Weak air currents enter and exit in the nine holes, and the sound waves flow slowly like water ripples, and a trace of light sound floats in the corridor at a frequency that is imperceptible to the human ear.

The restless ant colony froze for a while, as if listening carefully to identify, the tentacles at the front of the head trembled slightly, and there was a puzzled look.

It seems to be checking whether this note has been heard in the depths of memory, and what kind of command the frequency band represents.

Ning Yun's palms clenched, and he pinched out a handful of cold sweat, what if this Gu worm with a low IQ couldn't understand?

The atmosphere in the corridor was stagnant, and the face inside the man's black robe was grim, always paying attention to the ant colony's every move.

After wandering and hesitating for a long time, the ant colony seemed to understand the command of the flute, and a group of ants in the rear team began to show signs of turning around.

As the first wave of ants turned away, the colony in front of them began to turn around.

Ning Yun suddenly breathed a sigh of relief, it seemed that this ancient Gu control instruction condensed in the memory of the Red Bull Dog Ant was deeply rooted and still deeply remembered to this day.

July's expression was extremely focused, with a tight and loose finger movement, and the opening and closing of the air holes indicating that she was still playing.

The ant colony retreated like a tide, burrowing densely into the cracks, coming and going.

After about 20 minutes, the ant colony was no longer visible in the dark cracks, and the road surface returned to its previous tranquility.

"Whew!" July frowned, his heart was haggard, and he breathed lightly, and the jade flute left his lips and teeth slightly. The playing of the seven rhythms consumes mental and physical strength, and requires a high degree of mental concentration in the process, and she gradually seems to be overwhelmed. But the ant colony was finally able to retreat safely.

"Great, the girl is amazing." Ning Yun had a happy expression, and raised his eyebrows at the black-robed man, knowing that his girl could control this group of Gu worms, otherwise how could she become the youngest great witch in the history of Miao Jiang.

The black-robed man also reflected at this time, the flute sound played in July is a silent frequency band, and the design of the jade flute itself is used to control Gu, and the excavation of the nine holes may be specially designed for this special frequency band sound.

His awareness and attention to July has undoubtedly risen to another level, and his tone of voice has become extremely humble, "At a young age, I have this ability, it seems that I am really old." He thought to himself how far he could have gone without the woman in front of him. Maybe he may not even be able to see the gate of the ancient city buried in the sand, which also strengthens his determination to follow Qiyue.

"Can we go now?" The black-robed man asked, among the three at present, July's opinion is undoubtedly the most authoritative.

"Nope." In July, it was immediately stopped, "the road to the front has been sealed." Slender Jade pointed to the end of the dark corridor at the front of it, and shook her head.

"Why?" The black-robed man looked at the road ahead in boundless darkness, but he couldn't see if there was danger, and how she confirmed it.

"A feeling." July held the jade flute in her right hand, and caressed it with pity in her left hand, and the special feeling of a woman at the level of the Great Witch told her that she needed to continue to wait at this time.

"Boom~" The violent shaking sound of the ground shaking the mountains reappeared, and the corridor fell into chaos again, I really don't know what kind of situation will appear next, and what kind of dangerous place it will fall into.

The black-robed man had become a frightened bird, holding a wall with one hand, stabilizing his swaying figure.

July's approach surprised him even more, only to see July standing in place, his light and fluttering body was as soft as a boneless, and his strange figure changed the angle and orientation of his body with the shaking of the earthquake ripples, and he never fell.

The shaking of the tunnel caused by the earthquake became more and more intense with the roar, and the friction sound brought by the rotation of a group of gears stimulated the nerves of the three people like grinding teeth, and the sound was extremely harsh and heart-stopping.

The three of them almost all had a conditioned reflex, and they were all worried when they heard the sound of the gears running in the wall.

"Stay close to the wall and keep a distance of about one metre against the wall." Rich experience has taught me that in the corridors full of organs, unknown dangers may come from all directions, and in this case, it is safest to get close to the wall. At the same time, you should also keep a certain distance from the wall, concentrate your whole body, and be cautious of the hidden repeater machine in the wall.

There is no better way to dodge, and under the intertwined strata, only extraordinary skill and quick reflexes are the only key to survival.

In this regard, Qiyue and Ning Yun had no experience to follow, so in a panic, they had to obey the black-robed man's orders and stand against the wall.

The earthquake lasted for more than a minute, and the black-robed man's face became more and more solemn, and it would take such a long time to gather momentum, and the mechanism attracted must be extremely powerful.

