At this depth, the seawater was almost pitch black. Yet in Fang Yuan's field of vision, everything was a dim green.
"Good, this newly acquired Gu is quite useful. With it, I can barely see in the deep sea." Fang Yuan felt a flicker of joy.
The deep sea was complicated. Many times, one could not blindly create light, since no one knew what kind of predator it might draw over.
Amid the dim green, several patches of deep black drifted.
They were naturally black oil.
The black oil streams crossed and tangled together, like a cluster of bizarre gigantic beasts. They were nearly motionless, yet they still delivered a powerful visual shock.
Fang Yuan drew a deep breath. The gills on both sides of his cheeks continuously opened and closed, filtering air from the seawater to sustain his life.
Steadying himself, Fang Yuan cautiously approached the black oil. His hands slowly reached out, then stopped when they were still a foot away from it.
Then, he activated his Gu worms. Bright blue light gradually condensed in both palms. Each ball of blue light formed a tiny beam, shining upon the black oil. Bit by bit, clump by clump, the black oil was drawn out along the two miniature blue beams and absorbed into Fang Yuan's palms.
Fang Yuan's palms were like two bottomless pits, endlessly swallowing black oil.
Time slowly passed, while Fang Yuan remained highly alert at every moment.
Not only did he keep watch over his surroundings, he also kept an eye on the reserves of primeval essence in his aperture.
As he was activating several Gu worms at once, Fang Yuan's primeval essence was being consumed quickly. Before long, it reached the warning point.
"It is time to stop and return to the surface to rest.