Eastern Sea.
At the depths of the sea, in complete darkness.
Fang Yuan's main body concealed his movements as he secretly arrived here.
A huge translucent bubble could be seen in front of him.
"This should be the place." Fang Yuan realized, he stopped moving, closely inspecting it.
This bubble was formed in a special manner, it was a secret underwater world created from many elements, like an underwater volcano's eruption, the surrounding sea water, and the qi tides that swept past previously.
Fire path, earth path, water path, and qi path, the dao marks of these four paths created this isolated utopia.
This place was very well hidden, unless any Gu Immortal saw it personally, it would be hard to detect.
"I'll name this the four paths air bubble." Fang Yuan activated his investigative method and observed the surroundings, before opening his immortal aperture's entrance to let out a Gu Immortal.