Qu Jianlei surveyed stars for many days and naturally knew that some stars had natural caves.
However, natural caves and those crafted by human hands are ultimately different.
Even if the elemental aura during the crafting process is erased, there remains a difference.
Indeed, there is a distinction between natural creations and those made by humans; perhaps someone can mask them skillfully, making them hard to detect.
However, upon reaching Supreme cultivation level, the sixth sense is greatly enhanced, making it quite easy to detect anomalies.
Back then, when someone searched for Qu Jianlei, they found someone else's secret vault for this very reason.
Thus, Qu Jianlei can ascertain there is a problem with this stone cave.
He descended to inspect it and, sure enough, it was a secret vault built by an Awakened, containing quite a lot of supplies.
Upon careful perception, he confirmed that this secret vault hadn't been visited for at least thirty years.
