The communication on the immortal path and the experience gained after the breakthrough can only temporarily affect the exploration and development of the lake.

When everything came to an end, Uchiha You continued to search deeper into the lake.

Fortunately, when Uchiha You broke through, wind-attributed natural energy exploded, affecting half of the lake. The source of natural energy they were looking for was within this range.

According to the location he felt on the day of the breakthrough, Uchiha You easily found the source of natural energy, which was a brand new crack hidden under layers of fallen rocks.

Judging from the surrounding terrain, the crack was formed during a landslide.

When the opposite mountain fell down and hit the bottom of the valley violently, huge vibrations spread from all directions of the impact point, focusing at the corner of the valley and tearing a crack in the thick rock layer.

Uchiha You also discovered that the peaks on both sides of the valley were all sedimentary rocks, but there were a large number of limestones distributed near the cracks, indicating that the cracks were very deep and penetrated into another rock layer.

Moreover, the crack is a spring of living water. The spring water rich in natural energy flows out continuously, bringing natural energy to the entire lake.

Uchiha You collected some spring water and brought it to shore to study with Miwa Masayo. They both smelled a faint fishy odor, proving that there was a lot of life at the source of the spring.

Uchiha You said confidently: "It should be connected to an underground river. There are many animals in this underground river. It is currently impossible to determine the specific source of natural energy."

"Unless we widen the crack and drill in to explore deeper."

Miwa Masayo shook his head like a rattle: "No, absolutely not, You, stop it!"

This time, Uchiha You did not insist, but nodded in agreement.

Exploring the underground river was too dangerous. Even if he solved the problem of breathing underwater, he would not be able to solve the problem of getting lost, which was a very deadly danger.

At the same time, underground rivers are different from normal rivers. The oxygen content in the river water is not stable, and even if you have mastered underwater breathing, your safety cannot be guaranteed.

After many underground rivers flow for a certain distance in the rock strata, the rock strata will absorb oxygen, causing a certain section of the water to become oxygen-free.

Once entering such waters, even fish will be suffocated to death, except for local specialized low-consumption species.

Uchiha You said: "If we can't explore deeper, there will be hidden dangers. The creatures in the underground river may enter the lake, which may bring danger to us and the ninja cats."

Miwa Masayo frowned and said, "That is the source of natural energy. It certainly cannot be blocked, but it can be blocked into very small holes. At least it can prevent large creatures from invading."

"Good idea! Block most of the cracks, and then set up multiple layers of traps. Use traps that allow entry but no exit to block and capture any underground river creatures that may appear."

"Not only can this prevent the invasion of underground species, but it can also help us gain some intelligence about underground rivers by studying the captured animals."

The most important source of natural energy has been identified, and the subsequent work plan has been determined. The remaining work can be handed over to the Cat Castle.

Uchiha Yuu and Miwa Masaya continued to communicate and practice attentively while monitoring the changes in the cracks and lakes.

Even though the breakthrough situations have been exchanged, the communication between the two psychic contractors is still very important.

They are all immortals, but they have taken different immortal paths.

Uchiha You relied on the settings of his previous life's novels, the theories of Taoist philosophy, the chakra theory of the ninja world, and his own random thoughts, and after mixing them together, he relied on absolute luck to carve out a path.

After his sudden realization, he has clearly abandoned the system of cultivation novels, and deduced his own method of cultivation in the foundation-building period. However, there are still countless problems in the specific practice that need to be tried and solved, and he relies very much on communicating with his fellow Taoists to stimulate his inspiration.

Miwa Masayo has been with Uchiha Yu for three years, and has unknowingly accepted Taoist philosophical thoughts. Combined with what he heard about the immortal arts of the three holy places, he has his own unique understanding of the immortal way.

It was because of the thoughts about the way to immortality in his heart that when Uchiha Yu was building his foundation, Miwa Masayo was able to feel the turmoil of natural energy and took the opportunity to become the first cat immortal.

The paths of both immortals are based on the five divisions of natural energy, and both start from the natural energy of fire. Their starting points are very similar.

But their understanding of the way of immortality is not consistent.

Uchiha You takes pure natural energy as the foundation, compatible with the chakra ninjutsu system, and embarks on the path of pursuing the five elements. The powerful and complex power, the restless and balanced mind, enable him to purify the Uchiha family bloodline, tap the potential deep in the bloodline, and derive incredible magical powers.

Miwa Masayo combined fire-type natural energy with fire escape chakra to generate fire-type fairy chakra. Perhaps because it was too pure and rejected other natural energies, the tabby cat embarked on the path of pursuing purity and dug deep into the rules of the fire system.

As the pioneers of their own paths, the two of them had no reference to the traditional ninja sages, so they were very dependent on each other and needed each other's progress to verify whether their own paths were correct.

Uchiha You had an epiphany when he broke through and deduced a decisive result, which was extremely good news for Miwa Masayo. She needed to refer to her owner's knowledge and correct her direction.

Discussion and debate are the main activities they spend time together.

On the morning of the fourth day of waiting for Maoyou, the man and the cat were arguing about the techniques of using the natural energy of fire. When they were arguing, they suddenly made surprised sounds at the same time.

Miwa Masayo asked in confusion: "Is it a ninja?"

Uchiha You confirmed: "Yes, they are ninjas, and there are no less than four of them."

Uchiha You quickly frowned and said, "The four of them are full of murderous intent. They are not here for good. As usual, I will block the front and you will support from the outside."

The tabby cat nodded, performed a fire jump, and disappeared into the flames.

Uchiha You waved his hand and created a gust of wind, which eliminated all traces of his companions on the ground and blew away the scent she left in the air.

After making sure the smell had completely dissipated, he began to pack his bags, pretending to be leaving.

A few minutes later, three ninjas appeared from the hillsides on both sides of the valley and the river in the south, and they surrounded Uchiha You invisibly.

Uchiha You reacted immediately, he dropped his bag and drew out his straight sword to be on guard.

The Sunagakure ninja who was climbing up the dam quickly was the fastest. He quickly approached and stopped at the edge of the shuriken's range.

After carefully observing Uchiha You's appearance, he shouted, "Konoha Ninja, what are you doing here?"

According to the rules of encounters between ninjas, Uchiha You responded in the strongest tone: "I am a Konoha ninja, this is the Land of Rivers, a Sand Village ninja, according to the rules you have no right to ask me for information."

The Sand Village ninja on the left hillside quickly went down the mountain and also stopped at the edge of the shuriken's range.

He mocked loudly, "According to the rules? The underground ninjas of Konoha are so naive. You should know that all the rules are a reflection of strength. Now we have three companions. You have no right to refuse our inquiries."

"Otherwise, we will have no choice but to arrest you and then interrogate you slowly."

Uchiha Yubai started the battle and said coldly: "You can try."