Hyper-detailed, photorealistic close-up of a partially buried cybernetic skull emerging from a dark, alien seabed, bone surface eroded and encrusted with porous white coral and tiny crimson spores, exposed biomechanical machinery made of polished brass, oily black chrome and tangled fiber-optic cables, glistening with moisture, soft volumetric underwater lighting, murky green water, hazy god rays and subtle caustics, micro-particles floating, eye sockets hollow with dim red internal LEDs, circuit patterns beneath translucent plating, surrounding ground is fractured volcanic terrain covered in dark rock, glowing embers, scattered metallic debris, extreme texture detail, cinematic depth of field, ultra-high resolution, 8K, hyperreal materials, subsurface scattering, global illumination, dramatic atmosphere, concept art style suitable for sci-fi horror film poster