"Don't you think there's no point?" For Su Tina's change of words, Huo Yu was seriously surprised.

"What if, in case I find any new species for you, I don't want my name to be on it when future historians write this." Sutina said reluctantly.

"Yo? Are you relieved? ”

Huo Yule said: "Do you think there is a dragon?" ”

"No dragons! But there may be a peculiar salamander, an amphibian, living underneath. Sutina said.

"Huh?? How do you know that. Song Wenbin was puzzled.

"I told you you don't understand." Sutina sneered.

Song Wenbin didn't know why he was empty-hearted, which annoyed him, obviously he didn't really promise Sutina, why should he be weak-hearted. Also amphibians, don't look for reasons to be so outrageous, okay?

"It's good to go down, I won't let you go down." Song Wenbin said indifferently.

"Hmph." Sutina pursed her lips, upset.

Within a few days of making the decision, a complete set of climbing abseiling equipment arrived. The three of them first contacted some well-known local cave attractions, found some professional instructors, and practiced rock climbing and abseiling in them.

I have to say that the tossing and turning here and there in the past few years has left several people with amazing physical fitness and adaptability, especially the two trainings of deep-sea training and space training, which makes Song Wenbin feel that rock climbing is almost as simple as pediatrics.

Soon, the three of them who had completed the training returned to the Black Dragon Cave with their full equipment, and unlike the previous resistance, Su Tina at this time was eager to try, and kept urging Song Wenbin and Huo Yu all the way.

Song Wenbin buried his head in the rock wall and chiseled the rope nails for descent, thinking that he might be crazy.

After fixing one end of the main rope at the cliff neck, Huo Yu volunteered to fasten the seat belt at the waist, hang the iron lock in front of the abdomen, and then wrap the main rope around the descender in the shape of "eight", and then connect the descender with the iron lock, the upper end of the main rope with the left hand, and the main rope from the descender with the right hand behind the crotch. Facing the rock wall, spread your legs at an angle of about 80 degrees, climb the cliff edge, and start descending first.

Song Wenbin followed, Sutina was the last, and the crew set up several temporary tents at the edge of the cave entrance, controlling small drones to follow the shooting.

The cave is quiet, the cliff is seventy or eighty degrees downward, and there are many traces of water erosion on its surface, but it is very dry to the touch, it should be a change in water level, and it has not been moistened for a long time. However, there are also some small potholes, which are traces of artificial excavation, and the purpose is unknown.

After climbing for a while, Huo Yu at the bottom called softly, "Look, what is this." ”

The two men above the cave looked down, and under the light of the searchlight overhead, they actually saw a long protrusion that snaked downward on the edge of the dark cliff.

This made Song Wenbin's heart raise his throat, could it be that there is really a super species in this world that has not been discovered??? They also took the shit luck and was discovered by them so easily???

But he soon realized that this was nothing more than wishful thinking on his part.

"It's a plank road." Huo Yu said.

On the dark cave cliff, there is a wooden plank road that winds downward and spirals, the plank road has rotted, look at the source, it should extend from the cave entrance, but it is too long, the plank road at the cave entrance has been rotten, and there are still some left below.

"Why is there a plank road here?"

Song Wenbin hung in the air, puzzled.

"I don't know." Huo Yu buckled the wood on the plank road, and it broke as soon as he buckled.

"It may be to hide from the war, or it may be to boil the nitrate, or it may be to live in seclusion, who knows, just go down and see." Sutina said faintly excitedly.

"You're doing it, aren't you?" During the decline, Song Wenbin couldn't help but bury Su Tina.

"No, an underground adventure of an extraordinary journey." Sutina said with a grin.

"Oh, woman, changing your face is like flipping through a book. Mmmm, I don't want to waste time on meaningless things. He pinched his throat and parroted his tongue.

Sutina on top of his head shook her leg and kicked him, and was grabbed by Song Wenbin's ankle. She laughed uncharacteristically, and the laughter echoed through the dark underground cavern, becoming extremely terrifying.

"Don't make a fuss, it's dangerous!"

Huo Yu below reprimanded.

Only then did the two stop fighting, and honestly descended down the rope.

