Ancient, mysterious, underwater ruins, Cthulhu origin, dark green seaweed, coral reefs, glowing bioluminescent creatures, eerie red eyes, tentacles, massive stone statues, intricate carvings, forgotten city, sunken temple, dimly lit, foggy atmosphere, mystical artifacts, ancient scrolls, forbidden knowledge, Lovecraftian horror, cinematic composition, low-key lighting, deep blue and green hues.