Infrasonic Radar

After eating his fill, Umino Sasuke found an excuse and returned to the underground laboratory.

Fortunately, Aburame Shibi was sensible, or his reconnaissance range was limited. He only distributed the Kikaichū to the periphery of the defense zone and didn't intend to monitor the four of them. Otherwise, it would have been difficult for him to get away.

Upon arriving at the underground laboratory, Umino Sasuke couldn't wait to unseal the Sealing Scrolls and begin installing the experimental equipment.

This experimental equipment was quite valuable. He took the time to spend two days installing it all.

Once the laboratory was set up, he immediately took the Summoning Beast, Water Bat, which had been cut in half, out of the saline bottle for dissection and research.

The research results were promising, yet not entirely smooth.

The good news was that through these few days of dissection and research, the ultrasonic principle of the Water Bat had been largely deciphered.

The bad news was that while Chakra was versatile, it also followed the law of conservation of energy. To achieve the same level of meticulous detail as the Water Bat's physiology required a significant amount of Chakra and control.

Once the detection range exceeded the three-kilometer limit, the requirements for Chakra amount and control would increase geometrically.

Under normal circumstances, such as in actual combat, to maintain constant control of the battle rhythm like the Byakugan, the detection range of the Sonic Radar Technique should ideally be kept below two hundred meters.

Of course, with further research, the detection range of the Sonic Radar Technique could be expanded with the same amount of Chakra consumption. However, the further along he got, the harder it would be to improve, unless there was a breakthrough in Chakra control or the Transformation Jutsu.

"Continuing research in this direction is becoming a losing proposition."

Umino Sasuke was somewhat disappointed. The path of further increasing the detection range of the Sonic Radar Technique, while not a dead end, clearly had a disproportionate ratio of investment to return.

However, just when he thought all was lost, a new opportunity emerged.

As he wanted to explore related fields and read some research materials on Summoning Beasts, he discovered some interesting research data.

Especially some related research on Tiger Summoning Beasts.

Tiger Summoning Beasts generally possessed extremely high combat power, almost on par with flying-type Summoning Beasts like eagles and falcons, making them essential research projects for major organizations.

These organizations focused on researching the composition of the combat power of Tiger Summoning Beasts. He, however, inadvertently stumbled upon a less conspicuous research document, or more accurately, an observational record that deviated from the mainstream research direction.

According to this observation record, the Tiger's Roar of Tiger Summoning Beasts actually possessed a deterrent effect similar to genjutsu, with an extremely wide range of influence. A single roar could travel for dozens of miles and even cause ordinary creatures' hearts to stop.

"In other words, the Tiger's Roar of Tiger Summoning Beasts has extremely strong penetration and can propagate over a great distance."

Umino Sasuke was greatly shocked and immediately realized the value of this research material.

Knowledge he had seen in popular science books in his previous life also began to surface in his mind.

According to the popular science books of his previous life, the frequency range humans could hear was between 20 and 20,000 Hertz.

Sound waves with frequencies below 20 Hertz are infrasound; sound waves with frequencies above 20,000 Hertz are ultrasound.

The Tiger's Roar was infrasound.

Its sound wave frequency was concentrated between 14-18 Hertz, falling precisely within the infrasound frequency range.

Infrasound has extremely strong penetration and can propagate over long distances.

The so-called "tigers roar in the mountains" refers to how a tiger's roar can shake several mountain peaks, demonstrating the terrifying propagation distance of its roar.

Furthermore, research indicates that Tiger's Roar sound waves can penetrate the human skull and the brain's alpha waves, causing resonance and inducing electric shock-like illusions and nerve paralysis in humans.

Even the powerful penetration of Tiger's Roar sound waves could affect the physiological responses of surrounding small animals, causing their hearts to stop.

At the same time, tigers can also sense pre-earthquake signs through infrasound, reacting and warning in advance.

"The tiger's roar is actually infrasound!"

Umino Sasuke was greatly shaken, and his heart burned with excitement.

In the Ninja World, Tiger Summoning Beasts, influenced by Chakra, had their abilities greatly enhanced in all aspects, and the infrasound in their roars was no exception.

Now it seemed that the deterrent effect of Tiger Summoning Beasts, which was similar to genjutsu, was likely due to the infrasound in their roars being amplified by Chakra, making the effect even more terrifying.

Umino Sasuke compared the experimental data and conducted further research, finding that his hypothesis was correct.

"Fortunately, I have prior experience developing the Water Bat's ultrasound. Otherwise, I would truly be bankrupt this time."

Tiger Summoning Beasts were generally strong in combat, and there were many organizations researching this area, leading to high demand and consequently high prices. Moreover, this was the front line, so acquiring a Tiger Summoning Beast would incur a significant premium.

Now, with the experience from developing the Water Bat's ultrasound and the relevant research materials in hand, he had saved himself a lot of trouble.

Having discovered such a promising new research direction, Umino Sasuke naturally became engrossed in it.

For a long time afterward, whenever he had free time, he would head to the underground laboratory. Fortunately, some of the materials could be stored in Sealing Scrolls, allowing him to slowly flip through them while on patrol.

"That's enough research for today."

Umino Sasuke stretched, saved all of the day's research results, and then rushed back to the sentry patrol post.

It took him about ten minutes to finally return to the sentry patrol post.

"Captain, you didn't go off to the military post exchange for some fun again, did you?"

Tejudo walked over with a lecherous grin and sniffed Umino Sasuke all over, only to detect the smell of disinfectant.

Umino Sasuke took out a small bottle of Water Bat No. 6, tossed it over, and reprimanded him irritably, "If you want these little cuties in the future, then shut your mouth."

"Alright, I'll shut up, right away."

Tejudo caressed the bottle of poison in his hand, cherishing it as if it contained his beloved wife rather than poison.

As Umino Sasuke returned, Inuzuka Ryo and Xiao Xiao, familiar with the routine, immediately began setting up to cook.

Umino Sasuke continued to be responsible for fishing. With his exhaustive fishing method, only he could catch Golden Mandarin Fish now.

Meanwhile, Tejudo carried a large wooden bucket and practiced treading water on the river's surface downstream.

"Infrasonic Radar Technique."

Umino Sasuke stood on the river's surface, formed an Ox seal with his hands, and began to sense.

Soon, he detected several Golden Mandarin Fish hidden in a deep pool to his right.

"Quake!"

Umino Sasuke brought his Ox seals together. A completely invisible infrasound wave silently impacted the deep pool.

A few seconds later.

A large number of stunned freshwater fish floated to the surface of the river, including several Golden Mandarin Fish.