```
Splash!
Before he could react, another rushing wave of water sound erupted from behind him.
Zhao Sheng turned around and saw that the luminous wall of the passage had somehow disappeared, and now a massive amount of seawater was gushing in.
The strong water pressure of the seabed forced the water to shoot in violently, forming a thick, straight jet of water.
In just a few breaths, the water in the underground cave had reached his waist.
Hai Lan'er clung to Zhao Sheng's arm in fear.
Zhao Sheng gave a slight tug, and, seeing that it did not budge, he let it be.
Soon, the underground cavern was submerged by the seawater!
Half an hour later, Zhao Sheng and Hai Lan'er emerged from the underwater cave.
Gazing at the dark blue "vast ocean" below the sea, Zhao Sheng's pupils suddenly constricted.
He was astonished to find that the deathly black qi above the blue flames had disappeared.
As for why it disappeared?
