"Ten years ago…" Charles held the skull and looked around at the forest that had no traces of human existence.0

The existence of a human skull here meant that humans had been here before. Ten years ago, Charles was still struggling for his own survival in the Subterranean Sea, but there were already people living on the surface.0

Did the Foundation come up here earlier? Or could this skull be from a native of the surface world? Perhaps the reason behind the emptiness of the surface world was that the people on the surface had already flown up and lived in the skies.0

The skull was covered in the same eerie moss as the trees nearby, and as Charles stared at the skull, more questions popped up in his mind. Unfortunately, there weren't any more clues to be seen, so Charles decided...0