underwater, crystalline sulfur, resource nodes, cave systems, brine pools, volcanic areas, thermal vents, Lost River biome, Grand Reef, Safe Shallows caves, alien vents, yellow deposits, hazardous flora, sea creatures, exploration, diving suit, submersible vehicle, ambient lighting, murky water, bioluminescent plants, survival game, resource gathering, first-person view, realistic textures, detailed environment, immersive experience.