"You know the Mawangdui tomb group, right?"

Lighting a cigarette again, Huo Fatzi began to talk to Chen Xian about the "key", and at the same time, they also returned to the dean's room again, looking for the next way in this empty room that was burned to ruins, the secret corridor that Hong Jinxi had mentioned.

"Mawangdui in Changsha?" Chen Xian thought for a moment and asked, "Is it the tomb group that unearthed the corpse of an incorruptible woman?" ”

Huo Fatzi nodded, walked around the room, and continued to talk to Chen Xian.

"In 1972, five keys were unearthed in Mawangdui, and from a certain point of view, they are beyond the modern concept of ancient cultural relics, and are more like a high-tech product."

Hearing this, Chen Xian's interest suddenly became a little stronger, and his eyes became more and more curious.

"What's going on?"

"You'll know just by listening."

After these five keys were unearthed, the superiors quickly paid attention to them, and laid out strict protection measures, requiring all departments to cooperate with all their efforts, and the five keys must be sent to the headquarters in the capital as soon as possible.

But no one expected that there would be accidents under such strict protection.

No one had access to the safe where the keys were kept, and dozens of armed men guarded it, and eight 24-hour surveillance video cameras were placed on the top, bottom, left and right to ensure the safety of the five keys.

It can be said that in those days, it was the ultimate to be protected like this.

But when the transport vehicle arrived at the headquarters research institute, the experts opened the box and took a look......

Only four of the five keys remained, and one of them was missing.

"No one knows where that key went or how it was lost." When Huo Fatzi said this, he seemed to remember the chaos of the year, and couldn't help but shake his head, "Our department is also in chaos, and the superiors ordered to start a thorough investigation, first to investigate our internal people, and then to check others, but in the end, no clues were found." ”

"It wasn't until the end of the nineties that the surveillance video of Hong Jinxi's theft of the Lin family's vault was exposed, and we found out that the key was on him."

"He stole the key in the first place?" Chen Xian asked curiously.

"Probably not, the time is not right." Huo Fatzi shook his head and said, "We also wonder why the key is in his hand, but now that Hong Jinxi is dead, this clue can be regarded as broken." ”

After that, Huo Fatzi took a puff of cigarette and continued to speak with a subtle expression.

"After expert identification, these keys have little to do with the Mawangdui Han Tomb, and they are not products of the Han Dynasty, which can be traced back to a long time, even more than the Xia Dynasty BC, and the font engraved on the key has never been seen, which is more complex and difficult to decipher than the oracle bone inscription."

Chen Xian listened with great interest, and motioned for Huo Fatzi to continue.

"Of course, even the oldest objects are cultural relics, and the reason why I say they are beyond the modern concept of cultural relics is because of their characteristics."

"What are the characteristics?" Chen Xian asked.

A strange look flashed in Huo Fatzi's eyes, his tone became a little complicated, and he replied in a low voice.

"Unlock the lock."

That's right, the most unbelievable ability of these ancient keys is to pick locks.

Electronic, mechanical, digital, cryptographic.

No matter what kind of lock it is, these ancient "keys" can be opened, and the way of unlocking is so strange that ordinary people can imagine.

"Those keys seem to be smarter, they can recognize all locks, as long as they are placed against the position where the lock is opened, a lot of powder will flow out of the top of it and forcibly invade the inside of the lock, and the color looks like lead powder."

Huo Fatzi had seen the other four keys, so when he said these words, he couldn't help but have a trace of surprise in his eyes.

"The powder that comes out of the key is coarse at first, and the powder behind it is very fine, and in the end it is directly invisible, at least not with the naked eye."

"So...... What powders did the keys use to unlock? Chen Xian asked thoughtfully.

"Yes." Huo Fatzi nodded.

"Any lock can be opened, this is a master key." Chen Xian smiled, probably a little understanding of his superiors' actions of being in such a hurry to find the key.

Not to mention how useful they can play after they get this key back, it can be seen from Hong Jinxi's incident that they can't stand the consequences of just letting the key go to the people.

