underwater scene, Subnautica game environment, resource nodes, regrowth over time, coral reefs, kelp forests, deep-sea vents, alien aquatic flora, survival game mechanics, resource harvesting, ecosystem simulation, realistic textures, rich marine life, ambient lighting, soft shadows, immersive experience, first-person perspective, exploration, resource management, survival strategy, vibrant colors, dynamic weather effects, day and night cycle, high-resolution textures, 3D models, detailed ocean floor, procedural generation, sandbox gameplay, resource respawn system.