Xu Qingtong reached the location marked on the map. Sure enough, there was no longer an island here!
"No! There's a submerged island here!" With a stir of his divine sense, Xu Qingtong discovered something dark faintly visible beneath the surface!
A submerged island was an island hidden underwater. When the tide receded, these islands would emerge above the surface. At high tide, they would be swallowed by the sea again.
Xu Qingtong steered his flying boat in several wide circles around this stretch of sea, then had a clear idea of the situation!
This was where Great Marsh City had stood ten thousand years ago. Now, it had sunk beneath the sea. Without his sea map, finding it would have been all but impossible!
Xu Qingtong kept his flying boat hovering above the site of Great Marsh City and waited for two days, but the tide never receded to reveal the city.
With no other choice, he put away the Dust-Exterminating Boat and jumped into the sea.
After sinking less than a hundred feet, Xu Qingtong's feet touched the ground.
He looked around and found ruined walls everywhere, their architectural style identical to that of the buildings on Red Moon Island.
Xu Qingtong walked slowly underwater, releasing his divine sense to examine his surroundings carefully without overlooking a single spot.
After roughly the time it took to drink a cup of tea, Xu Qingtong could no longer hold his breath. He surfaced and drew a deep breath. Just as he was about to dive again, he suddenly remembered the shell Xizi had dug up for him in the Valley of the Dead!
Shells like this were usually worn around the necks of Sea Tribe members. He did not know what other uses they had, but he did know they