Atlantis: Story of a Lost City (aka At Lost) is an unpublished light novel by Skittyoung. (Atlost ought to be all one word, but the wiki insists on separating it.)
Atlantis was never lost beneath the waves. All along it was a floating city, reflected in the water. The inhabitants of the floating city possess psychic powers, and when Atlantis reappeared, these powers awakened in the Atlanteans' descendants.