futuristic underwater cityscape camouflaged in a colorful kelp forest with buildings sculpted in colorful corals at flynn reef, starfish shaped buildings by oscar niemeyer, coral bridges by wlop, solarpunk, alien biology, golden bubbles and robotic fishes, golden ratio, rule of thirds, octane render sidefx isotropix nvidia omniverse materialx osl redshift arnold unreal engine, hyper detailed, sharp focus