The plank road on the rock wall is hidden from time to time, and you can see a few pieces of wood from time to time, and in some places you can even see holes that have been carved out of the rock wall, in addition to the rotten wood, there are also some rusty small iron cages, Song Wenbin couldn't help but pick it up and look at it when he passed by a wooden frame, and Su Tina next to him looked at it and said, "This is a torch." ”

Torch.....

Song Wenbin looked at the rusty small iron frame in his hand, and then looked at the top, but it was pitch black above, and he couldn't see anything.

Song Wenbin couldn't help but think that I don't know how many years ago, on the wall of this cave, the firelight flickered, and someone walked down the plank road, holding a torch, and walked down from it carefully.

They have already descended nearly 100 meters at this time, and they can dig tunnels on the cliffs 100 meters deep, or in ancient times when science and technology were backward, God knows how much manpower and material resources it would take.

What exactly are they doing? Why go underground?

Song Wenbin couldn't understand the thoughts of his predecessors.

Huo Yu below didn't care about the mess along the way, as a pioneer, she descended so fast that she seemed to be going home, and threw Song Wenbin and Su Tina on it in the blink of an eye.

"Slow down!" Song Wenbin couldn't help but blame: "Hurry up to reincarnate!" ”

With that, he beckoned Sutina and kicked the rock wall all the way down. Half an hour later, Huo Yu's voice came from the bottom, "I've arrived!" ”

Song Wenbin sped up, and soon, he and Sutina also stepped on the solid ground, which was much more spacious than the narrowness of the cave when they first entered, and the ground was full of collapsed rubble, and some towering stone pillars. The tunnel is still going down, with no end in sight, but the slope has become much gentler.

Song Wenbin was watching.

Yikes!!

Without warning, Sutina suddenly turned around and hugged him.

The scent of fragrant and charming hair rushed into Song Wenbin's nasal cavity, coupled with the soft body, which made him react almost immediately.

Song Wenbin subconsciously hugged Su Tina, but he quickly reacted that this was filming a show, where could he do such intimate actions, he quickly pushed Su Tina away, and said powerlessly: "What are you doing!" ”

"Bone... Bone... There are bones..."

Sutina shrunk her arms and said tremblingly.

The gun that had just been fired up was quickly pressed down, Song Wenbin was startled, turned his head to look, and by the strong light of the flashlight, he saw a lot of bones on the ground. At this glance, he also shrank back, and almost went back to hug Sutina.

The bones were left over from an unknown number of years ago, and some of them were deeply embedded in the collapsed rubble on the ground. Almost one with them.

Huo Yu was so bold that she actually squatted down and turned over the bones, and soon, she stood up a little disappointed, clapped her hands and said, "It's an animal's bones." ”

Song Wenbin breathed a sigh of relief.

"What kind of expression do you have!" Sutina exclaimed, "Animal bones are scary, okay. ”

"Could it be a keel!"

Song Wenbin said gibberishly, and he saw a bone with horns.

Huo Yu picked up a skull, looked at it for a moment and didn't see anything, so he threw it to Sutina, who dodged like a bomb and shouted: "Sick!" ”

"Look, encyclopedia, look at what bones." Huo Yu said.

"Don't you recognize this horn? Buffalo! ”

Sutina complained more than once: "Don't throw things around, okay, I'm very timid, and I don't feel sorry for people." ”

Huo Yu touched his chin and thought, "It seems that the old master didn't lie to us, someone has sacrificed here." ”

"Is it the cows and sheep that have been drained of blood?" Song Wenbin crouched down to look at the skull.

"It should be." Huo Yu replied.

"Will there be bats?"

Song Wenbin asked with his neck bent, he looked around, for fear that a large group of bats would fly out of the dark hole and suck him dry.

"Not necessarily."

