underwater scene, Subnautica game environment, resource nodes, regrowth over time, crystal formations, coral reefs, kelp forests, teeming marine life, survival, exploration, resource management, day-night cycle, soft ambient lighting, first-person perspective, realistic textures, vibrant colors, immersive atmosphere, ecosystem interaction, resource harvesting, player action, game mechanics, lush underwater flora, diverse aquatic fauna, sandbox gameplay, resource respawn mechanic.