Tall stone obelisk anchors an underwater ancient plaza flanked…

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This atmospheric fantasy 3D render shows a vast empty sunken plaza centered on a towering grey stone obelisk, flanked by long weathered Roman-style columned arcades. Dappled bright blue light filters through rippling upper water, casting soft glowing patterns over the smooth sandy ground of the lost underwater city. The mood is quiet and mysterious, evoking the grand scale of a forgotten ancient civilization.