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The ultra-deep zone is the deepest part of the ocean's vertical stratification, mainly distributed in the interior of trenches and fault canyons.

This place possesses overwhelming extreme pressure, water temperatures that are infinitely close to freezing, and perpetual darkness.

It is arguably the most terrifying area on Earth.

At this depth, the physical properties of seawater change again.

Under ultra-high pressure exceeding 600 atmospheres, the gaps between water molecules are compressed to the extreme.

The seawater, which was originally very fluid, now felt like thick glue to the touch.

At the same time, buoyancy also increases exponentially.

Fang Cheng could clearly feel that his falling speed began to slow down uncontrollably.

The surrounding seawater had become too "hard".

Every swing of the arm felt like cutting through thick cowhide with a blunt instrument, the resistance was beyond imagination.

Moreover, air and sound seem to have lost their medium of transmission here.

The golden flames emanating from the Primordial True Domain shone on the thick water, even refracting it to a crystal-like texture.

The surrounding environment fell into true silence.

There were no schools of fish swimming, nor the roar of whirlpools.

Even the undercurrents that had been impacting the golden aura had vanished without a trace.

This extreme sensory deprivation is enough to destroy a normal person's mental reason within minutes, causing them to experience boundless hallucinations and lose the ability to distinguish whether they are rising or falling.

However, Fang Cheng's gaze remained unwavering.

He felt the increasingly clear call in his mind, and his legs suddenly trembled.

The true energy within the dantian surged along the meridians and then exploded from the soles of the feet.

boom!
The thick, ink-like seawater was stomped out by him, creating a visible white shockwave.

Using this violent recoil force, Fang Cheng forcefully tore apart the stagnant water around him, like a sharp axe cleaving through chaos, and cleaved downwards at an accelerated speed.

7,000 meters, 8,000 meters, 9,000 meters...

Even at such a depth that can be described as a no-man's-land, a few translucent fish can still be seen occasionally swimming along the edge.

Their skeletons are slender yet extremely resilient, and they have adapted to this extreme environment by relying on a unique internal pressure balance mechanism, becoming "permanent residents" of the ultra-deep abyss.

However, today, this ancient and unchanging netherworld water has welcomed a rude and uninvited guest.

At this moment, Fang Cheng's actions were no longer as swift and agile as before.

Once you reach this depth, every hundred meters of breakthrough downwards represents a brutal test of the limits of your physical body.

The pressure kept approaching the terrifying 1000 standard atmospheres.

With a compressive force of up to one ton per square centimeter, it is enough to instantly crush a main battle tank on land into a lump of scrap metal.

The "Primordial True Domain" that was originally half a meter thick around Fang Cheng's body was gradually compressed inward by the surrounding water flow, which was as heavy as a mountain.

The golden halo began to distort violently.

The originally raging flames were compressed into a thin, translucent membrane of light that clung tightly to his skin.

The true energy flowing above the light membrane was extremely fast, emitting a hissing sound like intertwined high-voltage electric arcs, counteracting the immense pressure from the outside that was almost enough to crush the golden body.

Fang Cheng's expression turned somewhat serious.

He could clearly feel that his entire body was under tremendous strain.

Every muscle is trembling at a high frequency, fighting against the cruelest laws of this sea.

Since the dangers lurking below are unknown, and the amount of true energy in the dantian is limited, it must be saved as a trump card.

Fang Cheng had reservations and did not fully expand his domain.

He chose the most energy-saving method, relying on "water breathing" in conjunction with his physical strength, maintaining only a thin layer of light on his body surface to counteract the deadly pressure from the surroundings.

[You are circulating your internal energy under extreme high-pressure conditions in the deep sea. Qigong experience +1]

[You are circulating your internal energy under extreme high-pressure conditions in the deep sea. Qigong experience +1]

[You are circulating your internal energy under extreme high-pressure conditions in the deep sea. Qigong experience +1]

………………

On the panel that appeared before my eyes, a series of prompts flowed by like water.

Gollum-

Suddenly, as the depth crossed a certain critical point, the previously almost stagnant state of the water was abruptly broken.

The surrounding undercurrents became turbulent and turbulent again, and the pulling force of the vortex reappeared.

Fang Cheng did not resist the force; instead, he sank down, and his falling speed suddenly increased.

The sticky feeling, like being trapped in glue, was instantly torn away, and a sense of liberation and exhilaration arose spontaneously.

It's like successfully overcoming an insurmountable obstacle.

It was at this moment that the seabed beneath his feet, which had been silent for countless epochs, gradually unveiled its mysterious veil to him.

A warm current suddenly gushed out from the icy seawater.

The water, carrying a faint smell of sulfur, surged up from below.