Whoever has this key, and has a little anti-reconnaissance awareness, won't he become a thief?

"I've said everything that should be said and shouldn't be said, you have to be tight, don't talk nonsense, the matter about the key is classified in our department, and it will be troublesome to say it." Huo Fatzi admonished.

"I know." Chen Xian smiled and nodded.

After satisfying Chen Xian's curiosity, Huo Fatzi slowly became anxious,

Because after walking around the dean's room for more than a dozen times, he still didn't find the entrance to the secret corridor.

Huo Fatzi smoked a cigarette violently, his brain was running rapidly, and he recalled the pictures of the interrogation of Hong Jinxi.

Didn't he say there was a corridor here? Why can't I find it? Could it be that he lied to me?

"What the hell is going to be found!" Huo Fatzi was a little anxious, snuffed out the cigarette butt in his hand and threw it on the ground, and stepped on it hard, "It's really not good, I asked people to find the building plan, I don't believe it......"

"Are you sure there's a hallway here?" Chen Xian asked.

Huo Fatzi told him about that corridor before, but he couldn't find it after looking for a long time, and Chen Xian also felt a headache.

"That's what Hong Jinxi said anyway." Huo Fatzi frowned, his expression was distressed.

Chen Xian nodded, and silently began to walk next to the corner of the wall, knocking on the wall with his hand as he went.

According to the architectural structure of the psychiatric hospital, it should be a conventional frame structure, except for some non-load-bearing walls, the rest of the walls should be solid concrete walls.

The dean's room is close to the interior of the corridor, and the non-load-bearing walls on the left and right sides make the percussion sound relatively clear, while the sound feedback of the front and rear walls is much duller.

Under Chen Xian's patient tapping, gradually, he heard a different voice.

"Bang."

This sound is extremely crisp.

There is a slight echo, and you can hear that it is hollow inside.

"Is it in the wall?"

Chen Xian looked at the wall with some doubts, and Huo Fatzi also hurriedly came over and knocked on the wall a few times with his hand.

"Here...... That's right! ”

Huo Fatzi also breathed a sigh of relief, a rare smile appeared on his heavy face, and he pushed the gold-rimmed glasses on the bridge of his nose.

"Hong Jinxi said that the corridor is at the back of the dean's office, and this position is facing the door of the dean's office...... Well? ”

Huo Fatzi was stunned for a moment, looked at Chen Xian, who was doing leg presses, and asked confusedly, "What are you doing?" ”

"Open the door, we can't go through the wall, can we?"

Chen Xian smiled, continued to press his leg a few times, and then slowly stood up.

Chen Xian is still very confident in his own strength, in his opinion, it is not a matter to kick this hollow wall skin at all, rather than painstakingly chiseling the wall with tools, it is better to kick it simply.

Before Huo Fatzi had time to stop him, Chen Xian had already jumped up, kicked on the wall with all his might, and made a loud bang.

In an instant, the wall recessed.

Judging from the big hole that Chen Xian kicked out, it was indeed hollow.

"Sure enough, it's inside! We weren't wrong! Huo Fatzi saw the metal door frame inside through the gap in the pit, and immediately breathed a sigh of relief.

It seems that Hong Jinxi is not lying, this is indeed the entrance to that corridor, as long as you pass through this metal door, and then through the corridor behind the door, you can finally reach the most secret patio space.

"The hallway you're talking about is behind this door?" Chen Xian asked.

"Yes, you'll see it when you open the door."

Huo Fatzi said, leaned over to the hole in the wall again, and looked into it carefully.

The outer wall skin was only as thin as a brick, so it was no wonder that Chen Xian could kick through it, and the door inside was still nearly twenty centimeters away from the wall skin......

Why did they hide this door in the wall?

Is it possible that every time you go in, you have to chisel the wall open?

Don't they find it troublesome?

Huo Fatzi thought of this, and his heart was even more puzzled, but at this moment, he heard a strange sound.

The sound was noisy, voiced, coming from that door.

It sounded like some kind of gasping sound, and judging by the sound......

There was more than one person gasping for air.