underwater landscape, Subnautica game map, vast ocean, alien aquatic flora, coral reefs, deep sea trenches, volcanic areas, sunken alien facilities, kelp forests, diverse biomes, teeming with alien sea life, exploration, survival, mysterious atmosphere, ambient lighting, natural underwater structures, 3D environment, panoramic view, realistic textures, high-resolution, detailed environment design, expansive sea floor, interactive ecosystem, day-night cycle, dynamic weather effects.