After shrinking down, Chu Fei's "hardness" increased once more.
The hardness of the Nanofluid Metal on Chu Fei's surface had now surpassed its limits. With the support of Hyper-Dimensional technology, the earth before him was like water, allowing him to move through it freely.
In just one day, Chu Fei reached a depth of eight hundred kilometers.
The pressure here was already nearing three hundred thousand atmospheres, exceeding expectations—according to previous estimates, it should only have reached three hundred thousand atmospheres at a depth of one thousand kilometers.
The reason was that the density of matter inside the earth had increased, causing the pressure to rise.
The deeper he went into the earth, the more high-density metallic matter there was. Combined with the compression from the immense pressure itself, the average density of the surroundings had reached seven grams per cubic centimeter, close to the density of iron.
Chu Fei made a rough estimate. At a depth of one thousand kilometers, the density would likely reach around nine grams per cubic centimeter, exceeding that of copper, while the pressure would reach four hundred thousand atmospheres.
Even Chu Fei was beginning to feel strained.
At that moment, a question suddenly came to him: Were there really traces of the former Saron Civilization beneath the earth?
But since he had already come this far, he might as well persist a little longer. He was already here, after all.
In fact, Xue Xingyu and the others had also conducted modeling analyses and considered the possibility quite high.
According to the latest and most optimistic analysis, the Saron Civilization might once have established facilities resembling seed vaults within large mines. Later, as the earth subsided, those mines gradually sank into the crust. That would also explain why no traces of passageways could be found.