gel sack, subnautica, below zero, underwater, bioluminescent, purple, bulbous structure, alien plant, aquatic, soft texture, translucent, jelly-like, marine life, surrounded by kelp, sea floor, ambient blue light, soft shadows, 3D rendering, realistic, high detail, close-up, ecosystem, survival game element, resource harvesting, serene underwater scene, vibrant colors, depth of field, underwater flora.