The intermittent flow of water is reflected by the fluorescence in the cave, if there is nothing, the water droplets drip on the reef shore, making a "tick-tock" sound, but the sound is weak, covered by the sound of the underground dark river, if you don't listen carefully, it is really easy to ignore. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

Nan Zhiqiao looked up at the place where the water came from, a hidden hole, and there were many firefly larvae attached around the hole, a circle of yellow-green faint fluorescence.

Fluorescence lingers around the entrance of the cave, which is small and almost round, and by the faint should, you can see a raised stalactite above the entrance.

"Senior Nan, there's a hole in it, and I don't know where it leads?"

"Just go up and have a look. ”

"How do you go up, this distance is more than three meters high, right?" Ye Zhenzhen looked at the distance between the entrance of the cave and the ground, and she would definitely not be able to go up without tools.

Nan Zhiqiao untied the backpack behind him, took out a glow stick from the backpack and pinned it to his waist, and took another one and stuffed it into Zhen Zhen's hand.

Seeing the glow stick, Ye Zhenzhen was quite surprised, "Senior Nan, you still have a glow stick? I haven't seen you buy these things in the outdoor goods store before." ”

Nan Zhiqiao took out the mountaineering rope that tied the two of them just now, and pinned it to his waist, and replied at the same time: "These equipment have been with me before, and I originally planned to go to the wild pine ridge unmanned sinkhole with a few travelers, but I didn't expect that although I changed my itinerary, I was washed into this underground cave with you, and it was also crooked, just right to use." ”

"Sinkhole exploration?

"Well, when exploring in the field, glowsticks can be used to detect uninhabited caves, for a dark bottomless hole, you can throw the glow sticks down, according to the trajectory can determine whether the bottom is rock or water, and you can also estimate the depth of the cave. ”

"Oh, I see, but now that this hole is on top, how are we going to get there?"

Nan Zhiqiao lifted the sleeve on his wrist, "Use this." ”

The wire rope on the wrist had saved the lives of two people in the dark hole in the grass before, and now it was just used to hold on to the fixed hole, so that they could climb up the wire cable.

Nan Zhiqiao lightly pressed the automatic device in his hand, and the wire rope instantly hooked the stalactite next to the hole at the top, and pulled the wire cable vigorously, which was very firm.

Nan Zhiqiao handed his backpack to Ye Zhenzhen and instructed: "I'll go up to investigate the situation first, you wait for me here, and blow the lifeguard whistle when you encounter the situation." ”

"Hmm. ”

Ye Zhenzhen took a glow stick and a backpack, stood in place, and looked up as Nan Zhiqiao followed the wire rope little by little to reach the entrance of the cave, which was very narrow and could only allow one person to pass at a time.

Nan Zhiqiao passed through the hole, put away the tightrope, and shouted to Zhen Zhen on the ground: "Zhen Zhen, don't leave when you are there, I will definitely be back in twenty minutes." ”

"Oh, Senior Nan, you have to be careful. ”

Seeing Nan Zhiqiao's figure disappear into the cave at the top, the entire underground cave was quiet again, except for the sound of water droplets, it was a strange yellow-green fluorescence, and only now did Zhen Zhen's heart begin to be truly afraid.

All kinds of speculations came to mind, what would Senior Nan encounter at the entrance of the cave? There wouldn't be any mysterious and dangerous creatures, would it? I don't know what place the entrance of the cave was connected, could it be another mysterious cave, or was it a dead end?......

Ye Zhenzhen thought wildly, the time of twenty minutes seemed extraordinarily long at this time, the fear in Zhenzhen's heart became heavier and heavier, and in the end, she didn't think about any life and death retreat at all, just thinking that Nan Zhiqiao could come back safely.

Twenty minutes passed, and Nan Zhiqiao appeared at the entrance of the cave on time.

