Create an image of a futuristic underwater city, where abstract geometric structures and vibrant colors merge with the natural wonders of the ocean depths, showcasing the beauty and innovation of underwater architecture.

An advanced underwater city is envisioned in a future-setting. Lively geometric structures in radiant colors arise from the ocean floor embodying beauty and innovative aquatic architecture. The city effortlessly melds with the natural wonders of the deep sea, showcasing technicolor fish darting amongst towering skyscraper-like structures, multicolored seaweed swaying beside spherical buildings, and the dreamy illumination of bioluminescent creatures contrasting against the steel-blue of the expansive underwater metropolis.