The surrounding scenery changed rapidly as Su Ze and Mr. Ya tunneled deep underground.
The temperature and pressure mounted, and Mr. Ya's energy expenditure was constantly increasing.
Finally, at a depth of three thousand meters, they found a cave dug out by some unknown mutant beast and took shelter there for the time being.
The black soil of the Thousand Heroes Tomb hadn't spread this far down; it had stopped at a depth of about seven or eight hundred meters.
Mr. Ya panted heavily, swallowing an evolutionary restorative to recover his stamina.
Tunneling this far would have been easy on the surface, but burrowing deep underground presented immense resistance, and the energy drain was even greater.
Mr. Ya slumped to the ground. "Boss," he said, "where are you planning to look for the Gravity Demon?"
