Submerged ancient library interior with towering ornate bookshelves stretching into dark waters above, mermaid with iridescent tail scales reading a floating book in a beam of light filtering through stained glass windows, schools of tiny bioluminescent fish illuminating dark corners, massive marble columns covered in coral and seaweed, floating particles catching light like underwater snow, weathered leather-bound books on wooden shelves with gold lettering still visible, old reading tables and chairs partially buried in sand, giant antiquarian globe covered in coral growths, hanging chandeliers with jellyfish nestled among the crystals, rays of sunlight creating dramatic light shafts through water, floating scrolls and loose pages creating ethereal patterns in water currents, ancient stone archways draped with flowing seaweed, mermaid's long flowing hair moving gracefully in gentle current, g,UnderwaterElegance,Mermaid