It's as if an active underwater volcano is lurking at the bottom of the abyss.

Fang Cheng steadied himself and lowered his eyes.

Looking down through the dark waters, one could see faint, shimmering blue fluorescence amidst the slightly blurred outlines of the terrain.

boom.

A dull thud echoed far into the abyss.

Fang Cheng's two feet finally pierced through the dark currents and landed on solid ground.

The volcanic ash and bone fragments of unknown creatures beneath our feet were thrown up by the enormous impact, forming a cloud of murky smoke that spread outwards under the golden light.

at last.

He traversed a depth of over 10,000 meters to reach the bottom of the Nagayuki Trench.

Even though the water temperature at the bottom has risen due to the influence of geothermal energy, the suffocating water pressure remains unchanged.

If ordinary metal were exposed here, it would instantly shatter into countless fragments like fragile glass.

Without the most advanced detectors to protect it, it is unimaginable how humans could venture into this dark and desolate deep-sea world.

Fang Cheng straightened his back, enduring the immense weight on his shoulders, equivalent to a mountain pressing down on him.

Although the light membrane on the body surface was compressed to the extreme, it was still bright and dazzling.

He slowly raised his head, using the light emanating from his body to survey this secluded place before him.

To Fang Cheng's surprise, this place was neither a flat, barren mudflat nor a rugged deep-sea fault.

Bathed in golden light, a magnificent panorama, capable of overturning the entire history of humankind, slowly unfolded in his spiritual perception and vision.

It was a vast, continuous architectural ruin.

The dark brown boulders, neatly cut and arranged in a staggered pattern, outline wide streets, squares, and magnificent palaces that have mostly collapsed.

Looking out, countless round stone pillars, each several meters in diameter, stand silently in the depths of darkness.

Although the reliefs on the surface of the stone pillars have been eroded by ocean currents for millions of years, they are now faded and difficult to discern.

But those rugged and grand lines still exude a desolate and ancient charm that makes people want to bow down in reverence.

This is by no means a product of nature's artistry, but rather an ancient city that was once extremely glorious.

Because of some unknown catastrophe, the entire city sank into this ten-thousand-meter-deep abyss, forgotten even by the gods.

"The professor was right after all. It seems that this is the real reason why they wanted to meet those people..."

A slight ripple stirred in Fang Cheng's heart, but he did not stop moving his feet.

He trudged through the water, each step heavy, leaving a trail of clear footprints on the seabed.

The surrounding mud and sand churned violently as he walked, like a thick gray fog clinging to the ground.

As he drew closer, Fang Cheng noticed that in the corners of both sides of the street, there were scattered huge skeletons of some unknown creature. These skeletons had a very peculiar structure, with wide ribs and sharp spines.

It seems to be some kind of extinct prehistoric behemoth, perfectly preserved in this strange environment.

What's even more eye-catching is that the surface of these bones is surrounded by a dreamlike azure light.

The light spots dissipated in the seawater, leaving behind ethereal, ribbon-like particle trails.

"Ancient remains!"

Fang Cheng's eyes narrowed, and he thought to himself.

Those ethereal blue specks of light that I spotted from above just now originated from here.

Looking at the glowing remains that covered almost half the square, Fang Cheng couldn't help but smile slightly.

This trip was truly worthwhile.

"With so many ancient regrets, let alone filling the void in the dantian, it's probably enough to break through the bottleneck of martial arts."

Fang Cheng muttered to himself, suppressing his excitement, and did not rush to pick up the bones.

Because compared to the remains on the ground, the source that called him clearly concealed a greater secret.

Fang Cheng's gaze swept over rows of awe-inspiring ruins.

Finally, we came to see a huge circular crater, which stood abruptly in the very center of the ancient city ruins.

The crater was over a hundred meters in diameter, and the surrounding volcanic rocks were smooth and glassy, ​​clearly having been subjected to immeasurable high temperatures.

A closer look reveals that the volcanic rocks are constantly spewing out "blue smoke".

Strictly speaking, this is not real smoke, but rather high-temperature hydrothermal fluid rich in minerals.

Due to volcanic activity, cracks appeared in the Earth's crust.

The icy seawater seeps deep into the cracks, is heated and boiled by underground magma, and then bursts forth again, forming a unique deep-sea hydrothermal vent landscape.

Fang Cheng slightly bent his knees and pushed off with his toes.

The powerful muscle force instantly pushed the water away.

His figure was like a bird skimming across the sea, drawing a smooth arc in the water before gracefully leaping onto the edge of the crater.

Fang Cheng hovered high above, casting his gaze down into the pit.

However, there was no dark red, churning magma, nor mountains of sulfurous ore.

What unfolded before him was a bizarre spectacle that completely overturned common sense and transcended the rules of this world.

