Ужас в стиле Лавкрафта под водой

A massive ancient entity with tentacles and many eyes emerging from a lightless oceanic abyss, glowing eerie green runes on its skin, a tiny deep-sea submarine in front for scale, dark oppressive atmosphere, volumetric water effects, full body visible, centered composition, nothing cropped at edges, 8k, ultra detailed, high resolution, masterpiece quality