The chamber he built here was enough to accommodate twenty up to thirty masters, sitting here, training and living for a long time without an issue.
"I can build more chambers," he looked at the remaining big space around the hole opening, and envisioned this place filled with chambers, looking like bubbles attached to the ceiling from down below.
As he felt the greatness of this training, he kept doing it for the upcoming three days. At the same time, he made sure to check his spirit power daily.
Every day, he'd gain around one hundred up to three hundred spirit powers. It wasn't much indeed, but compared to the normal snail advancement speed of other training techniques and methods, this was by far quite shocking.
Not to mention if he managed to elongate his time of stay down below, then this number would increase.