A realistic AAA game render of an underwater bubble column, rising slowly from a single narrow source point at the bottom, spreading slightly and moving upward in a natural, random pattern, just like in a real aquarium. The bubbles vary in size, with realistic light refraction, transparency, and soft highlights. Fine details include tiny micro-bubbles and subtle distortion of light through the water. The background is a solid green screen for easy compositing. High resolution, ultra-realistic textures, physically accurate lighting and shading, clean alpha edges, isolated subject, perfect for use in a 3D game asset.