Ancient, mysterious, underwater temple, eerie glowing eye of Cthulhu, octopus-like tentacles, dark green slimy skin, intricate carvings, worn stone walls, dimly lit, bioluminescent mushrooms, seaweed-covered pillars, ritualistic symbols etched into the floor, a sense of foreboding doom, Lovecraftian horror, cinematic composition, low-key lighting, shallow focus, eerie mist surrounding the temple.