In the very center of the crater, the deep seawater, which should have been still and stagnant, now exhibited a distorted and disordered phenomenon.

There was clearly no rotating vortex forming there.

However, the seawater within a radius of one kilometer is constantly converging towards the central focal point, following some invisible trajectory.

The seawater disappeared without a trace the instant it touched the focal point, without producing any bubbles or causing any turbulence.

It was as if that point was connected to another bottomless black hole.

Around that focal point, even space itself seemed unable to withstand some enormous tearing force.

Visually, the void there is filled with dense, crisscrossing, semi-transparent patterns.

It's like a mirror that's almost broken but barely managed to stay in mid-air, hanging there.

Fang Cheng stood on the edge of the crater and observed it carefully for a moment.

To ascertain the truth, he clenched his right hand into a claw-like shape, like a steel hook, and dug it into a protruding black volcanic rock beside him.

Then, the arm muscles exerted force, and the knuckles made a crisp, clean cracking sound.

Click.

A piece of volcanic rock the size of a fist was forcibly pried off.

Fang Cheng weighed the stone in his hand, flicked his wrist, and threw it back towards the focal point at the bottom of the pit.

The stone instantly cleaved through the seawater, leaving a straight trail.

However, when it touched the area covered with transparent patterns, it did not shatter or show any signs of impact.

Visually, it appears as merely a faint, semi-transparent ripple.

With a buzzing sound, the entire rock evaporated into thin air in an instant, leaving not a trace of dust in the seawater.

Fang Cheng narrowed his eyes slightly, a hint of understanding flashing in them.

That stone probably didn't fall down or get destroyed, but rather it fell directly into another dimension.

"Return to the Ruins..."

Fang Cheng recalled the descriptions of the bottomless valley in the sea from ancient books.

The waters of the eight directions and nine fields, the flow of the Milky Way, all eventually converge into that bottomless, desolate valley.

This spectacle, which completely defies the common sense of physics, bears a striking resemblance to the legendary Ruins that devour all things.

This is clearly a passage to another world.

According to the professor's speculation, the city submerged in the sea is clearly the remnant of an ancient civilization.

Therefore, it can be inferred that the huge animal bones scattered in the ruins were mostly brought to Earth from another world over countless eras, following this passage.

Just as Fang Cheng was deep in thought, the call that had been lingering in the depths of his soul rang out once again.

This time, the sound was not as elusive as it had been in the waters above.

As he stood at the edge of the crater, the mental fluctuation amplified several times in an instant, spreading like a tidal wave through his mind.

Fang Cheng's high mental attribute of 71 points keeps his mind clear.

Its epic, omniscient linguistic talent spontaneously led it to analyze this fluctuation.

But the feedback came back without any extraneous emotions, only a longing that transcended endless years.

There seems to be no malice involved?

Fang Cheng made a calm judgment.

But he still showed no intention of moving or entering the passage.

The primary purpose of this expedition, which ventured into a 10,000-meter-deep abyss, was to find cultivation resources that could replenish the depleted Qi Sea within the body.

As for uncovering the secrets of the truth society or solving the mystery of the source of this voice, those are just side things.

Now, the vast ancient city ruins square is scattered with piles of ancient remains.

The pure energy contained within is enough for him to cultivate in seclusion for a long time, and may even allow his extraordinary physique to undergo another transformation.

Before fully converting these acquired resources into combat power, it would be unwise to rashly cross this unknown spatial node and head to that mysterious and unpredictable other world.

For the strong, strength is the only passport to exploring the unknown.

Once he has consumed all of these remains, his strength will reach a new level.

That will be the best time to truly explore the world beyond.

With that thought in mind, Fang Cheng decisively turned around and swam back to the bottom of the volcano from the crater.

Then he bent down and reached out to grab two bones that were emitting a blue light at his feet.

He planned to take a few pieces of remains back to the surface of the sea, return to the yacht, and meet up with Lin Chuqiao and the others to put their minds at ease.

As for the remaining massive skeleton, it is actually the safest place in the dark seabed at a depth of 10,000 meters. Without the most advanced detection equipment, no one can go down there.

After he returned to Dongdu and completed the construction of the base's underground warehouses and defense facilities.

They could easily hire a large cargo ship, sail to this area, and use crane equipment for large-scale transport.

Fang Cheng clarified his subsequent plans and immediately used his feet to push off the water and prepare to float.

However, the moment he took a step, the ground beneath his feet, covered in volcanic ash, suddenly shook.

Rumble-

Immediately afterwards, a muffled rumbling sound came from all directions of the ancient city ruins without warning.

The once deathly silent Abyss Zone seemed to tremble violently at this moment. (End of Chapter)