Ye Zhenzhen held the lifeguard whistle, overjoyed, and shouted happily: "Senior Nan, you are finally back." ”

Nan Zhiqiao lowered the climbing rope that was pinned to his waist from the hole, and one end of the rope just hung down to Zhen Zhen's feet, "Zhen Zhen, tie the two backpacks to the rope first." ”

Ye Zhenzhen did so, and the two backpacks were pulled over the entrance of the cave, and finally tied the rope around her waist, half-climbing and half-dragging to the entrance of the cave.

Nan Zhiqiao helped Zhen Zhen, who had just climbed up to the entrance of the cave, and began to explain: "This underground cave has at least three layers, and there is a layer of underground dark river below, this is one layer, and there should be another layer above. ”

Ye Zhenzhen held the smooth and moist stalactites around her and asked, "Waterfall? There will be a waterfall in the cave? ”

"There is a waterfall, it means that there is a huge drop, there is likely to be an exit, just now the time is pressing, I am afraid that you are worried, did not go to the end of the waterfall, do not understand the situation, now, the two of us go to find it together." ”

Ye Zhenzhen was glad in her heart, fortunately Nan Zhiqiao came back in time, otherwise she would have been crazy with worry.

The two of them each held a glow stick in their hands, and with the faint light of the glow stick, they walked all the way forward in the narrow karst cave.

The cave was very narrow at the beginning, only allowing two or three people to pass through, and the height was not more than one person, and after walking more than 100 meters, the cave suddenly became open, as high as two people, and the width was more than two meters, and the feet were flat.

The sound of the water was getting louder and louder, and Zhen Zhen couldn't help but ask: "Senior Nan, there is no water at all in this cave where we are, and I don't know where such a loud sound of water comes from?"

Nan Zhi Qiao is holding a light stick in front of him, the rock wall in the cave is covered with cloud-like patterns, like brocade and satin, gorgeous, Nan Zhi Qiao said while walking: "This underground karst cave, there are holes in the holes, the caves are connected, the holes are on the holes, the holes are under the holes, the holes are exquisite and weird, this waterfall may be in the place where the holes are connected to the holes." ”

The two groped their way forward, and the sound became louder and louder, like rumbling thunder, and what was even more surprising was that there was a glimmer of light in front of them.

If there is light, it means that there is an exit to the outside world, and it is estimated that the current time should be around six o'clock in the morning, it is dawn, and the two of them are suddenly full of hope, and their steps are also speeding up.

After walking a short distance to meet the light, I came to a cave, and the sound of rumbling water came from the mouth of the cave.

The two of them cautiously approached the entrance of the cave, looked out, and couldn't help but be stunned.

I saw that outside the entrance of the cave is a huge sinkhole, the sinkhole is approximately circular, the diameter is two kilometers away, the sinkhole is very deep, up and down there are hundreds of meters of height, and the hole where the two people are hanging is hanging at the waist of the sinkhole, not up the world does not touch the ground, countless waterfalls gush out from the stone walls around the sinkhole, like a white curtain pouring down, and finally merge into the pool under the sinkhole.

Ye Zhenzhen poked her head out of the hole, leaned down and looked down, the waterhole below the sinkhole accounted for most of the area at the bottom of the pit, and the waterfall water that continued to flow in accumulated in the waterhole at the bottom of the pit, there was a little green shadow in the center of the pool, and if you looked closely, it was the crown of a tree, which was almost submerged by the pool water.

Due to a flood at night, the water at the bottom of the pit also became a little muddy, and Ye Zhenzhen couldn't help but sigh: "The rainstorm has stopped, but how do we go down from the mouth of the cave?"

There was no response for a long time behind her, Ye Zhenzhen looked back at Nan Zhiqiao, but found that Nan Zhiqiao was looking up, and Zhen Zhen couldn't help but look up.

Everywhere her eyes went, Ye Zhenzhen couldn't help but exclaim: "Ah...... What's that dense stuff on the cliffs?"