"What is the reason?"

I asked hurriedly.

Compared with my eagerness, Situ Qing and Mr. Mover are much calmer, and the two don't seem to care too much about the current situation.

"Brother-in-law, here's a circle!"

Liu Ling Tong put the lantern on the ground, used his hand as a pen, and drew a circle on the ground.

"You mean, we're going around in circles?" I asked.

"Yes!"

Liu Ling Tong nodded and said; "Brother-in-law, this section of the road is very cleverly designed, we seem to be walking in a straight line, but it's not!"

Liu Ling Tongzi said while drawing a picture on the ground, and said: "Brother-in-law, you have also seen that this section of the road is the most spacious section of the road we have walked, the road is wide, but the light has not changed, plus we are not walking side by side, it is easy to lose the sense of direction!" ”

"Don't talk nonsense, how did you find out?" I interrupted him.

"Hey, hey!"

Liu Ling Tongzi smiled and said, "It's not me, it's the little monkey who found out that something was wrong!" ”

"After the little monkey found out that something was wrong, I followed the clues pointed out by the little monkey and deduced it, and I also found that it was wrong!" Liu Ling Tongzi added.

"Is it natural, or is it artificial?" I asked.

"Artificial!"

Liu Ling Tongzi did not hesitate and replied directly.

"How are you so sure it's artificial?" I asked.

There is no trace of artificial excavation here, so it cannot be called man-made.

What I want to know more now is how we're going to get out.

If we've been going around in circles, there's no way ahead.

"You'll find out with me!"

The Liu Ling boy smiled mysteriously and led the way in front.

After walking along the passage for about three minutes, the Liu Ling boy stopped with a lantern and asked; "How's that, do you see what's different here?"

"I didn't see it!"

I looked around, and I didn't see anything out of the ordinary, whether it was the uneven place under my feet or the craggy cave walls on both sides.

"Don't sell it!" Mr. Mover said with a frown.

"I can't afford to make a joke!"

Liu Ling Tongzi muttered, patted the monkey's head, and said, "Little monkey, reveal the secret to them!" ”

"Chirp!"

Receiving the order, the monkey screamed excitedly twice, and with two hind legs on the ground, he jumped to the opposite side of us, and scratched down with one paw at the cave wall.

Zila!

A shrill grinding sound suddenly sounded.

"Hmm!"

I frowned at the irritation, it didn't sound right, it wasn't the sound of claws colliding with the cave wall, but it was like the screeching sound of an iron tool scraping against glass.

"Glass?"

Mr. Mover looked stunned and walked over quickly.

Walking up to him, Mr. Helmsman tentatively knocked on the spot where the monkey had scratched before, making a crunching sound.

I tried to knock on it too, and it made the same crunching sound.

"It's not glass, it's copper!"

Situ Qing spoke quickly, but his voice was a little solemn.

"It's copper!"

Mr. Mover nodded, and Liu Ling Tong lifted the lantern and took a closer look.

This is indeed a copper mirror, but I don't know what treatment has been done, the light shines on it, there is no reflected light, this copper mirror, it seems to have a light-absorbing effect.

"How did you find out?"

I asked curiously.

This bronze mirror is not leaky, and it is difficult to find it by visual inspection alone, even if you stand in front of this copper mirror, you can't find it.

"The little monkey found it!"

Liu Ling patted the monkey's head again and said, "The first time I passed by, the little monkey noticed that something was wrong!" ”

After speaking, Liu Ling Tong made a sniffing gesture.

"Does this bronze mirror have any special taste?" I leaned over and sniffed it, but I didn't smell anything.

"Chirp!"

The monkey waved its paws and barked twice.

"What did it say?" I asked, leaning my head.

"Cinnabar, Xiaoyan said that there is a smell of cinnabar on the bronze mirror!"

Ba Hongyu said.

"Cinnabar doesn't have a taste!" I'll reply right away.

But as soon as the words came out, I knew that I was wrong.

For ordinary people, cinnabar does have no taste, but monkeys are not human, and what it smells may not be a taste.

"What Xiaoyan sniffs is not the smell of cinnabar, but the smell of yang fire contained in cinnabar!" Ba Hongyu explained.

Sure enough, Ba Hongyu's explanation was similar to what I guessed.

"Situ, what should I do now, pry open this bronze mirror?" Liu Ling asked.

"Pry open!"

Situ Qing said thoughtfully.

"That's it!"

Liu Ling Tongzi rubbed his hands and said to Ba Hongyu: "Old Ba, take a hand!" ”

"Hmm!"

Ba Hongyu nodded, and Liu Ling Tongzi left and right, each holding one end of the bronze mirror, and exerting force at the same time.

Squeak!

At the same time, the copper mirror rubbed against the ground, making a harsh sound.

"It's on!"

I whispered.

The moment this bronze mirror was pulled out, I felt that it was not just a bronze mirror, perhaps it should be called a bronze door.

This bronze mirror, about one meter and a half wide, about two meters high, and nearly two centimeters thick, has to weigh hundreds of pounds alone.

And after the bronze mirror was removed, the passage behind it attracted the attention of all of us.