"Don't you think it's meaningless?" Huo Yu was seriously surprised by Su Tina's change of words.

"What if, what if I find some new species for you? I don't want my name not to be on it when future generations of historians write this." Sutina said with extreme reluctance.

"Yo? Are you letting go?"

Huo Yu was happy: "Do you think there is a dragon?"

"There is no dragon! But there may be a strange salamander, an amphibian, living down here." Sutina said.

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

"I tell you, you don't understand either." Sutina sneered.

Song Wenbin felt guilty for some reason, which made him angry. He obviously didn't really agree to Su Tina, so why should he feel guilty. As an amphibian, don’t look for such outrageous excuses, okay?

"Just go down, I won't let you go down." Song Wenbin said nonchalantly.

"Humph." Sutina pouted, unhappy.

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

It has to be said that the hard work 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 made Song Wenbin feel that rock climbing is almost as simple as pediatrics.

Soon, the three people who completed the training returned to the Black Dragon Cave with all the equipment. Different from the previous resistance, Su Tina was eager to try it out, urging Song Wenbin and Huo Yu all the way.

Song Wenbin groaned as he dug the rope nails for descent into the rock wall, thinking that he might be crazy.

After fixing one end of the main rope at the top of the cliff, Huo Yu volunteered to fasten a safety belt around his waist and hang an iron lock in front of his abdomen. Then the main rope was wrapped around the descender in an "eight" shape, and then the descender and the iron lock were Connect, the upper end of the main rope in your left hand, and hold the main rope that comes out of the descender with your right hand behind your hip. Facing the rock wall, spread your legs at an angle of about 80 degrees, climb onto the edge of the cliff, and start descending first.

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

It is quiet inside the cave. The cliff faces downwards at 70 or 80 degrees. There are many traces of water erosion on its surface, but it feels very dry. It must be due to the change in water level that it has not been moisturized for a long time. However, there are still some small potholes, which are traces of artificial excavations and their purpose is unknown.

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

The two people above the cave looked down. Under the illumination of the overhead searchlights, they actually saw a long strip of bulge winding downwards on the edge of the dark cliff.

This made Song Wenbin's heart skip a beat. Could it be that there is really an undiscovered super species in this world? ? ? How lucky were they to find out so easily? ? ?

But soon, he discovered that this was just 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 twists and turns downwards. The plank road is in a state of decay. Judging from the source, it should be extending from the entrance of the cave. However, it has been too long, and the plank road at the entrance of the cave has rotted away. There are still some left below.

"Why is the plank road built here?"

Song Wenbin hung in the air, puzzled.

"I don't know." Huo Yu buttoned the wood on the plank road, and it broke into pieces.

"Maybe it's to avoid the war, maybe to boil saltwater, or maybe to live in seclusion, who knows, just go down and take a look and you will know." Sutina said faintly excited.

"You're in high spirits, aren't you." While descending, Song Wenbin couldn't help but say something to Su Tina.

"That's not it, a great underground adventure on an extraordinary journey." Sutina said with a smile.

"Ha, woman, changing your face is like turning the page in a book. Yeah, yeah, I don't want to waste my time on meaningless things." He imitated the words while holding his throat.

Su Tina above her head swung her leg and kicked him, but Song Wenbin grabbed her ankle. She giggled, and her laughter echoed in the dark underground cave, becoming extremely scary.

"Don't make trouble, it's dangerous!"

Huo Yu below scolded.

The two stopped fighting and descended along the rope honestly.

The plank road on the rock wall disappears and appears. From time to time, you can see a few pieces of wood. In some places, you can even see holes drilled into the rock wall. In addition to the rotten wood, there are also some rusty ones. A small iron cage. When Song Wenbin passed by a wooden frame, he couldn't help but pick it up and look at it. Su Tina next to him came over to look at it and said, "This is a torch."

Torches…..

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

Song Wenbin couldn't help but think of how many years ago, the fire was flickering on the cave wall, and someone was carefully walking down from above, holding a torch, along the plank road.

They have descended nearly a hundred meters now. Being able to dig a tunnel on a cliff hundreds of meters deep was still in ancient times with backward technology. God knows how much manpower and material resources it would cost.

What are they doing? Why go underground?

Song Wenbin could not 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 it felt like she was going home. In the blink of an eye, she left Song Wenbin and Sutina behind.

"Slow down!" Song Wenbin couldn't help but blame him: "You're in a hurry to reincarnate!"

After that, he called to Sutina, stepped on the rock wall, and descended all the way. Half an hour later, Huo Yu's voice came from the bottom, "I'm here!"

Song Wenbin speeded up, and soon, he and Su Tina stepped on solid ground. Compared with the narrowness of the cave when they first entered it, it was a lot more spacious. The ground was full of collapsed gravel, and there were some towering towers. of stone pillars. The cave is still extending downwards, with no end in sight, but the slope has become much gentler.

Song Wenbin was watching.

Yeah! !!

Without warning, Sutina suddenly turned around and hugged him.

The charming fragrance of hair rushed into Song Wenbin's nostrils, coupled with his soft body, causing him to have a physiological reaction almost immediately.

Song Wenbin subconsciously hugged Sutina, but he quickly realized that she was filming a show. Where could such an intimate gesture be done? He quickly pushed Sutina away and said helplessly: "What are you doing!"

"Bone...bone...there are bones..."

Sutina shrank her arms and said tremblingly.

The gun he just raised was quickly suppressed. Song Wenbin was startled and turned around to look. With the bright light of the flashlight, he saw a lot of skeletons on the ground. At this glance, he also shrank and almost went back to hug Sutina. I don't know how many years ago these bones were left, and some of them have been deeply embedded in the collapsed gravel on the ground. Almost blending in with them.

