Yu Baiying also came over and carefully observed the cave. He found that it was about one meter in size, and there was a row of stone steps at the entrance.
Some messy footprints were found on the edge of the cave, which were obviously often seen.
So Yu Baiying turned around and checked the soles of the killed ninjas, which just matched the footprints of the ground hole.
"This cave should be the secret passage for those ninjas."
Yu Baiying came to this conclusion, and then said to Su Yuan: "If I go on rashly, I'm worried that there will be ambush inside!"
Upon hearing this, Su Yuan immediately used his divine thoughts to investigate the cave...
Although Su Yuan's "Sky Eye Power" was inexplicably disturbed and could not be used for the time being, his divine consciousness was still strong and could detect situations within a certain range, or even crises.
"There is no ambush in this cave for the time being. Let's go down and take a look right away! Maybe we have the chance to find the ninja's nest, and we also have to find Xiaoling's whereabouts and rescue her!"
Su Yuan said this to Yu Baiying.
"good!"
Yu Baiying immediately agreed. Because Lan Qingling was captured, she felt quite guilty in her heart and wanted to find her whereabouts and rescue her.
Then, Su Yuan and Yu Baiying walked down the stone steps of the cave.
The stone steps were not very deep, about ten meters away. After the two of them walked under the stone steps, they found that there was a rather spacious tunnel.
Moreover, there are wall lights on both sides of the tunnel, extending forward, and I don’t know where it leads.
While Su Yuan used his divine thoughts to investigate the tunnel, he moved forward step by step with Yu Baiying.
After walking for at least twenty minutes, the two of them walked out of the tunnel. Strangely, the road was unobstructed and they did not encounter any mechanism or ambush.
Outside the tunnel, there was a deep valley with an inverted funnel-shaped shape, narrow at the top and wide at the bottom, surrounded by tall and steep mountain walls, and covered by dense vines and trees.
If Su Yuan and Yu Baiying hadn't walked here along the tunnel, they would have been hard for them to find such a hidden place.
"There is a door there. Should we go in and take a look?"
Yu Baiying suddenly pointed to the diagonal opposite of the valley, and a stone gate actually appeared there.
"Don't go there first, there may be ambush in this valley!"
Su Yuan said this to Yu Baiying.
As soon as he finished speaking, he felt something moving above his head.
Su Yuan looked up and saw four black-clothed ninjas, holding on to the vines and swinging down like ghosts.
The four black-clothed ninjas were as quick as monkeys. They grabbed the vines and swung in the air for a few times before they landed on the ground one after another, then quickly dispersed, surrounding Su Yuan and Yu Baiying.
Strangely, the four ninjas were holding a strange-shaped gun in their hands.
The gun looked like a loudspeaker with a metal tube, but he didn't see the magazine.
The four ninjas holding strange guns stood in a fan shape opposite Su Yuan and Yu Baiying, and raised their guns and pointed them at them.
"This is a special electronic net capture gun, which contains a metal net made of special alloys. Once it is entangled, it is difficult to break free. Xiaoling was caught by this kind of gun! We must be careful!"
Yu Baiying recognized this gun and immediately reminded Su Yuandao.
Puff! Puff! Puff! Puff! Puff!
As soon as the words were finished, the four ninjas holding electronic net traps pulled the trigger almost at the same time.
Suddenly, four metal mesh with blue light flashed out of the muzzle, quickly spread out in the air, and then whistled towards Su Yuan and Yu Baiying.
With Yu Baiying's reminder, Su Yuan was not panicked, but waved his hands, and an instantly powerful gust of wind came out, instantly shaking away the four metal mesh roaring.
Su Yuan didn't stop, and moved his body and rushed towards the four ninjas who fired electronic net capture guns.
Seeing that the situation was not good, the four ninjas quickly retreated.
Su Yuan didn't let them escape. He suddenly accelerated his feet, then leaned over and grabbed a metal net that fell to the ground, and threw it directly at them.
Su Yuan's method of casting the net was fast and accurate, and he immediately blocked the four retreating ninjas.
The four ninjas who were trapped in the net suddenly screamed and spoke Japanese.
Although Su Yuan couldn't understand Japanese language, he also knew that the ninjas should be calling for reinforcements.
Sure enough, with the call of the four ninjas, an abnormal movement appeared on the opposite side, and a disc-shaped aircraft flew out of the stone gate.
The disc-shaped aircraft looked like the legendary flying saucer, but it was only the size of a sea bowl, with a silver-gray metallic luster all over it, which should be its coating.
At the top of the disc-shaped aircraft, there is a circle of small holes that flash with blue light.
This thing was very fast. It flew from the direction of the stone gate to the sky above Su Yuan and Yu Baiying's heads, about four or five meters high, hovering and making a strange buzzing sound, the sound was like an extra-large bee.
Amid the buzzing sound of the disc-shaped aircraft, Su Yuan suddenly felt a vibrating in his brain, and there was a dizziness and even nausea in front of him...
Yu Baiying was even more unbearable. She covered her head with her hands and fell to the ground, looking very painful, but she still gritted her teeth and reminded Su Yuan: "Be careful, this... this is an infrasonic aircraft, which can release infrasonic waves that are enough to make people die...
”
The sound that humans can hear is sound waves in the frequency range of 20-20000hz, while those below 20hz are infrasound waves.
Since the oscillation frequency of infrasound waves is similar to that of people's brain rhythm or is equivalent to that of human internal organs, the internal organs will have strong resonance and strongly stimulate the human brain. At the least, there will be panic, crazy and restlessness, and at the worst, there will be shortness.
I fainted and even completely lost my self-control during time, and even died.
Moreover, infrasonic waves cannot be heard by humans, so they are difficult to detect, and can even penetrate walls and other objects to attack hidden targets.
Moreover, the power of infrasonic waves is very powerful and can cause serious damage to the target.
According to this principle, the infrasonic weapons studied can have serious impacts on the human brain and nervous system. In mild cases, muscle spasms, whole body trembles, and difficulty breathing; in severe cases, blood vessels rupture, organ deformation, displacement, and even rapid
die.
Yu Bai recognized that the disc-shaped aircraft in front of him was a very advanced infrasonic weapon.
"Infrasonic aircraft!"
Su Yuan's face shook when he heard this. No wonder he had such a high cultivation level and almost couldn't resist it. It turned out that this thing was difficult to defend against, and the enemy actually had such advanced infrasonic weapons!
"Hurry and find a way to destroy this statue, otherwise we all have to..."
Yu Baiying said this to Su Yuan, but before she finished speaking, she couldn't bear it and fell to the ground and fainted.