A luminous underwater cathedral submerged in crystalline turquoise ocean, ancient stone arches and towering columns wrapped in living coral and swaying sea fans, schools of iridescent tropical fish swimming through shafts of golden sunlight penetrating the surface, massive sea turtles gliding past weathered statues covered in barnacles and anemones, volumetric light rays creating ethereal prismatic effects through the water, rendered with Unreal Engine 5 raytracing and PBR materials, reimagined as hand-painted Studio Ghibli animation with visible brushstrokes, cool aqua and amber gouache color palette, cinematic wide composition with strong architectural perspective and mystical atmospheric depth