Disciple, please come down the mountain soon. Your senior sister can’t wait any longer.

Qin Tianshuang, who disguised himself as a thin man, lowered his head and followed Pei Qingniao and Fang Zhiming in front, constantly scanning the sides of the road with the corner of his eyes.

After they entered the stairwell from the ground floor, went down one flight of stairs and passed through a door, the next step was not a regular staircase like the previous one, but a spiral staircase.

The group walked down the spiral staircase one circle after another. Qin Tianshuang secretly looked at both sides of the spiral staircase as he walked.

According to her original idea, since this underground training base is the core lifeline of the Pei family and an important backup base for cultivating fresh blood for the Pei family, it must be heavily guarded.

Not to mention heavily guarded, there will definitely be extremely strict security measures such as one guard every ten steps.

But along the way, there was not even a single person, let alone a guard.

The entire spiral staircase was like an empty Naihe Bridge leading directly to the underworld. There was no one in sight. It was so empty that Qin Tianshuang couldn't help but begin to doubt whether their information was accurate.

Is there really a Pei family training base underground?

With this question in mind, Qin Tianshuang followed the footsteps of Pei Qingniao and Fang Zhiming in front of him, while looking at both sides of the spiral staircase more carefully to see if there was anything unusual.

This glance really made Qin Tianshuang notice some problems.

Every time they went down a level on the spiral staircase, Qin Tianshuang noticed that a camera with a flashing red light appeared on the wall, proving that the cameras were still working.

But the problem is that the power and network systems of the entire building have been directly destroyed by an electronic pulse bomb from Tian San. How could there still be electricity and network signals underground?

This unscientific!

Either that or Tiansan’s bomb was not powerful enough to affect the underground base’s electricity and network.

Or there is backup power equipment in the underground base, so they can start the backup system as soon as the power and network systems of Tianbo Building are destroyed, and then restore normal power supply.

Whether judging from a rational perspective or a supervisory perspective, Qin Tianshuang would choose to believe the second possibility without hesitation.

It is better to hope that the rumor that the world is about to end will come true one day than to expect Tiansan to make a mistake of insufficient ammunition when performing a mission.

You know, among the top killers, Tian San is a well-known detail-obsessed person.

Once any mission is carried out, all the details of the target will be thoroughly understood, and only after everything is under control will the next step of action be initiated.

Something like this, where he ignored the power and network supply of the underground base, resulting in the electronic pulse being insufficiently powerful and thus failing to destroy the underground training base in one fell swoop, would never happen to Tian San.

Therefore, Qin Tianshuang had reason to believe that when Tian San detonated the electronic pulse bomb just now, he had actually destroyed the underground base's power and network supply.

The fact that Pei Qingniao failed to contact the people in the underground training base just now, and therefore had to go to the underground base in person to notify the people inside to retreat, is enough to prove this point.

The reason why there are still working cameras in this spiral staircase is that there must be a power supply system in the underground training base that is independent of the buildings on the ground. That is why the power supply can be restored so quickly after the power was cut off.

In sharp contrast to the underground base is the Tianbo Building on the ground. At least half an hour has passed since the incident, but the power supply has not yet been restored.

Moreover, establishing an independent power system is also a good thing for the underground base. Apart from anything else, this can completely ensure that even if a major incident occurs, such as the power system being cut off, once it switches to the backup power system, the various systems of the underground base will not be affected.

For example, Qin Tianshuang was obsessed with finding and paralyzing the ventilation system!

As the underground base is so deep into the ground, the ventilation system is of utmost importance.

If the ventilation system also goes on strike due to power outage, it won’t be long before the people in the underground base will be suffocated to death underground!

Once an independent power system is in place, it can be ensured that after an accident, the ventilation system, which is the most basic system, will still operate normally and will not be greatly affected.

But this also means that the importance of the ventilation system has greatly increased. For a system that is related to their own lifeline, the people in the underground base will probably set up extremely strict security measures to protect the safety of the ventilation system. This is also a big challenge for Qin Tianshuang's plan.

After the group walked down the spiral staircase for about two floors, the leader Pei Qingniao finally stopped.

The people behind him also stopped, and Qin Tianshuang looked over.

When she saw the scene in front of her, her pupils couldn't help but shrink slightly, and a hint of shock flashed across her eyes.

Ten meters in front of them was a silver-white door, which was now tightly closed.

Moreover, looking at the shape of the silver-white door and the extremely thick door frame, Qin Tianshuang guessed that the thickness of the door was at least more than 20 centimeters, and it could not be forced open by any brute force.

The only way to open this door is to use the correct secret key to open it!

And in the ten-meter open space between where they were standing and the gate, there was a flat metal floor.

Moreover, on both sides of the floor, there are semi-arc-shaped metal arms standing upright, which look like a jungle, quiet but with a hint of weirdness.

"This is……"

When Qin Tianshuang saw this scene for the first time, he immediately felt a sense of déjà vu.

After a little thought, she immediately realized what this thing was!

Gait detection device!

This device is specifically used to detect a person's posture and demeanor when walking, and it is also a way to verify identity!

Because everyone has different personal conditions, their walking gait and posture are different. There is absolutely no one in the world who walks in exactly the same posture.

Even if they are twins, there will definitely be obvious differences in their walking posture.

Moreover, compared with other identity detection methods such as iris and fingerprints, gait detection is at a higher level of difficulty in fraud.

After all, irises and fingerprints can be disguised to deceive identity detection, but how can a person's gait be disguised?

Even if it is a disguise, who can guarantee that the disguise is perfect and without any mistakes?