In the corner sentry tower, about twenty meters to his left, although there were no lights, there was a mobile phone screen flashing inside.

Obviously, when someone is on duty inside, they are bored playing with their mobile phones.

If Li Yan had just jumped directly to the top of the wall, it was very likely that he would be directly detected by the other party.

A few seconds later, Li Yan confirmed that only the nearest sentry post was on duty, and the other three were empty.

In the night, Li Yan's figure quietly crouched on the top of the spacious wall, ghostly approaching the window of the sentry tower.

Sticking to the side of the window, Li Yan could see clearly the number of guards on duty in the sentry tower.

Two people, one resting and the other holding a mobile phone, are enjoying a small movie from a distant island country.

"Brother Yan, you can directly enter the laboratory from the sentry tower."

Tie Qinglan's voice soon sounded from Li Yan's ears, suggesting a possible invasion route.

Li Yan didn't make a sound, just quietly opened the window, and then turned over and entered.

A few minutes later, Li Yan had already changed into the uniforms of the guards, and even carried the Uzi submachine guns they were holding on their backs.

"Plan the route."

After Li Yan was ready, he gave Tie Qinglan a command, and then he went down the ladder of the sentry tower and entered the internal area of the laboratory!

At this time, Tie Qinglan had also successfully controlled the security system of the laboratory, and through the security system, all the situations in the laboratory were cleared.

It's just that what makes her a little suspicious is that she didn't find Yu Luoran's shadow in this laboratory.

At the very least, she had access to more than forty-eight hours of real-time data recorded in all security systems.

"Brother Yan, the above-ground part has not found a target, if she is really here, I'm afraid she is in the underground fortress."

Tie Qinglan's voice was not high, but her tone was full of seriousness and seriousness.

"Underground fortress?"

The moment Li Yan heard these four words, he almost immediately thought of a place in his mind.

"Qingluan, you mean the confinement room in the original prison?"

The prison has more than 20 confinement cells.

Moreover, all of them are underground, dark, damp, and have no sunlight all day long, and the only communication with the outside world is a basketball-sized ventilation hole.

The vents are designed to ensure that prisoners are no longer confined to confinement and die due to lack of oxygen.

However, the vents are not designed to be an entry point for fresh air, but are located near the toilet.

Whenever the ventilation fan is activated, the foul smell of the toilet will go down the exhaust hole directly into the underground confinement room.

Despite the bad smell, the good thing is that there is enough oxygen to ensure that the person does not die.

If the laboratory needs an underground fortress, the original confinement room is definitely the best choice.

As long as all the confinement chambers are opened, and then the ventilation, drainage and other systems are rebuilt, it is definitely a place that can be called a fortress!

"Brother Yan, you're right, the entrance to the underground fortress is in the direction of three o'clock in front of you on the right."

Tie Qinglan looked at the architectural structure diagram displayed on her computer screen, and reminded Li Yan at the same time.

"You need to go through two security gates and turn right about fifteen meters to see it."

"Brother Yan, the security door is electronically identified, I can handle it, but at the entrance of the underground fortress, there are two guards, so you can only do it."

"Qingluan, let's start."

Li Yan didn't hesitate for anything, and after giving an order, he immediately swaggered towards the first security door.

It was early in the morning, so there wasn't anyone in the lab.

Li Yan was wearing a laboratory guard uniform, and the picture in the monitor had already been controlled by Tie Qinglan.

So in this empty corridor, as long as he can calm down, he can swagger wherever he wants.

It took Li Yan about twenty seconds to walk to the first security door.

In the past 20 seconds, the warning light of the electronic identification system on the safety door has been showing a red state.

Until the moment when Li Yan's figure stood in front of the security door, Tie Qinglan's voice sounded faintly.

"Open the door!"

The red light turns green and the security door opens automatically!

The second door, Li Yan, took about thirty seconds.

When he came to the corner, Tie Qinglan's voice had already sounded again.

"Brother Yan, inside the fortress...... Be careful! ”

Tie Qinglan knew very well that those two guards couldn't stop Li Yan from entering the underground fortress at all.

What she worries about is that there is no information about the underground fortress in the security system.

In other words, this high-security area, located beneath the lab, is a completely independent offline security system.

If you want to find out what's inside, you have to go in yourself!

Li Yan didn't respond to Qingluan again, but walked out with a smile on his face.

Walking out of the corner of the corridor, about fifteen meters or so within his line of sight, a round iron door that exuded a cold metallic luster appeared in Li Yan's gaze.

Just by looking at the metallic luster emitted on the surface, this iron gate knows that it is very heavy.

On either side of the iron gate, two straight-built guards stood.

The two guards looked up at Li Yan the moment his figure appeared.

It's just that the moment they saw Li Yan wearing the uniform of a laboratory guard, they immediately relaxed their vigilance again.

"You're early."

One of the guards looked in Li Yan's direction, raised his hand to look at the time, and at the same time added, "There are still five minutes left in the shift change." ”

At the moment when the guard's voice landed, another guard suddenly realized that Li Yan was not the one they were waiting for.

"You're not Rovsky......"

The guard was about to raise his gun to shoot while speaking, but Li Yan's movements were as fast as lightning!!

Two sharp knives slashed directly at the guard's throat, and then grabbed the necks of the two guards with both hands, making a super intimate collision!!

The two heads slammed into each other, and after they fell to the ground, the two guards fell into a coma!

The guards still have five minutes to change shifts, which means that Li Yan has four minutes at most to enter and exit the core area of the laboratory.

According to the principle of equal distribution, it takes two minutes for each to enter and exit.

Even in a state of thinking, Li Yan did not slow down the movements in his hands.

On one of the guards who had fallen to the ground, he got the pass card for the iron gate.

Opening the iron door, Li Yan didn't hesitate at all, and walked in!

As Li Yan's figure entered the core area of the laboratory, Tie Qinglan, who was five hundred meters away from the laboratory, suddenly frowned.

Because the communicator she gave Li Yan was not just a communicator.

The communicator contained her newly installed positioning system.

Through the transmitted GPS signal, Tie Qinglan can see Li Yan's movement trajectory on the computer.

However, just as Li Yan walked into the underground core area of the laboratory, the signal on her computer suddenly disappeared!!