Chapter 657
Almost effortlessly, Ling Yu directly opened the mechanically locked steel door.

And with the opening of the door, the lights in the secret room suddenly lit up, which happened to cover the entire underground secret room.

It wasn't until this time that Ling Yu could clearly see the whole picture of the underground secret room.

I saw that the area of ​​this underground secret room was about the size of a basketball court, and there were a lot of historical relics exhibited in almost large and small sizes. There were all kinds of weird things, which fascinated Ling Yu for a while.

If you have to describe it, at this moment, it is like a historical corridor that contains the witness of the times, because you can always find all the historical relics from the history of human beings here!

Of course, Ling Yu is not a history buff, so his eyes are more focused on finding the legendary crystal skull.

The hard work paid off, and after Ling Yu's careful search, he finally found an exquisite crystal skull in the middle of this secret room.

Compared with the imitation exhibits placed above, the real ones here are more refined and realistic at this moment, and the crystal material can clearly see the difference.

The genuine crystal skull is more translucent and flawless, and even the outline of the inside of the skull is very fine, which is completely like a real human skull.

"Lily! This should be the real crystal skull, right?"

Although he had already confirmed in his heart that it was genuine, Ling Yu still asked cautiously.

"Well, this is one of the 13 crystal skulls! Get it and we can move on to the next one!"

Lily responded happily.

After getting the correct answer, Ling Yu didn't hesitate any longer, and directly exchanged a bottle of hydrofluoric acid from the system mall.

This is the best way to crack tempered glass, save time and trouble!

When Ling Yu evenly applied the ratio of hydrofluoric acid to water on the tempered glass cover, it took less than 2 seconds, but the original smooth tempered glass cover instantly heard a slight crisp sound!
Immediately afterwards, the entire tempered glass cover began to show fine cracks, and the cracking speed far exceeded Ling Yu's expectation.

When the shattered tempered glass was just big enough for Ling Yu to take out the crystal skull, Ling Yu pierced the tempered glass cover and directly took out the crystal skull inside.

However, Ling Yu had just taken out the crystal skull and hadn't warmed it up yet!Immediately there was a rush of sirens ringing inside!
"what happened?"

Ling Yu asked with a confused face.

"This is a trigger alarm that will only sound when the crystal skull is taken away, so it cannot be avoided!"

Lily explained.

Hearing this, Ling Yu couldn't help being stunned. Originally, he thought that there would be no alarm after breaking through the previous infrared sensors and the three gate locks. However, he still didn't expect that the last crystal skull would still be here. There will be a trigger alarm, really hard to guard against!
However, now that he has obtained the crystal skull, Ling Yu is not afraid of being discovered by triggering the alarm, so Ling Yu has no time to take a closer look at the next moment, and directly hides the crystal skull in the system space. direction to return quickly.

But what Ling Yu didn't expect was that the security personnel of the museum came even faster. Almost immediately after the alarm was triggered, there were already dense footsteps in the corridor outside, which blocked Ling Yu directly. In the underground chamber.

For a while, Ling Yu fell directly into an extremely passive environment.

But Ling Yu didn't panic in the slightest. Instead of rushing to the direction of the elevator, he hid in the underground secret room, waiting for the guards to come down and search.

Soon, with the sound of the elevator running, a group of heavily armed guards rushed out of the elevator and entered the underground secret room. They carefully and carefully searched every suspicious corner, but after turning around , but everyone got nothing.

"What's going on? Why is there no one here?"

A middle-aged man who was obviously the captain looked around suspiciously.

"Captain! We have blocked this place as soon as the alarm sounded. If someone breaks into this place, he must have no time to escape, but why is there no one here?"

Another person echoed.

"Did you search carefully when you came here? Are you sure no one escaped here?"

The middle-aged guard captain asked again with a serious face.

"We are absolutely sure! Not even a single mosquito can escape our eyes!"

The man confirmed with a firm face,
"Captain! The crystal skull placed here has disappeared!"

While the middle-aged guard captain was talking, the team members on the other side suddenly exclaimed.

Upon hearing the news, the middle-aged captain of the guard was taken aback, and hurried to the place where the crystal skull was originally placed.

When he saw the already empty display cabinet, his whole complexion instantly turned ashen.

"Damn it! This must be committed by a professional team, hurry up! Lock down the entire area, and the Crystal Skull must not be lost!"

The middle-aged guard captain immediately ordered.

However, while this group of people was busy analyzing the case, Ling Yu, who had already been invisible through the invisibility item card, quietly touched the elevator, and then Ling Yu slipped away without anyone noticing!
When the elevator slowly started to leave the underground secret room and came to the previous corridor, there were actually two guards guarding the door of the elevator with live ammunition!
The two of them glanced at the empty elevator, but they couldn't help being a little confused for a while. After all, the elevator is empty after all the elevators have come up.
However, seeing that there was no one in the elevator, the two guards didn't think much about it, and just stared at the direction of the elevator.

At this moment, Ling Yu didn't panic, walked past the two of them in a leisurely manner, and then left the underground secret room without looking back.

It's just that when Ling Yu returned to the tricked museum, he found that it had already been blocked!
Moreover, the place he sneaked into before was also discovered, and now there are many guards with live ammunition patrolling around vigilantly.

Fortunately, the gate of the museum was opened at this time. Although it was heavily guarded, it was of no use to Ling Yu.

I'm afraid no one would have thought that the person who stole the underground secret room tonight would be able to invisibility, so their mobilizing troops to block it was completely futile.

When Ling Yu quickly came out through the gate of the museum, the guards on both sides looked around suspiciously, as if they had noticed something.

"Lucas! Do you feel it?"

One of the guards asked the other to arrive.

"what?"

The other asked with a puzzled look on his face.

"It's just a strange wind! Just now I felt as if something passed by us quickly!"

The young guard explained solemnly.

However, he didn't know that Ling Yu was looking at them with great interest at this moment!
——Today’s public, public, account, uploaded a side story, and book lovers who like it can take a look.

(End of this chapter)

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