Seeing that Professor Xia volunteered, I stepped aside and waited for him to push the door.

The door is about 3 meters high, arched, wooden, and trimmed with vermilion lacquer and bronze floral ornamentation.

"Crunch~"

At the moment when Professor Xia pushed the door, I looked through the crack in the door, but there seemed to be a strong light inside, revealing a pale.

Maybe it's because of the proximity to the water, and the moon first, when Professor Xia gradually pushed the door open, he was surprised: "This! How can it be! ”

"What the hell is going on inside!" Seeing that he was shocked, I rushed forward and looked inside: "Uncle Xia, there is actually a passage here!" ”

At this time, Professor Xia's expression revealed a touch of paleness, perhaps such an unexpected result made him a little unexpected. However, for me, it was just as confusing, it was just a narrow road for two people to pass, and there was no extra space.

"Sen, this is weird. It looks like a large hall from the outside, but who knows that there is only one passage inside. Professor Xia looked at me and said.

I didn't answer him, perhaps because of such unrealistic things, I felt a chill that pierced my spine.

"Sen, what do you want?" Professor Xia patted me on the shoulder and asked, "Why don't we go in and have a look." ”

Professor Xia was just about to take a step, but I immediately reacted, grabbed him and said, "Uncle Xia, beware of fraud!" ”

When I hinted at him, he stopped and peeked in. "Sen, although the model of construction here is beyond our imagination, these two walls are flat and smooth, not like there are dark crossbows."

Professor Xia has determined that there is no mechanism in it, of course I don't have anything to say, but according to the layout here, it looks like there is a mechanism.

The two walls are 2.5 meters apart, and it is perfectly fine for two people to pass through at the same time, but if a guillotine is cut on the wall, it is just right, and one knife can kill two people.

In fact, if these two walls are equipped with guillotines, according to the height of the wall, and then take a suitable position, it is very difficult; So I think these walls are equipped with dark crossbows, or "circular dark crossbows".

On the question of what a "cyclic crossbow" is, the first thing that comes to my mind is the book I used to read.

The "Circular Dark Crossbow" is to take the corresponding two exit ports on the two walls, and after the left arrow is fired, it will return to the right exit port and touch its firing mechanism; Then, another arrow will be shot from the right; One left and one right arrow mouth out of the arrow to into the arrow for a cycle.

This trap repeats itself in a two-hour cycle, between the time it is touched and the time it is restarted in the next cycle.

To put it simply, after cracking the mechanism, it is safe for two hours.

"No, Uncle Xia, it's not as simple as we think." Seeing him staring at me for a long time, I finally told him about my considerations, "There is a dark crossbow in it, but the mechanism is cleverly set up, and it is completely integrated with the wall." ”

"Oh, no wonder I can't see a trace!" Hearing this, Professor Xia sighed, "Then, Sen, continue to talk about your opinion. ”

"Hmm!" I nodded at him, "Uncle Xia, these two walls look smooth, but have you noticed a problem?" ”

He poked in again and said to me, "No, everything is normal." ”

"No, no," I pulled him towards me, "and it was just a matter of light, and from this angle I could see a silver line on each wall, and a few dots that were pierced. ”

"Whew~" Seeing this, Professor Xia let out a long sigh, "It turns out that this is the key!" ”

"Hmm!" I nodded.

"The lines are deliberately aimed at so that the builder can easily identify them and avoid harming themselves." I continued.

"At what points is the solution?" Professor Xia speculated.

"Well," I confirmed, looking in again, "yes, those dots are the arrows." And, I suspect it's a special kind of swarm of dark crossbows. ”

"How special?" Professor Xia was puzzled.

"In particular, it repeats itself, and when the mechanism is triggered, the arrows are cleverly retrieved and waiting to be used again."

"No, it's unheard of to have such an environmentally friendly agency!" Professor Xia sighed.

"It's not environmentally friendly," I corrected, "it seems to be used as a disguise, not easily debunked." Moreover, the firing power of these dark crossbows is extremely huge, and if a person rushes into it, his body will be pierced by arrows.

"In that little space, those forces are completely efficient, and there is no buffer."

"Are you sure they're the kind of Darkbow swarms you say?" Professor Xia questioned.

"I'm not sure, because I've heard of it, but I can still judge it based on its layout." I replied.

"Why don't we try?" Professor Xia took out a white chess piece from his coat pocket.

"Hey," I said in surprise, "Uncle Xia, you've got all your props ready!" ”

"It's just a guy who eats." He said modestly.

When he suddenly took out a chess piece, I thought he wanted to use it to test the mechanism. Perhaps this is the experience of archaeologists, who are troubled by the many traps in the burial chamber.

"Uncle Xia, are you sure? Those points need to be triggered all at once, and if we miss one point, we won't want to go in, because it will leave unfired arrows. I reminded him.

"Sen, don't worry, I'm right." Professor Xia said confidently, "Look at me! ”

"Whoosh-"

The white round chess piece popped out of Professor Xia's fingertip and shot directly at the first point on the left wall where the silver lines were pulling, and then bounced to the first point on the right wall.

The piece crossed and reciprocated until it fell off the innermost wall. During this period, it took more than a dozen back and forth, an inelastic chess piece, and Professor Xia actually let it touch all the points accurately, which made me think it was incredible.

Therefore, I wonder if he is an archaeologist, because there are too few people who can do this.

"Sen, no response!" Professor Xia wondered.

Who knows, as soon as he finished speaking, arrows were shot on the wall. It was so fast that in a few seconds the passage was silent.

Then, the innermost wall we faced slowly rose, and there was another passage behind it.

"Uncle Xia, there may be a delay in this mechanism, but we have to go over right now, it will take an extra second, I'm afraid the situation will change."

"Hmm." He nodded.

As I walked into the passage, I could faintly feel a chill coming from both walls, which made it seem as if the walls were made of ice, or that there was an ice cellar near it.

"Mori, look!" Professor Xia was surprised.

Of course, he didn't say it, and I could see that behind this wall, there was another world.

The scene in front of me made me dumbfounded, so much so that Professor Xia had just cracked the mechanism, and he had learned those skills from here, so I didn't want to ask.

There is a huge space behind this wall, and it can be said that it is a real royal city.