Lao Duan was a little nervous for Li Guanghan at this time. "Researcher Li, don't go down yet, or I'll come first. If something happens to you, I can't handle it. ”

"How's that going to work? I've been down before, and I'm measured. Li Guanghan raised his eyebrows, patted Lao Duan's shoulder, and slid the safety rope to his waist.

There was water at the bottom of the cave, and it was still living water, but there was no inlet or outlet to be found. The light on Lee Kwanghan's head shone on the cave walls, and he found that the exquisite murals had been half submerged by the water, and the stone poles and stone gear grinding discs were all submerged under water. Fortunately, Lee Kwang Han can tell that the water is not very deep.

Chen Aili and Lao Duan, who came down later, also looked at the cave with great curiosity. Chen Aili carefully observed the direction of the water flow and judged that the water inlet and outlet should be under the stone millstone, and it seemed that the biggest mechanism was here.

Standing in the water, Li Guanghan groped for the stone pole underwater, and recalled in his mind how he had used his luck the last time he pulled it.

As his hands gripped the stone pole, he could feel a force tugging at his hands, and it seemed that it was not he pulling hard, but the stone pole starting to activate on its own.

"Huh?!" Accompanied by Li Guanghan's exclamation, a rush of water suddenly sounded. The water in the cave swirls under the stone millstone, and quickly flows away, as if it has been sucked dry, and finally makes a "squeak" sound.

"The last time we came, there was no water, is it because I brought in the water after I pulled the stone pole last time and turned the grinding disc?" Li Guanghan carefully observed what else was changing in the situation inside the cave.

"Ahh What a beautiful mural! "It was the first time that Chen Aili and Lao Duan had seen such a colorful and lifelike mural so closely.

Six peaks like lotus petals, red and white temples on the mountains, practice caves on cliffs, castle-like earth forests and grottoes, living bodhisattvas, Dharma protectors, and flying. Although some of it is soaked in water, it still shines brightly and shines. The landscapes and Buddha statues decorated with turquoise powder, red coral powder, pearl powder, lapis lazuli powder and other gemstones are three-dimensional and vivid.

"Ah, is this the 'Kunlun Sage' that often appears in your dreams?" Chen Aili excitedly pointed to the person on the mural with a high bun, wide robe and big sleeves, and waving his hands.

"Yes, I think he is the 'Kunlun Wise Man', exactly like in my dreams."

"Ha, no wonder this cave is only something you can handle, Dare is another dragon gate array you laid in the parallel universe." Chen Aili didn't expect such a coincidence.

"Chen, if you look down, there are more coincidences."

Chen Aili followed the part of Li Guanghan's finger to the mural. 'Huh?!' Dharma Eyeballs'! Ah, really! ”

The hexagonal prism standing on the lotus petals is the Dharma eye that is exactly the same as the entity. Chen Aili wore it around her neck, so she naturally wouldn't admit her mistake.

"Teacher Li, it seems that our hard work to find the 'Dharma Eyeball' is indeed worth it."

After the water was drained, the situation in the cave was the same as last time, where are the ancient relics of the old master?

Li Guanghan paced around the stone pole and stone mill, since it can enter water under it and can come out of water, will the stone gear grinding disc be a thing like a valve? What's hidden underneath?

Li Guanghan's hands gripped the stone pole again, and the stone pole began to tremble slightly, and the stacked gears slowly turned, and the grinding disc was pushed.

A crack began to appear in the wall covered with murals, slowly pushing open to both sides. This is like the picture in a very bright tomb-themed movie, the three of them were stunned, and their hearts were in their throats. What's behind this mural? Monster? Abnormity? Corpse? Coffin? Viper?

Chen Aili was still a little scared, and she subconsciously grabbed the corner of Li Guanghan's clothes. Although Lao Duan is a veteran, it is also the first time to experience this strange thing, he subconsciously wants to pull out his gun, and when he touches his waist, it is empty.

The wall was completely opened, and a simple, smooth and clean chamber looked like it had just been cleaned. There are no sudden ghosts and zombies, and there are no coffins, just a rectangular table common in ancient China. The two ends are slightly upturned, the lines are simple, and there is no superfluous decorative ornamentation.

Li Guanghan gently touched the rectangular bar, which was cold and piercing, smooth and hard. It turned out that it was not made of wood, but carved from a large piece of petrified wood, a fossilized wood that is hundreds of millions of years old. Petrified wood is a fossilized tree that was replaced by silica in groundwater after a tree was buried in the ground hundreds of millions of years ago, and is stone rather than wood.

The rectangular strip was very thick, and Li Guanghan looked closer to its surface, and found that there was a thin rectangular crack on it, and the edge was finely polished, as if it could be lifted, indicating that there should be a groove in it.

Ah, maybe the ancient relics are inside. The three of them managed to gently pry open the petrified wood cover, and a dark guqin jumped into view.

"Guzheng?" Lao Duan rushed out. "What the hell are you doing with this thing?"

"It's not a guzheng, it's a guqin. An aristocratic musical instrument of ancient China. Chen Aili corrected Lao Duan's words. She knew this kind of guqin, and when she was in school, her mother also asked her to go to the Children's Palace to learn for a while, but now she has forgotten it all.

"Guqin? Musical instrument? Ancient relics? How is this possible? I'm not a musician. Li Guanghan's confused gaze met that of Chen Aili and Lao Duan.

This is a five-string guqin, with a pitch-black body, dense texture and soft flexibility, exuding the quaintness and charm of gloomy wood. This gloomy wood, also known as ebony, is known as "plant mummy" and "oriental sacred wood", which is a wood that has been buried in water or silt for thousands or tens of thousands of years. The whole body is intact, and there are faint ornaments on it, which cannot be seen clearly in the secret room.

Chen Aili touched the body of the piano and said: "The five-string guqin is a sign of ancient times, and the legends from Shennong to Fuxi are all five-stringed. "Shangshu" said: Shun plays the piano of the king's strings, sings the poetry of the south wind, and governs. It's just that in the Zhou Dynasty, King Wen added a string, and King Wu added a string, which became seven strings, which have been used to this day. In this way, it is really possible that this is an ancient relic. ”

"Researcher Li, can you try to pluck it and see if you can make a sound?" Lao Duan's curiosity came up.

There was a quiet and distant voice, and an ethereal and peaceful voice floated out from Li Guanghan's fingertips at will, and everyone was shocked, like a spring breeze.

But what can the guqin teach me?

Li Guanghan became more and more confused, he racked his brains to search for the knowledge stored in his memory, and the more anxious he was, the more clueless he became.