It took two hours, about 2 years to go. 5 kilometers, the pit finally came to an end, but there was something in front of them, which stunned everyone.

Seven beams of light illuminate this small space, which is less than 3 meters wide and only 2 meters high. I saw that on the ground in front of me, there was an iron chain the thickness of a human waist. The chain had been cast for an unknown amount of time, and it was pitch black throughout, reflecting an ominous glow in the light.

Everyone but me was amazed. The hippie smile of the earth hat touched the iron chain with his fingers: "This thing is actually the real thing, I didn't expect that this kind of chain is still needed in the coal mine to bolt the watchdog?" ”

"What kind of guard dogs can be chained with a human waist, I don't know. No creature can bear this weight alone, and elephants will be crushed. Zizhu likes to raise the pole with the earthen hat the most, and I don't know if this girl likes him or really hates him: "Obviously, there is no need for iron chains in the coal mine, maybe it is part of the ancient tomb mentioned by Mr. Ye." ”

The girl's mind is delicate, and she guesses the truth with a casual guess.

I looked at the chains and didn't speak for a long time.

"Look at the front of the chain, it's clear that something has torn it off with brute force." Han pointed to the broken iron chain, because the iron is malleable, so if you pull hard, the broken position will be elongated. The chain was clearly twisted by some great force.

I had already known about the existence of the iron chain from Li Ming's mouth, so I wasn't too surprised. Just kind of figured out what the use of chains is. Could it be that one end of it is really tied to something? What would make someone stop the action with a chain as thick as an adult's waist? Could that be the caretaker of the mystery deep beneath your feet? After breaking free from the chains, where did that thing go? Dead, or is it still active in the vicinity?

"Hurry up, it's getting dark." Ganges looked at his watch, a quarter past seven in the afternoon.

The group gathered their surprise and began to plan their next step. The chain is almost vertically downward, and the hole starts to dig vertically downwards from here. The reason why I wanted to bring in an expert with experience in vertical slipping was for the next part of the trip. The relevant information has already been given to the old gun, so he arranged it in an orderly manner.

The chain is more than 60 meters long from end to end, and then there is a small platform that was dug more than ten years ago. This means that in the first stage, we only need to descend 70 meters high. After a few more deep and shallow piles were made to fix the rope, Ganges turned on the searchlight, installed the slide lock and safety device, and then slowly descended.

It didn't take long for his voice to come over the intercom: "OK below, the platform is very large, more than 20 square meters." I'll answer at the bottom, and you'll go down one by one. ”

The old gun nodded, then checked the security measures on us again before motioning for me to go down. The slide lock itself is built-in damping, so the speed of the slide is unhurried. It took half a minute for 70 meters, and then I stepped on fairly solid ground.

Immediately after Gong Ruya, after the four of them arrived safely, I breathed a sigh of relief and began to look around.

The platform had apparently been widened several times, and there were traces of various excavations on the ground. The space is bottle-shaped, with a small entrance and a large bottom. The strange chain was fastened to a wall of iron beneath his feet.

This mysterious place is 130 meters deep into the mountain, and it is simply unbelievable. How did ancient humans thousands of years ago transport so much molten iron to this remote location and pour it on the walls to form a strong cage? I can't explain.

The old gun and the others were amazed, and they looked forward to the ancient tomb under their feet. The iron wall was cut into a square hole about three meters wide, revealing the dark space below. Just standing around, you will feel a chill coming out, so cold that your bone marrow will freeze.

"I'm afraid it's only about two degrees here, it's incredible, it's obviously summer." Zizhu shuddered, and hurriedly took out his jacket and fleece jacket and put them on. Everyone was so cold that they couldn't stand it and followed suit. After I got dressed, I took out the thermometer and put it on the ground, and after 30 seconds, I looked over and saw that it was close to freezing, and there was still a big ice cellar down there.

"Ganges, measure the height." The old gun stepped on the iron layer at least a meter thick with his foot and commanded.

The Ganges, who was relatively silent by nature, escaped from the laser rangefinder and leaned in front of the cave to press the switch. Soon the number 173 was displayed on the screen.

"One hundred and seventy-three meters high." Ganges frowned: "It's my limit." ”

The old gun smiled and patted him on the shoulder: "Fortunately, I brought a two-hundred-meter-long rope. After a short rest, we continued on our way. ”

At 8:50 p.m., the correction was completed. Since the ground is made of iron, Lao Gun and others have driven piles on all four walls as safety points to fix the ropes, which is very strong. The rope was thrown down, and a few more glow sticks were thrown down. At the top of the cave, only the glowsticks emitted a faint green light, and then they were swallowed up by gravity, and finally the fragile light disappeared.

It is still the Ganges that goes first. He fastened the small tank of oxygen cylinders to his breast pocket, bit down on the inhalation tube, and slid down.

The man above held his breath as he was swallowed up by the deep darkness, and soon only a faint point of light remained. More than ten minutes later, the walkie-talkie rang.

"It's okay down there, the air isn't muddy, you don't need an oxygen cylinder." The words of the Ganges are a lot more reassuring to everyone.

It was still my second slide, more than 170 meters, the whole person was dangling in the air, and I couldn't see any depressing feeling of scenery up and down, which forced people to go crazy uncomfortably. It's no wonder that cave speed skating is not something that ordinary people can play, and guys with a slightly worse heart can scare themselves to death.

Once again, I let out a long sigh of relief as my heart beat as fast as I jumped out of my chest.

Ganges motioned for me to take my own chances, and then spoke to the intercom: "Next." ”

When I finally came to the end of the trip, I naturally took a look at the nearby scene as soon as possible. The miner's lamp overhead shone brightly, but in this large, incomprehensible space, it was still like a weak match, illuminating only a small area.

Looking around for a moment, I got some general impressions.

The place is like a natural cave, so large that you can't see the edge at all. We don't know where we are in the cave where we slide down. From a distance, the further east you go, the more traces of artificial construction there are.

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