The roof of the cave is very high, the space is relatively spacious, and there are obvious traces of man-made excavation. The channel is not a straight line, but a downward spiral. There were several prohibitions encountered on the way, which were either broken by Du Feng with that ancient jade, or easily bypassed from one side.

The two of them walked for a meal, and finally came to a tall stone gate. It looks quaint, and if you look at it, you can see that it is an ancient style. What's even more peculiar is that there is a porcelain vase the size of a zhang in the center of the door, the bottle body is square and slender, and there are ears on both shoulders, painted with some ancient patterns.

Liu Yiwen had never seen such a style of stone gate, so he couldn't help but walk closer and take a closer look.

The left and right sides of the vase are symmetrically divided by two stone doors, and in the middle is a cylindrical glass tube the thickness of a baby's arm. At the bottom of the tube, there was also a fist-sized spherical object placed there, I don't know what material.

Liu Yiwen said in surprise: "What is the porcelain vase on this door?

Du Feng looked depressed and said: "I don't know what the ancestors designed this door for, when I first came here, I studied the mystery of this door for a long time and never broke it. Later, I didn't give up, and I tried here several times, but without success. ”

Liu Yiwen was surprised: "Then Brother Du has tried to forcibly destroy the door with brute force?"

Du Feng nodded stupidly and said, "After trying many times, Du did have this idea. However, with the wisdom of the ancestors, it seems that this has already been taken into account. ”

After that, he held up a cone-shaped magic weapon and said, "Brother Liu, please look!" He recited a few incantations lightly, and pointed towards the stone gate, and the magic weapon stabbed down towards the crack in the middle of the stone gate.

A surprising scene occurred.

Before the magic weapon hit, the originally static stone door buzzed, and the spiritual light lit up. In front of the stone gate, a wall of white light suddenly appeared. As soon as the cone-shaped magic vessel touched the wall of light, it began to stagger, as if drunk, and it only took a few breaths before it lost control and fell straight to the ground.

Liu Yiwen was surprised and hissed lightly. Thinking of the terrifying strength of this ancestor in the later stage of the infant, he really couldn't afford to forcibly break the ban, and it seemed that brute force would not work.

After a stick of incense, the wall of light disappeared, and the stone gate returned to its original state. Du Feng made a move with his hand, and the magic weapon was put into his sleeve. He flew to the "left ear" of the porcelain vase and introduced: "There is a slender pipe in the left and right ears that leads to the ball below. I thought about it carefully, and I guessed that the intention of the ancestors was to use wine to sacrifice to the shrine before this door could be opened. So, I poured the wine from here. When the wine entered, the ball rolled, and I was delighted. ”

Liu Yiwen's eyes lit up, and he thought: There must be a mystery here.

Du Feng sighed lightly and continued: "Who knew that I poured it from here, and after a while, the wine flowed out from the bottom of the bottle on the right. ”

Liu Yiwen was stunned and said, "There are holes below?"

Du Feng nodded and said helplessly: "Yes, and there is one on the left and one on the right!"

Liu Yiwen was suddenly, thoughtful, and frowned: "In this case, if you pour it in from the right, it will be the same result?"

Du Feng nodded silently.

Liu Yiwen came to the front again and looked at it carefully, and said in his heart: "In that case, did Brother Du pour wine from both sides at the same time?"

Du Feng responded: "Of course I tried, but unfortunately in this way, the wine did not leak out again, but there was no reaction to the door!"

At this time, Liu Yiwen was also stunned, and began to observe other positions on the door, Du Feng looked at him like this, and said with a wry smile: "Brother Liu doesn't have to work in vain, I have searched all the big and small corners on the stone door, and I have found nothing else." ”

Liu Yiwen still did not give up and continued to inspect until he finally gave up the idea of having other organs after he even checked the stone wall next to the stone gate.

He stood on the spot, sighed in his heart, and couldn't help but think to himself: If only Gongsun were here, she would have the most ghost ideas. Last time, she found another lair in the abyss, and finally found a clue to find Yuan Sulan back. However, the Yiren are far away in Dachu, and it can be said that the water is far away and cannot quench the thirst of the near.

As soon as he thought of this, he said to Du Feng: "Brother Du, this prohibition is indeed extraordinary, it is a combination of the mechanism and prohibition used by mortals, and there is nothing I can do about it." I still have important things to do, so I might as well leave it at that!"

Du Feng couldn't hide his disappointment, he didn't have much expectations for this new drinking friend. However, after talking last night, I felt like a confidant, so I decided to take him here to see the idea of one person planning for the short and the other for the long.

Du Feng replied crisply: "Okay, since Brother Liu has something to do, Du is not good to keep more, let's go out!"

Liu Yiwen no longer thought about this strange ban, but he was worried about Yuan Sulan again. Inadvertently, Gongsun Ruo's appearance came to mind, and he seemed to be still teasing him: "You stupid!" The sound of tinkling water in the abyss sounded in his ears again!

Hey!

Water, is it okay to use water? The thought popped into his head. He stopped at his feet and hurriedly said, "Wait!"

Du Feng raised his eyebrows and said in surprise: "Brother Liu has found something?"

Liu Yiwen thought carefully in his mind, and came to the cylindrical glass tube again. Du Feng saw that he looked serious, and he didn't bother, and let him look at it.

Liu Yiwen looked up along the tube, and there was an opening at the end, and he thought to himself: Sure enough!

He turned back to Du Feng and said happily, "Brother Du, I think I know what's going on!"

Du Feng said excitedly: "Really?!What should I do if I say it quickly?"

After Liu Yiwen finished speaking, he took out two gourds and handed one to Du Feng, who said puzzledly: "Brother Liu, what does this mean, I have already tried it with wine, but it is useless." ”

Liu Yiwen smiled mysteriously and said, "Come on! Let's try again! This gourd is not wine." ”

Du Feng obviously didn't understand it yet, and said dumbfoundedly: "Oh! It's not wine?

The two of them stood in the air left and right, slowly pouring water from the ears of the porcelain bottle, and after a while, the small ball of the glass tube was submerged by the water. There was more and more water, and the little ball actually floated, Du Feng was stunned at first, and then happy, and said with annoyance: "Why didn't I think of it?"

Winemakers know that wine is lighter than water, and the ball sinks in the wine, but floats up in the water. It turns out that the mechanism here is actually to open the stone door after the ball floats.

The ball slowly reached the top of the glass tube as the water level rose.

There was a soft crunch, and the ball rolled down, followed by a creaking sound. Shimen woke up like a strange beast that had been sleeping for a long time.

Then there was a slight tremor on the ground, and the stone door slowly moved from the middle to the sides, and opened!

Du Feng was overjoyed and said: "It's done!"

Liu Yiwen was no exception, and hurriedly looked inside!