Huo Yu was so courageous that she squatted down and turned over the bones. Soon, she stood up a little disappointed, clapped her hands and said, "They are animal bones."

Song Wenbin breathed a sigh of relief.

"What kind of expression do you have!" Sutina yelled, "Animal bones are also scary, right?"

"Could it be a dragon bone?"

Song Wenbin babbled nonsense and said that he saw a bone with horns on it.

Huo Yu picked up a skull, looked at it for a moment and couldn't see anything, then threw it to Sutina. Sutina dodged it like a bomb and shouted: "I'm sick!!"

"Look in the encyclopedia and look at the bones." Huo Yu said.

"Don't you recognize this horn? It's a buffalo!"

Sutina kept complaining: "Please don't throw things away. I'm very timid and don't care about others."

Huo Yu touched his chin and thought: "It seems that the old master didn't lie to us. Someone has made sacrifices here."

"Are they those cattle and sheep whose blood has been sucked dry?" Song Wenbin knelt down to look at the skull.

"It should be." Huo Yu replied.

"Will there be bats?"

Song Wenbin curled his neck and asked, looking around for fear that a swarm of bats would fly out of the dark cave and suck him dry.

"That's not necessarily the case."

Seeing that Song Wenbin was scared, Sutina immediately switched back to the encyclopedia from the Resentful Woman. She raised a finger and pretended to be: "Actually, vampire bats account for a very small proportion of all bat species, and the vast majority of bats are still considered wild. They live on fruits and insects. Looking at the whole world, blood-sucking bats only exist in the Americas. There are some in Mexico and Colombia where we went before, but there are no bats that rely on blood for a living in China."

When Su Tina said this, Song Wenbin not only felt uneasy, but even more frightened. He asked in fear: What are these people sacrificing? What sucked their blood? "

Su Tina was stunned for a second, and hugged Song Wenbin again with a cry: "Stop talking, I will be scared to death by you!!"

Song Wenbin felt that he was being played badly. He wanted to hug her but couldn't, and couldn't push her away roughly. He could only raise his hands in surrender.

"Okay, okay." Huo Yu said impatiently: "We still don't know what the purpose of this place is, and we can't believe everything the old man said. Maybe this place is someone's retreat, and these cattle and sheep are eaten by people. Dropped."

Su Tina regained some sense and let go of Song Wenbin angrily.

In order to cover up his guilty conscience, Song Wenbin quickly came to the drone and asked the camera: "How is the signal there? Can you still receive the picture?"

After a while, the hissing sound of electricity came from the intercom, "The signal is not very good. Maybe you have to bring a machine to take pictures. If it is further away, we will not be able to control the drone."

The response from the film crew was expected. This is not a civilized world, let alone a signal tower. It's a miracle that we can still receive signals from such a distance.

For some reason, this kind of isolation gave Song Wenbin some sense of security. Along the way, he was under huge attention almost all the time. No matter where he was, people kept calling him "Teacher" and "Teacher", which almost made him It's hard to breathe.

But underground, no one is looking at him, no one pays attention to him, and no one knows him. Even the camera crew became distant, and he felt slightly relieved.

"We still need to continue exploring. It's quite deep here. I'll take down the camera first." Song Wenbin said.

"When will you come back?" Weining's question came from the earphone.

"No later than night."

Song Wenbin said.

After a brief communication with their colleagues, the three took their equipment and continued to explore the cave. Song Wenbin leaned next to Huo Yu. He felt that his mouth would be of no use in a place like this. If there were any monsters, he would have to look at Huo Yu.

Sutina also saw that her fists were still useful here, and snuggled closer to Huo Yu. The two of them pressed against her, one on the left and the other on the right, which made Huo Yu roll his eyes in annoyance.

The three of them walked along the cave and soon saw some traces of human activities. There were grooves dug out everywhere on the ground, and there were some stove-like things built up by the soil, one here and one here. one.

Song Wenbin's searchlight saw something near the cave, so he picked it up and took a look. It turned out to be a broken piece of porcelain, the remains of a certain bowl. Judging from the pattern and color, it looked a bit like the piece he fished out from the Nanyang Sea. .

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

"It's obvious, isn't it? This used to be a saltpeter boiling base." Sutina replied.

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

"Nitre is a component of black gunpowder. It is an important industrial element in both war and civilian use. However, there is almost no natural mineralization of nitrate, and it is afraid of light, so it can only be used in the dark. In ancient times, there was a lot of boiling of nitrate. The way for people to get rich, especially in caves in the south, is that the soil is rich in nitrate, so many people boil nitrate in caves.”

Song Wenbin couldn't help but feel dumbfounded when he looked at the large and small potholes. Putting it this way, the lengthy plank road on the cliff made sense.

Huo Yu looked disappointed and said: "So... this is still a business, the business of the ancients. Make up a horror story, or a story related to dragons, and transport cattle and sheep to the cave. The real purpose is to deceive others. Or it may make people awe, but in fact it is a cover for one’s own business of boiling salt.”

Sutina didn't answer.

Song Wenbin felt a little strange. Huo Yu reacted so quickly. He must have been deeply impressed by the hotel owner's treatment of Long Yin. But why didn't Sutina agree immediately? Wasn't she happy with such a scientific statement?

"Is that so, Sutina?" he asked.

"It's possible." Sutina frowned and said, "It's very possible, but... not all..."

"Not all?" Song Wenbin was puzzled: "Do you think there are any other possibilities?"

Sutina still didn't speak.

Song Wenbin became more and more curious. This girl didn't reply to his questions when they were in the riverside workshop, so why didn't she reply to him now.


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