A hyperrealistic digital painting depicting a colossal, bioluminescent jellyfish floating serenely through the ruins of a submerged futuristic city. The jellyfish's bell pulsates with a soft, ethereal light, illuminating the coral-encrusted skyscrapers and robotic remnants below. Schools of tiny, glowing fish dart around its tentacles, creating a mesmerizing spectacle of light and shadow. The composition is a wide-angle shot, capturing the vastness of the underwater cityscape and the otherworldly beauty of the jellyfish. The color palette is dominated by deep blues and greens, accented by the vibrant bioluminescence of the jellyfish and the surrounding marine life. The overall atmosphere is one of serene wonder and melancholic beauty, reminiscent of a lost civilization reclaimed by nature. 4k resolution, masterpiece.