After that soldier left.

Wang Ye returned to the pit,

looking down.

After half a day of training and digging,

his excavation depth had now reached over two thousand meters.

The Excavation Skill had also improved to lv4.

Even Wang Ye himself was slightly astonished by such digging efficiency.

Due to his excellent Perception Ability, he could easily sense his current depth.

So he could clearly understand the improvement in his excavation speed.

From about 0.2 meters per second initially,

to ten meters per second now.

This improvement can be described as a complete transformation.

Wang Ye leapt once again, diving into a depth of over two thousand meters underground.

While this depth is already quite deep for ordinary people,

in the entire scientific field, it is not considered very deep; in fact, some laboratories are built at this depth underground,

like the "Jinping Extremely Deep Underground Dark Matter Laboratory" in Sichuan Province.

The reason it is built so deep is to shield against interference from various cosmic rays and other factors.

According to research, Dark Matter can penetrate anything, and at this depth, other cosmic rays cannot enter, only Dark Matter can penetrate through. If the detector in this laboratory reacts, it means Dark Matter has been found.

However, the laboratory is almost always deserted because at this depth, it is almost impossible for any living organisms to survive. Currently, the deepest known habitat of multicellular organisms is three thousand six hundred meters, and the organism that can survive here is called the "Demon Worm." Experts have conducted certain research on these worms and discovered that they can survive in extreme high temperature, high pressure, and oxygen-free environments, so there is speculation that they can also survive in the Cosmos.

According to scientists’ speculation, since Demon Worms may appear at this depth, it implies there might exist an unknown ecosystem underground, though humans have temporarily been unable to explore such depths, thus cannot know the exact situation there.

However, Wang Ye was close to exploring this depth now. With his current physique, surviving at this depth was no problem, even though sunlight couldn’t be absorbed for energy, but the temperature here was relatively high, providing some heat which Wang Ye could transform into energy.

He leapt, landing at the deepest part of the pit.

The temperature here had reached about sixty degrees Celsius; a normal person standing here would likely suffer heatstroke and pass out. It’s known that even enduring forty-degree summer temperatures on Earth is tough for a normal person, and slight exertion could lead to fainting, while fifty or sixty degrees could be fatal.

The pressure had also reached 49 MPa, higher than the pressure under two thousand meters of seawater. Without protective suits, a human’s lungs would directly collapse, because the pressure on the thoracic cavity is roughly equal to that on the body surface; though the surface might withstand this pressure, the fragile internal organs cannot, yet Wang Ye felt nothing, as his internal organs’ strength was about a hundred times that of normal humans, coupled with Vajra Indestructible Gang Qi’s protection, even if the pressure were hundredfold higher, he would feel no pressure.

Similarly, the rocks here had been under pressure for years, with hardness significantly higher than those on land,

around twenty-five hundred kilograms per cubic meter, which is the density of common granite and basalt on the surface; to drill here, high-temperature alloy drill bits like tungsten carbide must be used, and the cooling system is extremely costly.

Wang Ye, as he dug here, noticeably felt a bit strained—not that he couldn’t dig, but because the chromium alloy nails he grew would weaken or deform slightly due to high temperature and hard rocks, requiring regeneration of new chromium alloy nails.

This phenomenon further strengthened Wang Ye’s determination to change his bone material.

As he dug to this depth, he also attempted synthesizing carbon atoms within his body slightly, but there was still no change, not even a diamond could be synthesized...

"Seems I need to dig deeper." Wang Ye shook his head, dispelling his thoughts, and continued controlling the chromium element in his body to grow new nails. The nails he grew were not very sharp or long, but extremely specialized like a mole’s; such nails had higher strength and wouldn’t break with slight scraping like long, thin nails.

The only disadvantage might be the excessively blunt ends, so penetration wasn’t very strong, but for the rock’s current firmness, it was still sufficient.

Wang Ye touched the granite layer in front of him; this rock was unique to deep underground, extremely hard. Its whole body was gray-white, and the surface felt very rough to touch. Its Mohs hardness is usually between 6-7, much harder than iron. He glanced at it, touched and tapped it lightly, knowing instantly where the weakest point of the granite layer before him was.

Being midnight, there was practically no light above ground. Underground, it was even darker, usually miners working in tunnels would wear miner’s lamps on their heads; otherwise, they couldn’t see anything.

Yet now Wang Ye wore no luminescent technological products, relying purely on the glow emitted by his body to illuminate the surrounding area. His current Human Body Glow, if fully activated, was actually more effective than most high-lumen flashlights because he could illuminate every position around indiscriminately, and the brightness was not low.