Relics of an Indigenous Civilization

While he was thinking like this, the sea turtles carried Zhang Ming to the eastern bay, swimming toward the direction of a giant karst cave. This was a completely new, unknown realm. The swaying seawater rose and fell in the twilight sunset, crashing wave after wave against the turtle shell. Zhang Ming held a turtle neck with one hand and grabbed the Golden Electric Eel with the other. Colorful corals occupied every corner of the cave, and schools of nameless fish shuttled between the rocks and seaweeds. Glass-like glowing plants dotted the cave, illuminating the inside as bright as day. What surprised Zhang Ming even more was that faint murals were revealed on the rock walls. And... Unknown characters! There were even large tracts of submerged houses at the bottom of the sea. Are these the traces left behind by that extinct Indigenous Civilization? Various guesses arose in Zhang Ming's mind as he used Extraordinary Vision to examine these murals with curiosity. What a pity, the ruins have been destroyed by these marine creatures. The dust of history was buried too thickly, so that most of the traces were slowly aging. Time was like an hourglass, calculating the sequence of dynasties, burying insignificant data. When everything returned to dust, who could prove that we had once been here? ... After about a quarter of an hour, they reached the final destination. The cave offered another world within, and even had a small patch of dry land. "Awoo," the Little White Turtle called out loudly, as if saying, "This is our home!" Standing on the back of the oversized turtle, Zhang Ming widened his eyes and saw collapsed artificial buildings. And... A... very strange turtle! This turtle wasn't large, but it had the feel of a divine beast. Its entire body