The threat of death made Xia Nan inspect with utmost precision at this moment, from top to bottom, from left to right, tracing every texture with his fingertips.
Finally!
As he crouched halfway, groping at the lower right corner of the black wall.
A trace of extremely faint phosphorescence caught his attention.
It was the peculiar blue glow unique to cave-dwelling fungi, but its source was a crevice in the rock at the corner of the black wall!
"Could it be..."
A flash of delight crossed Xia Nan's eyes.
He suddenly bent down, using his palm to move the loose rocks aside.
When encountering smaller gaps, he even pulled out the dagger from his waist, using all his strength to pry the stones up.
After about twenty minutes.
A small hole, about half a person's height, appeared in the corner of the black wall before Xia Nan's eyes.
The faint blue light became even more bright.
Alone, without regard for his posture.
He used both hands and feet, following the light and crawled in.