An Art Nouveau-inspired undersea fantasy world where marine life and technology coexist, featuring a steampunk octopus directing an orchestra of glowing jellyfish playing golden harps, deep-sea divers in Victorian attire curiously observing from vintage submarines adorned with intricate gears and stained glass, illuminated by the ethereal glow of bio-luminescent seaweed, capturing a whimsical blend of elegance and adventure.