Prompt: imagine underwater metropolis encapsulated within a colossal glass-domed tunnel, with bioluminescent flora and aquatic life surrounding advanced subaquatic infrastructure; vehicles and submarines traverse amidst coral-covered arches and high-tech stations, while schools of fish dart through the bustling aqua avenues, illuminated by a constellation of submarine lights under a serene water surface pierced by rays of sunlight --vibrant --stylize as an otherworldly merger of nature and futurism, serene and bustling with life.