A swimmer descends through green water with hair floating upward

2x2 grid, 16:9, do this for 4 clever ai inferred scenes: input = [ swimmer / water_context / submerged_moment / capture_medium / water_optics ]

run underwater_submerged:
subject_dna    := a person submerged, hair fully wet and suspended — floating in strands, moving with the
                  water, never dry or styled; fabric ballooning and drifting with buoyancy; skin slightly
                  desaturated and refracted
context_dna    := infer pool, ocean, lake, or quarry; depth, clarity, particulate matter in the water
moment_state   := mid-descent, mid-turn, or a held float + causal_hint (just jumped in, pushing off, exhaling)
capture_dna    := wide lens in a housing, slightly soft from water, distortion at the edges, natural light
                  from above, some backscatter on particles
focal_anchor   := the face or hand sharp; drifting hair and distant water dissolve into blue
light_logic    := sunlight refracting through the surface into moving caustic patterns across the body and
                  floor; god-ray shafts; color absorption with depth — reds and warm tones die first, blues
                  and cyans dominate as distance increases
imperfection   := bubble trails from the nose and mouth, backscatter specks, surface chop distorting the world
                  above, a slightly awkward buoyant limb
depth & frame  := looking up toward a bright wobbling surface or a split water-line frame; vertical or square
water_optics   := refraction bending limbs at the surface line, the mirror-like underside of the surface,
                  distorted reflections
mood           := weightless, dreamlike, quiet, suspended

render: one honest instant where real water optics make the image.

forbidden — objects: dry-looking styled hair underwater, no bubbles, perfect makeup, staged mermaid clichés
forbidden — look:    impossible clarity at depth, full warm color saturation deep underwater, hair behaving
                     as if in air, missing caustics, no buoyancy in fabric