"It's a vertical ladder." The fat man, who went down first, stopped the footsteps of the people behind him in a deep voice.

"See what other ways to go?" The old man shouted in the pool.

"No, I can't get down here." As soon as the fat man said it first, he immediately changed his tone and asked, "Why don't we try it with a descender?" ”

"What is this?" At this time, I also climbed up, and saw a huge space in the distance, Wang Lei, Xu Ming and the fat man stood side by side on the embankment, and the darkness extended infinitely in front of them and finally disappeared. Below us is a staircase at an angle of almost 90 degrees, and down the cave is a stone slope almost perpendicular to the ground, and finally we can see some piles of rocks, which have accumulated over the years from the rocks that have gradually fallen off in the cave, and they continue to get stuck in the middle of the vertical road, and finally form a strange rock wall. In addition, the flow of air currents and the erosion of groundwater have caused varying degrees of damage to this place.

I could see that the rock wall formed by the rubble pile was the only place we could settle down on this bottomless slope.

"It's not completely vertical, you can go down slowly." Wang Lei chewed his cheeks and muttered.

This is the only way to go down, unless you don't want to go to the place below, but then the strange behavior of the person in the video can be explained, he is unwilling, he knows this place but can't go down, he comes back again and again to make himself die. I sat down, my feet in the air, listening to the sound of the wind blowing from afar, passing through the gently sloping pavement.

With a snap, I saw the old man come down from the staircase below with a stone and play with it in his hand.

"What is this?" I wondered.

"It's calcite." The fat man glanced at the stone in the old man's hand beside him, "Calcite is a widely distributed mineral, so it's not uncommon to have it here, but what I care about is the degree of erosion in this area, if the water flow alone is not so damaging in the vertical area." Yes, and the air currents, the air currents here are different, have you noticed? The fat man felt it with his eyes closed.

"This part of the cave used to be like this because of the water that penetrated the limestone crevices." The old man said, "After that, the river was forcibly changed, so that there is no erosion of the water now." ”

"Traces of artificiality?" I wondered.

"yes?"

"Won't it?" If this place is also built by hand, how much time and manpower and material resources will be spent? And isn't it strange that such a large project has not gone down in history?

"It's been a long time, and the surface of the rock is covered with a layer of clay that is difficult to dissolve, although I know that this is not man-made, but my first instinct is that this is a very effective place to preserve murals." The fat man smeared his hand on the wall nearest to him, and the dust flew everywhere.

The vast frescoes have been rediscovered in the abandonment of time, and their brilliance still shimmers after centuries of burial. The mural features cows, reindeer, cave bears, wolves, and birds. The size of the screen varies, from the elder being about 5.5 meters to the short one being about 1 meter. Most of the pictures are silhouettes with thick lines, that is, the volume and weight of animals are rendered in red, black, and brown within the outline of black lines, and the images are vivid, and the colors are bright and vibrant. There are also some shallow carvings in the cave that are outlined with sharp tools.

"Primitives?"

"Yes, it's a natural underground space, but it was also inhabited." The old man said to me.

Suddenly it occurred to me that the huge polyp was hundreds of millions of years old, and if this cave really existed in ancient times, maybe the two things really fit together.

"Xu Ming, you go down." Wang Lei suddenly said, "This time it's really a cave exploration, don't be careless." ”

"Order." Xu Ming smiled and walked over slowly, he was carrying a bundle of static ropes on his shoulders, holding an ascender and a descender in his hands, his costume was not fully dressed, but he was wearing a caving helmet crookedly, "I'll go down first and take a look, I'm afraid I won't be able to stand too many people when the rock is loose." After all, I rarely see such a horizontal rock wall formed by the accumulation of stones, and I guess it is not reliable. ”

"Let's go down and see." The old man sighed and admonished, "If it doesn't work, don't force it, let's make plans again." ”

"Knee pads and elbow pads?" Wang Lei took out the pedal belt and seat belt from his backpack, installed a headlamp on Xu Ming's caving helmet, and knocked on the "halogen lamp and LED together, turn on the halogen lamp for a short time." ”

"I want you to talk nonsense." Xu Ming seemed to be greatly despised and knocked off Wang Lei's hand.

Xu Ming looked at the terrain and quickly fastened the seat belt at his waist, hung up the iron lock, and then connected the descender to the iron lock, holding the descender with his left hand, and holding the main rope from the descender with his right hand behind his hips. A series of actions is done in the blink of an eye. The people on the side were a little dumbfounded, he faced the rock wall, his legs were separated at an angle of about 60 ° ~ 80 °, climbed the cliff wall, leaned back, he could not simply rely on the rock wall to support the direction of the fall, he could only slowly be controlled by his own small swing.

Time passed little by little, Wang Lei kept communicating with Xu Ming with a flashlight, 5 minutes passed, Xu Ming's figure was still in our sight, and there was still some distance from the horizontal rock wall. But suddenly he shook the rope very quickly, and scared us all, and when we looked down, we saw him grasping the rope with one hand, and slowly descending at first, and then he glanced at the lot below, and his hand shrank and released, and fell down quickly.

Then the iron rope above tightened, and began to make a clattering sound, and soon a voice came, "There is a wide range below." ”

"It's really a second cargo, and I don't even bring a walkie-talkie."

He doesn't need anything like that, because they rarely have time to be alone, and they mostly communicate with each other in crisis situations. The old man smiled behind Wang Lei, "Xu Ming is different from us. ”

"The rock is firm enough to settle on." Xu Ming's voice came from below, "Good for breathing, the light flame is normal." 22 percent oxygen degree. Come down. Take your time one by one. ”

"Hey, is that okay?" Because of the light below, I could see the distance completely, so I was a little dizzy.

"Don't be afraid." The fat man slapped me suddenly, and I was so frightened that I immediately hugged him.

"The terrain here is complicated, and you definitely don't fall down so easily."

"Don't it, it's the same as going into science. You look straight down and straight, which door do you say is complicated? "I moved back a little until I felt the water rush and didn't stop.

"Afraid of what?" The fat man squatted down and persuaded me bitterly, "You're afraid, it's boring for us to go down, isn't it the place you want to go to the most?" ”

"I want to go, but it's not this way." I said indignantly, and I didn't forget to scold the fat man, "." ”

"That's it." The old man interrupted our conversation, "All the equipment is on, you can't be like Xu Ming." ”

"Got it." Wang Lei replied while beginning to forget all kinds of hole-entering equipment.

Necessary Equipment for CavingAs a challenging sport, it is essential to provide safe equipment. Caving equipment is common to mountaineering equipment, but things like caving kits are unique to caving. I was covered with equipment, tightened ropes, stood at the top of the darkness, and looked into the distance, like a dragon crouching on the top of a mountain, looking at everything, I felt that I was already lv80. In addition to the caving headlights, safety belts, pedal belts, descenders, ascenders and main ropes that were taken out for Xu Ming to go down first, caving helmets, caving clothing, caving bags, and auxiliary ropes are also essential.

In addition, the fat man also took out light sticks, large candles, multi-functional knives and first-aid kits and marker chalk and guide line diagrams from his treasure bag one after another.

"The things are distributed, you go down with me." After that, the old man was the first to descend.

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