submerged alien structure, underwater enforcement platform, Subnautica game, Precursor architecture, bioluminescent algae, moonpool, green glowing energy, sci-fi materials, intricate patterns, monolithic appearance, ocean floor, surrounded by aquatic life, coral reefs, fish schools, ambient underwater lighting, wide-angle lens, distant shot, mysterious atmosphere, advanced technology, submerged ruins, alien inscriptions, holographic interfaces, large archways, submerged pillars, crystal-clear water, sunbeams penetrating the ocean, high-resolution textures, reflective surfaces, eerie silence, submerged alien civilization, exploration theme, futuristic design.