This underground passage was built entirely with the help of a large karst cave inside the original mountain.

It is also a karst landform, similar to the underground cave under the Cologne Mountain, the largest of which is also tens of meters high. Inside the cave is an underground river with a strong current, which contains rafts made by Liu Guodong and Lin Zhumin last year.

Several people took a raft and walked along the river for several kilometers. Then go ashore and burrow into a smaller cave. After walking a few hundred meters, the front suddenly opened up, and the exit was actually built under a large rock, which was very hidden. It's a mountain away from the riverside base, but it's already an untouched rainforest.

The primeval rainforest is a lush type of forest, and when you enter the forest, you come to a mythical world. Although it is the dry season, I can't see the blue sky here, my eyes are full of moss, the dense forest is damp and stuffy, and my feet are slippery everywhere. It is dimly lit, and people walk in it, which is not only difficult, but also dangerous.

Quiet caves, rushing streams, towering trees, tangled vines and lush flowers and plants are intertwined into a green labyrinth. Unlike the Kodescent, it has not been harmed by defoliants, and the forest has a multi-layered structure.

The upper arbor is more than fifty or sixty meters high, mostly typical tropical evergreen trees and deciduous broad-leaved trees, the bark is light, thin and smooth, the base of the tree often has plate-like roots, and flower branches can grow on the old stem. Large woody vines and epiphytes are particularly developed, with some mosses and lichens epiphytic on the foliar surface, and woody ferns and large-leaved herbs in the understory.

The subcanopy is composed of small trees, lianas and epiphytes such as orchids, bromeliads and ferns, some of which are epiphytic and entwined around parasitic trunks, while others rely only on trees as supports. The surface of the ground is covered with branches and fallen leaves, and underneath is a thick layer of humus.

They followed the path that the loggers had trodden through a hill. The forest path, with the woody vines that stood in its way, had been cut off. These plants, some of which are as thick as 20~30 centimeters and as long as 300 meters, climb from one tree to another along the trunk and branches, climb from the bottom of the tree to the top of the tree, and hang upside down from the top of the tree, intertwined, like a dense net.

Epiphytes such as algae, mosses, lichens, ferns and orchids attach themselves to the trunks and branches of trees, shrubs or vines, as if they were covered with a thick green coat, and some also bloom with all kinds of gorgeous flowers, and some even epiphytes on the leaves, forming a wonderful scenery of "trees on trees" and "grass on leaves".

When climbing the second mountain, the mountain road takes a big turn. Lin Tao thought it was too boring to walk along the mountain road, so he wanted to walk in a straight line. "Ghost, it is recommended to cross in a straight line!"

"Wait, it's not quite right!"

Yu Songyuan and Zheng Shuwen walked more than ten meters behind them, and just now on the top of the mountain, they had already seen the forest farm headquarters camp in the mountain stream below, and Yu Songyuan was also bored to take a big bend. But before he could answer, Liu Guodong looked at the misty forest and issued a warning.

The trees here are a bit strange, and the base of the trunk is almost always full of colorful plate-like roots, which protrude from the base of the trunk a few meters and spread radially downward. Banyan trees, on the other hand, have many well-developed aerial roots that hang down from the trunk and are spectacular. The grass in the forest is dark in color, and the moss on the ground is also black, and from a distance, it is blue-black from top to bottom, which is a bit terrible.

Just feeling that the madness was not enough to stop Lin Tao and Lin Zhumin, seeing that Liu Guodong couldn't say why, the two took the lead in leaving the forest mountain road and went directly to the forest. But after only walking a few dozen meters, the more the two of them walked, the more weak they became, and the more they walked, the more frightened they became, as if they had entered hell on earth.

The trees, vines, foliage, moss, etc., are all sticky. From the treetops to the moss on the ground, it was densely turned, and all of them were crawling with leeches. Perhaps it was the smell of people that attracted them, and from time to time the trees were like bullets, black balls were shot at people, hitting everyone's combat uniforms or equipment bags, making a "pop" and "pop" sound.

Among the dead leaves, grasses, and moss on the ground, countless black leeches shook their heads and bent and stretched out to move closer to people. The big ones are more than two inches long, the thickness of the pen shaft, and the small ones are only as thick as silk threads and the size of rice grains. In just a moment, everyone was hit accurately many times by "pop" and "pop".

As soon as the team entered less than 100 meters, the witch and Merlin let out screams of "ah" and "ah" from time to time. Although the witch is evil, she is a young city girl in the end, and Merlin is even more pampered, and the two of them are panicked by this little animal. In particular, there were some tree leeches, which accurately hit their necks in the sound of "pop" and "pop", making them jump in surprise and have nowhere to hide.

Seeing that the combat boots and the trouser legs of combat uniforms were already crawling with black leeches, both of them trembled and panicked, and they couldn't move their legs. After entering the Indochina Peninsula for such a long time, they have already seen leeches, but so many leeches gathered together still make them chill.

In fact, as long as the leech bites a person, it will fall off on its own as long as it is full of blood. But a bite from this thing can cause a bacterial infection. "Ghost, I can't go any more......" Liu Guodong reluctantly suggested.

