Diver Transforms Into Abyssal Sea Monster

A diver floats motionless in pitch-black ocean depth, a single beam of light cutting through the dark. Bioluminescent veins begin threading across their body in accelerated time, skin shifting to iridescent obsidian scales, limbs fusing into massive finned appendages. The figure swells to monstrous proportions, displacing water in shockwave pulses. Final shot: a colossal sea creature dissolving into the abyss. WETA-level underwater VFX, deep teal and void-black tones.