Create a futuristic underwater building with large, open spaces illuminated by natural light filtering through the water above. The interior should feature massive, twisting structures filled with vibrant coral reefs and marine plants. Fish, sea creatures, and schools of colorful fish swim around the organic, flowing architecture. The design should evoke a harmonious blend of nature and technology, with transparent walls allowing for an expansive view of the ocean outside. People walk around the serene, immersive environment, dwarfed by the scale of the aquatic displays and the architectural details.