"Retreat to the mountain road!"

The power of nature was chilling, and Yu Songyuan had no choice but to order a retreat.

After the team quickly fled back to the forest mountain path, they began to remove leeches from each other's bodies. Separated only 100 meters away, the plants on both sides of the road here are luxuriant, the flowers are red and willow green, and the forest is like a night difference. The leeches burrowed into their clothes, and everyone had to take off their combat uniforms and remove the hateful little insects from the inside out.

Although it has only been in the forest for a short time, some small bugs have already burrowed into the collar and combat boots. Several people were busy at once, and finally cleaned up. What is puzzling is that the leeches that were cleaned up all stretched out and shrunk in a panic and fled into the forest. On the other side of the forest road, there is none.

"Why is this place so evil?" Lin Tao asked inexplicably.

"I can't tell why, maybe it's because of different plants." Seeing that everyone was looking at him with puzzled eyes, the almighty Liu Guodong didn't know what to do. He looked at the dark forest and said with a sigh of relief.

Next, they honestly followed the forest path carved out by the lumberjacks, climbed the hill with difficulty, and entered the secret camp of the forest farm headquarters. The camp is surrounded by a fence made of thick logs, and there are five or six bamboo buildings on stilts, and the spring water that is drawn down from the mountain with bamboo tubes leads to each of them through bamboo poles and pipes.

Their arrival surprised the tribal warriors.

In normal times, their main task is to cut wood, cut timber, use a tractor through improvised forest roads, drag it to the Majiang River, and then make a raft and go down the river. After arriving near Bambahang, they were grouped together on the river, and then floated from the water to Langlong in Annam, and then transported by car to various timber processing factories in Annam.

Most interestingly, there are also more than a dozen well-trained elephants in this base. These elephants have been trained, and after cutting down long logs and cutting off branches, an elephant can easily wrap the trees with a big trunk and tusks and load them onto a tractor, like a crane.

Seeing these elephants, everyone remembered the anecdote of Liu Guodong conditioning Annan's military advisers at the Cologne Forest Farm. The witch was puzzled, so Lin Tao added oil and vinegar to describe it, which made the witch laugh almost out of breath, and gave Liu Guodong a burst of chestnuts.

When I arrived at the forest farm, I learned that this was a leech mountain. The entire hillside is full of dozens of tons of leeches.

Long Biao was heavily punished with forty military sticks, his skin was open, and he could only lie on the couch to receive the team. He first invited Merlin and the others to sit down, and then explained that the average annual temperature in Lancang is about 26 degrees Celsius, which is very suitable for the growth of this animal. It can grow in water, as well as in terrestrial grasses or trees, and is highly adaptable.

This hillside is called Leech Mountain, which is very strange, and this mad play grows in this forest. The rest of the surrounding area, none. When the headquarters of this logging yard was first opened, several workers strayed into the mountain and were stung and covered in blood. Later, a detour opened up the current forest road.

The brothers stayed here for a day, and the next morning, they went through the underground passage leading to Anzhou. This underground passage also uses the karst cave at the bottom of the mountain, but it is not as lucky as the previous one. There is no underground river here, and it is entirely on foot.

"How did you find this underground passage?" Lin Tao asked.

Liu Guodong said: "Before going abroad, Xu Tianyi specially took us to visit an old comrade-in-arms of her father. A few years ago, this old comrade-in-arms went to the Lanvicissitudes of life with the engineering unit of the Kunming Military Region of our army to repair roads. Highway 13 and Highway 6 were built by them back then. He drew us a sketch in which we were specifically asked to look for the underpass from that time. ”

"When we arrived, we searched for a month before we found our first tunnel. So, we took the base of the forest farm as a foothold and began to look for a second passage. The entrance was finally found, but due to the earthquake and other reasons, it collapsed and blocked in many places. We organized tribal warriors and spent two months of construction before it was completely opened. ”

Lin Zhumin added, "We infiltrated Annan to rescue Sister Xu's lover through this strategic channel. ”

They walked through the tunnels for two or three hours before they reached the exit. Lin Zhumin knocked on the wooden door at the entrance of the tunnel, and after a while, the thick wooden door opened from the outside. He took his gun and drilled out of the hole for a while, and then returned to tell them to come out of the hole together. Walking out of the cave, they were pleasantly surprised to find that the entrance to the cave was actually built on the second floor of a bamboo building. Outside the bamboo building, there are all kinds of raw hides.

A middle-aged hunter couple warmly invited them to sit down for tea.

Lin Zhumin said, "This eldest brother and sister-in-law are both our people, the eldest brother is called Shangjie, and the sister-in-law is called Ruan Pingping." Renjie's eldest brother and Pingping's sister-in-law, both of whom are overseas Chinese whose ancestral home is Fujian Province of our country, were driven here from the south of Annam a few years ago, and their property was confiscated. Next to this river valley live are all overseas Chinese or refugees caused by border wars, and opposite the river valley is the county seat of Anzhou. ”