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Now reading: Chapter 91 91: The Principle of the Depth Seal from Longevity in Naruto, a Action novel by Dicard4.

The new training thodology, the "Depth Seal," operates on a clear and direct chanical foundation: the continuous and intense absorption of surrounding air into a single, precisely concentrated, and defined zone. As the seal draws in more atmosphere and imprisons it within that confined space, the total atmospheric pressure inside rises in direct correlation. It is a fundantal physical principle: less volu, greater quantity, higher pressure.

In theory, from a purely speculative perspective, if the seal were to continue its absorption without pause for a sufficient duration, Dan could mathematically reach a pressure level equivalent to twenty thousand ters below the ocean's surface. Such a force is staggering—a terrifying weight capable of crushing and pulverizing even the densest tals.

However, in practical reality, that figure remains a theoretical calculation on parchnt. Even with his current imnse strength, Dan cannot yet exert total control over such a hazardous level of compression. At those extres, the seal itself becos unstable, threatening to rupture and making precise manipulation nearly impossible. Consequently, the maximum threshold he can safely and steadily maintain at this stage is a pressure equal to ten thousand ters below sea level.

Even this "safe" limit is monuntally dangerous—a force that would instantly claim the life of any ordinary creature. But Dan is no ordinary being; with his reinforced physique, he can regulate this power with relative stability. This represents his current technical ceiling. In the future, as his strength and understanding deepen, he may raise this limit further.

Naturally, he cannot yet perform actual physical training at that ten-thousand-ter peak. That number represents the limit of his control over the seal, not the limit of what his body can endure for sustained exercise. Currently, his actual training level—the environnt in which he exerts himself for hours daily—is an atmospheric pressure equivalent to only one thousand seven hundred ters underwater.

The word "only" is deceptive. This is a gargantuan pressure, many tis greater than standard atmospheric weight. Yet for Dan, it is the necessary baseline, and he recognizes he still has vast room for progression. Years of incrental training lie ahead of him: slowly increasing the pressure, allowing the body to adapt, and tempering the bones and muscles. It is a long road, but a promising one.

This remarkable technique enhances his prowess in nearly every aspect through consistent use. When the seal is activated within the designated training zone, it draws air molecules and moisture from the environnt with relentless intensity, condensing them within the confined space. This creates a simulation of the deep ocean's abyss, providing the specific effects he desires for his physical evolution.

First: Movent Resistance and Speed Training.

Every motion perford under this imnse pressure—lifting a hand, running, or jumping—encounters imdiate and massive resistance from the tightly packed air and water molecules around him. The air itself becos as dense as a heavy liquid. It is akin to moving through thick molasses or heavy sludge. Every movent is slowed, difficult, and requires double the effort. It is classic heavy-weight training, but exponentially more effective because it targets every part of the body equally, both internally and externally.

Second: Strengthening Bones, Ligants, and Physical Durability.

Under constant, extre pressure, Dan's bones, ligants, and tendons are subjected to force from every direction—a weight that literally attempts to crush, compress, and shatter them. However, the human body possesses remarkable natural defense chanisms. As a biological response to this sustained, massive load, the body automatically begins to increase bone density. It deposits more minerals, reinforces the internal architecture, and thickens the cortical bone. Simultaneously, it strengthens the ligants and tendons that bind the skeleton together, making them more resilient, powerful, and resistant to tearing. The end result, after months and years of such conditioning, is a far more solid physique—bones that are nearly unbreakable and ligants as strong as steel cables. He becos capable of withstanding powerful strikes without fracture, achieving a state of superhuman durability. Crucially, Dan manages this without altering his outward shape or size, exerting control over his body to ensure he remains within a human fra.

Third: Improving Chakra Efficiency and Control.

To simply remain alive under such pressure, let alone train, Dan is forced to maintain a thin but constant layer of protective Chakra active both around and inside his body. This layer shields his sensitive internal organs—the lungs, heart, and brain—from being crushed. Maintaining this layer steadily for hours requires a continuous and highly precise flow of energy, especially as it is drained rapidly by the surrounding weight. Simultaneously, he must maintain the Depth Seal itself. This constitutes elite training in the minute and precise control of Chakra.

Fourth: Rapid Adaptation to Sudden Changes.

When the training session concludes and Dan abruptly deactivates the seal, stopping the absorption and releasing the compressed air, a violent and sudden change occurs in the environnt. He goes from the pressure of one thousand seven hundred ters underwater back to standard atmospheric pressure in an instant. The body feels a near-total absence of weight and resistance, as if it were suddenly taking flight. This sharp, repeated transition—experienced daily—greatly aids in developing neural and muscular reaction speeds. The body gradually learns to deal instantaneously with extre and rapidly shifting environnts. If it is heavy, it adapts; if it is light, it adapts; if it changes suddenly, it adapts quickly.

Combined, these effects—speed, durability, Chakra control, and rapid adaptation—make the Depth Seal a comprehensive and awe-inspiring training tool. It does not rely improve a single facet; it elevates almost everything. A stronger body. A faster pace. Higher durability. Greater efficiency. This is exactly what he pursues: total strength. Not a narrow specialization, but supremacy in every domain.

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If you are enjoying this work and would like to read the upcoming chapters , you can access the advanced chapters on Patreon.

Patreon :Aaron4dicard

I publish several chapters there before they are released here, you can join through the link partreon/Aaron4dicard Thank you to everyone who reads and supports the work.

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