Plausible futuristic infrastructure for an underwater micronation built 300-500 feet below the surface

My story takes place hundreds of years in the future after global warming has made life at the surface uninhabitable for most life forms. What's left of mankind survived because it became popular to build cities underwater before things at the surface became dire.

Obviously these cities would have to be self sustaining in order for humanity to survive. I envision them growing food in hydroponic pods, raising livestock, using 3D printers, desalination equipment for a water source.

I would like some of these cities to be more advanced than others because they discovered ways to make new infrastructure and technological advances while stuck underwater.

I'm not writing hard core science fiction but I don't want the infrastructure and technology to sound like complete fantasy. Is it possible for humans to build a completely sustainable city underwater if money was no issue?

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Plausible futuristic infrastructure for an underwater micronation built 300-500 feet below the surface

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