Patch of sea grass about 2 m across and 0.9 m tall, forty blades leaning at their own angles out of a low silt bed. Dimensions 2.00 by 0.99 by 1.80 m (X by Y by Z). Metre units, +Y up, +Z front, origin on the footprint at seabed level. Static: grass sways along its whole blade, which needs a joint per segment or a shader rather than one rigid node transform. Sunken city palette: weathered grey limestone and dark algae stained stone, pale silt, deep green weed, coral pink, waterlogged timber, tarnished bronze and one translucent blue emissive for glow, bubbles and light. Static geometry; no rig, animation, collision or navigation data.