Seeing that Song Wenbin was afraid, Su Tina immediately cut back to the encyclopedia from the resentful woman, she held up a finger and pretended to be forced: "In fact, vampire bats account for a very small proportion of all bat species, and the vast majority of bats still live on wild fruits and insects. Looking at the whole world, blood-sucking bats only exist in the Americas, and there are in Mexico and Colombia where we went before, but there are no blood-dependent bats in China. ”

Su tina said this, Song Wenbin was not only not relieved, but even more scared, he asked fearfully: Then what are these people sacrificing, what sucked their blood out? ”

Su tina was stunned for a second, and hugged Song Wenbin again: "Don't say it, I'm going to be scared to death by you!" ”

Song Wenbin felt that he was going to be played, he wanted to hug but couldn't, and he couldn't push her away roughly, so he could only raise his hand and surrender.

"Alright, alright." Huo Yu was impatient: "We don't know what the purpose of this place is, and we can't believe all the words that the old man said, maybe this place is someone's hermitage, these cattle and sheep are eaten by people." ”

Sutina regained some of her senses and let go of Song Wenbin stupidly.

In order to hide his weakness, Song Wenbin hurriedly came to the side of the drone and asked the camera: "How is the signal over there, can you still receive the picture?" ”

After a long while, there was a hissing current sound on the walkie-talkie, "The signal is not very good, maybe you have to take the machine to shoot, and we can't control the drone if it's farther away." ”

The film crew's response was to be expected, this is not a civilized world, and it is impossible to have a signal tower. It's already a miracle to still receive a signal from such a distance.

For some reason, this isolation has given Song Wenbin some sense of security, and along the way, he has been under huge attention almost all the time, no matter where he is, people are tired of the teacher and the teacher is constantly shouting, which almost makes it difficult for him to breathe.

But underground, no one looks at him, no one pays attention to him, and no one knows him. Even the film crew became distant, and he felt a little lighter.

"We're going to keep digging down, it's pretty deep here, I'll take the camera down first." Song Wenbin said.

"When are you coming back?" Wei Ning's question came from the earphones.

"At the latest, it won't be at night."

Song Wenbin said.

After a brief communication with their colleagues, the three of them took their equipment and continued to explore the cave. Song Wenbin leaned against Huo Yu, he felt that his mouth should be useless in this kind of place, if there were really any monsters, he would have to look at Huo Yu.

Su tina also saw that this place was still useful, and she also snuggled up to Huo Yu's side, and the two of them stuck to her left and right, making Huo Yu roll his eyes and be annoyed.

The three of them walked along the tunnel, and soon saw some traces of human activity, the ground was full of grooves that had been cut out, and there were some stove-like things built up of dirt, one in the east and one in the west.

Song Wenbin's searchlight saw something at the edge of the cave, so he picked it up and saw that it was a broken piece of porcelain, the remains of a certain bowl, and the color of the suit was a bit similar to the fragments he fished out in the Nanyang Sea.

"What is this place?" Huo Yu asked, holding a searchlight.

"Obviously not, this used to be a boiling base." Sutina replied.

"Boiling, what's that for?" Huo Yu didn't understand.

"Nitrate is a component of black powder, whether it is war or civilian, it is an important industrial element, but nitrate has almost no natural mineralization, plus it is afraid of light, so it can only be in the shadows. In ancient times, boiling nitrate was a way for many people to make a fortune, especially in the soil of caves in the south, which is rich in nitrate, so many people would boil nitrate in caves. ”

Song Wenbin looked at the large and small potholes, and couldn't help but be dumbfounded, in this way, the plank road on the cliff can make sense.

Huo Yu looked disappointed and said, "So... It's still a business, the business of the ancients. Making up a horror story, or a story related to dragons, and transporting cattle and sheep to the cave, its real purpose is either to hide people's eyes or make people fearful, but in fact it is a cover for their own boiling career. ”

Sutina didn't answer.

Song Wenbin felt a little strange, Huo Yu reacted so quickly, he must have been deeply impressed by the restaurant owner's whole life. But why didn't Sutina immediately agree, wasn't she happy to see such a scientific statement?

"Is that so, Sutina?" He asked.

"Possibly." Sutina frowned, "It's very likely, but... It's not all..."

"Not all?" Song Wenbin was puzzled: "Do you think there is any possibility?" ”

Sutina still didn't speak.

Song Wenbin became more and more strange, this girl didn't reply to his question when she was in the riverside workshop before, why didn't she reply to him now.