Inside the wall, the sound of the run-in gradually eased. But he didn't dare to slack off in the slightest, "Attention, at this time, the mechanism may be triggered at any node." This does not mean that the danger is over, on the contrary, the momentum is completed, and the mechanism is ready to work at any time, and he does not think that the mechanism of a thousand years ago has decayed and is ineffective with the passage of time. The ancients were far more clever in their number of tricks, and they could make a corpse that would not rot for thousands of years, not to mention a bunch of gear traps.

"It's okay." Ning Yun leaned on the wall to observe left and right, and saw that there had been no movement, and his nerves became bigger.

"Ahh A bright light suddenly shot out from the crack, which really scared her.

The sound of gears suddenly appeared from within the crack, as if something was climbing up under the crack, Ning Yun poked his head out and glanced at it, "It won't be Brother Ant who will go and return." ”

As time passed, a thick and bulky gate was pushed out of the crack, and little by little it climbed along the crack to the ground corridor. At the same time, streaks of black, viscous liquid overflowed the edges of the cracks, and the smell was pungent and fishy.

Ning Yun looked frightened, and covered his mouth and nose disgustingly, "What's it, it's so disgusting." The lingering smell made her sick.

The tip of the black-robed man's nose twitched, and he sniffed the smell: "It's like the rotten smell of insects." ”

The smell entered his nose, and July glanced at it, smelled the smell, and said firmly and regretfully: "It's the previous Red Bulldog ant." ”

Well? Hearing this, both of them had expressions of disbelief, were they all dead? How could this be, Ning Yun wondered, "How could these Gu worms all die here?" ”

The huge gate with vertical cracks protrudes about 30 centimeters from the ground of the road, and the height is still rising, and it looks like it is about to completely cover the road in front of the road. And the back of the corridor where the three of them were located was completely a sealed wall.

The two closed together to form an enclosed space, trapping the three of them in the middle corridor.

A figure flashed by, approaching the Yongdao raised by the giant gate very quickly, and July reacted more quickly, reaching out to stop him, seemingly inadvertently making a gesture, and dragged the black-robed man back, "Don't worry, the road ahead is sealed, and it won't help if you pass." ”

When he looked again, the giant gate was already close to the top of the corridor, and the remaining opening of less than twenty centimeters had to be avoided, and it was impossible to pass through again.

"Did you see these Red Bulldog ant carcasses and know why they all died?" July reassured each other.

"How do I know?" He seemed impatient, how did he understand the habits of Gu worms, and he was not accompanied by insects all day long.

"Ever heard of biological braking?" A light full of wisdom flashed away, and July looked at him with a slight smile.

Biobraking? There is no bioenergy drive in today's technology, after all, mainstream scientific and technological progress has been large-scale adoption of machinery, but bioenergy formulation is still understood, and the traditional donkey grinding is a way for ancient people to use biological labor. However, July was not referring to this simple use of biological forces, and he gradually settled down, intending to hear July's explanation. Anyway, even if you hit your head now, you can't break the door across the corridor.

July noticed that his chaotic and restless aura had calmed down a lot, and then slowly explained, "In ancient times when there was no modern technology, the most frequent use by the ancestors was bioenergy braking. Ordinary people use livestock power the most, while clever Gu masters will use more Gu worms to drive the machine. ”

Mechanical braking is the best braking method, but it is subject to the effects of mechanical materials and time environment, and often wears out and stops acting for various reasons over time. Biodrives, on the other hand, are inexhaustible energy sources that can be used to run non-stop as long as a circular biological chain is formed in the tunnel.

"You mean, this door is driven by a litter of red bulldog ants?" It was difficult to accept this kind of cognition for a while, and he couldn't accept it anyway, this giant gate weighing more than 1,000 tons was actually controlled and opened by a group of small insects.

"Well, typical biodrive. There are caves underneath the cracks, forming a complete food chain, otherwise they would not survive. July didn't seem to be worried about the current situation at all, and her composure invisibly reassured the two.

The giant door was completely closed, and it was embedded in the wall at the top of the corridor with a "boom", interrupting the conversation between the two abruptly, and the space was silent and dark.

The sound of three breaths came and went, and they could only feel each other's existence, as well as the smell of rancid Gu worms.

"The ancient craftsmanship is really amazing, how many Gu worms need to die to open and close the door once?" The black-robed man secretly felt sorry for them, it was more difficult to breed this kind of red bulldog ant in modern times than to ascend to the sky, let alone maintain their ancient ferocity.

"Boom~~~" After a long time, the piercing tremor sound came from the direction where the door was located, along the four walls of the door frame, revealing a faint light.

"What's the fuss again?" Ningyun hugged July tightly.

July's face was as usual, and he couldn't see his joy or anger, as if everything was under control, waiting for the change of the giant gate.

"Dumen's last change." After crossing the Red Bulldog Ant Pass, all the layout of Dumen should be over, and July is waiting.