The territory Dan designated for his perilous training with the Depth Seal lies in a remote stretch of wilderness, roughly one hundred kilometers from the main family base. Within the clan, he has marked this area with absolute clarity as a forbidden zone—a place where entry is strictly prohibited for anyone, under any circumstances. There are no exceptions, and no leniency.
His reason for this isolation is not a desire for privacy or a need to hide his personal regimen; rather, it is because the Depth Seal is inherently lethal to anyone in its vicinity during activation.
When triggered, the technique encompasses a perfect circle with a diameter of two hundred meters—a relatively vast area. Inside this perimeter, the meticulously drawn and activated seals begin to draw in the surrounding atmosphere with relentless intensity from every direction. Air is sucked violently toward the center, where it is subjected to gargantuan levels of compression and condensation. This constant, powerful suction creates a series of atmospheric disturbances and severe collateral hazards.
First, the immediate area surrounding the seal becomes dangerously oxygen-depleted. As the air is pulled toward the center, the oxygen within it vanishes along with the bulk of the atmosphere. Any ordinary person—or even a powerful warrior—who approaches this zone would immediately suffer from acute hypoxia. Shortness of breath, dizziness, and physical collapse follow swiftly. If one remains too long, death by suffocation is a certainty. It is a direct and lethal threat.
The second danger emanates from the core of the seal itself. Within the central circle, the extreme pressure and high density of the compressed air generate a massive, unnatural gravitational pull. This is not standard gravity, but a force born of sheer density; a gargantuan mass of air condensed into a tiny space creates its own powerful attraction. This force drags everything nearby toward the center—trees, boulders, wildlife, and people—pulling them in to be crushed.
While Dan maintains constant, precise control over the seal during his sessions, consciously neutralizing this gravitational pull, he is aware that even a moment's distraction could be fatal. Should his focus waver for even a fraction of a second, the gravity would be unleashed, dragging in and pulverizing everything in its path. It would be an absolute catastrophe for any bystander. Thus, the zone remains forbidden: distant and safe.
Furthermore, within the reach of the seal, the earth beneath Dan's feet is subjected to unbelievable force. The sustained weight—thousands of times greater than normal atmospheric pressure—crushes the soil and rocks with terrifying power. In the area where he consistently trains, the very nature of the ground has transformed. The ordinary earth has vanished, the soil having been practically evaporated. In its place lies a solid floor made of... Diamonds.
Yes, genuine diamonds and other vibrant gemstones—rubies, emeralds, and a spectrum of crystalline minerals—have formed naturally under the intense pressure and heat. These are the primary factors required for diamond formation deep within the planet's mantle, and Dan provides these exact conditions, with even greater intensity, directly on the surface. The result is a floor of pure, shimmering gemstones—beautiful, radiant, and incredibly valuable. Yet, Dan remains indifferent to their material worth; he views them merely as an interesting and aesthetically pleasing byproduct of his work.
The final and perhaps most volatile danger is the heat. Inside the central seal zone, temperatures soar to staggering levels. This is a fundamental law of physics: when gases are compressed with such immense force, their temperature rises automatically. During his early years of experimenting with this complex art, this thermal property caused numerous disasters. The combination of extreme heat and highly concentrated oxygen in a small space created a literal explosive mixture, resulting in instantaneous infernos and violent, blinding fireballs.
It took him years of failed experiments and multiple explosions to master the methods of heat dissipation and insulation using supplementary seals. Now, he possesses total control.
Consequently, as Dan performs his intense physical conditioning under this crushing weight, he must simultaneously maintain absolute mental focus on the seal's many facets:
Pressure Control: Ensuring the weight neither fluctuates nor fails.
Gravitational Management: Constantly neutralizing the inward pull.
Thermal Regulation: Dissipating and insulating the extreme heat.
Flow Stability: Maintaining a steady, unwavering rate of absorption.
All of this must be managed at once, in every single moment, with total concentration. If the seal were to fail in even one aspect, the entire system would collapse instantly, releasing all the stored energy in a singular, incredible blast. Such an event would cause widespread devastation, leaving deep craters and shockwaves that would level everything for kilometers.
Simply keeping the seal stable and active is an exhausting mental feat, even without the added physical strain. Maintaining it for hours drains both Chakra and focus immensely. Yet Dan does this while simultaneously training his body—running, leaping, striking, and kicking under the massive load. It is a comprehensive ordeal for both mind and spirit.
Thus, while the Depth Seal is dangerous, complex, and draining, it serves him in a multitude of ways: strengthening the physique, increasing speed, refining Chakra control, bolstering mental focus, and heightening the ability to manage complex crises. It is the perfect, all-encompassing training tool.
Most importantly, there was one specific concern that had occupied Dan's mind for a very long time—since he first seriously contemplated immortality and the extension of his lifespan upon arriving in this world decades ago. Recently, thanks to this technique and its beneficial side effects, the problem that had plagued him for decades has finally been resolved.
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