper body upside down, while pointing the muzzle of the gun at the previous visual blind spot.

Nan Ci confirmed that it was safe in the room, adjusted his body on his back, climbed the edge of the vent with his hand and jumped down, Wu Mian also had a tacit understanding to push Ning Guangyuan down, and then jumped out of the pipe.

They were located in the pharmacy room of the hospital, surrounded by shelves with all kinds of medicines.

The apothecary room has always been a place for idlers to enter, so they have no windows in this room, only an anti-theft door in front of it.

The security door is not soundproof, and the two of them are inside the house, and they can already hear the shouting outside and kicking open the other doors, and the sound is still moving towards them.

Wu Mian knew that the two of them alone would not be able to defend this room, so he stepped on the shelves and was about to leave: "Withdraw!" ”

"We can go up, but we can't take him up!"

Nan Ci glanced at Ning Guangyuan, who fell to the ground, and then at the three-meter-high ceiling, and said in a low voice: "I have already notified Zhu Tao that they have come in to answer, so I can only hold on!" ”

Wu Mian grinded his teeth helplessly, and then rummaged through the shelves beside him.

Nan Ci saw Wu Mian's actions and pointed a gun at the location of the door to guard: "What are you looking for?" ”

"If you want to win more with less, explosives are the best weapon...... Found it, nitrified sweet. Oil injections. Wu Mian picked up an infusion bottle: "Nitroglycerin, whose scientific name is glycerol trinitrate, belongs to nitrate explosives, which is about 1.4 times more powerful than TN.T, and can also be used as a reliever for angina." ”

"I know what it's made of." Nanci reminded: "The nitroglycerin solution is diluted. ”

"Its excipient is absolute ethanol, which will release carbon monoxide by itself, which will produce an explosion like a violent collision, and if it is ignited artificially, the probability of explosion will be higher!"

As Wu Mian spoke, he began to unscrew the nitrification gan one by one. The bottle of oil solution is stuffed with a medical cotton pad at the mouth of the bottle: "Lighter for me!" ”

……

In the corridor outside, a group of gang members searched from both sides, one by one, and soon gathered in front of the door of the pharmacy.

One of them rummaged through the keychain in his hand, took out the key with the label of the apothecary room and inserted it into the keyhole, slowly unlocking the door while turning his gaze to his companion.

His companion raised his pistol in both hands, aimed it at the door, and nodded.

"Bang dang!"

The door was slammed open, and the two gunmen stood opposite each other, pointing inside the room on the left and right sides, locking the room as much as possible.

Confirming that their sight was safe, the two turned their guns around and entered the door, pointing back to back to the sides behind the door.

Merfolk outside rushed in, ready to search.

"Whoa!"

Suddenly, a medical cart in a white lab coat rushed into the crowd through the gap in the shelves in front of it.

"Bang bang bang!"

One of the gunmen quickly turned around and pulled the trigger on the cart repeatedly, and the smell of alcohol suddenly spread through the air.

"Bang!"

Under the impact of the bullet, the medical cart deviated from the course and crashed into the shelf, and the medical alcohol bottle on the cart was thrown out by inertia, and the alcohol was spilled on the ground.

Before the person at the door could react to what was going on, another infusion bottle flew from behind.

"Boom!"

Ignited nitrified sweet. The oil solution smashed into the ground, and in an instant a fireball exploded.

The crowd that had just rushed in was instantly enveloped in flames, and the few people in the front who were splashed with alcohol began to retreat towards the door with a loud wail.

"Bang bang bang!"

Taking advantage of the chaos of the crowd, Wu Mian appeared behind a shelf in front of him and began to pull the trigger continuously.