Would it be possible to build a submarine-like city?

I mean as in a city that is not situated at the bottom of the ocean but is not floating on the surface of it either. What would a plausible size and population size be for this kind of construct? Could humans live in such an environment for their whole life? And how deep could such a thing be able to go? I know we(humans) are researching/developing ways to grow food in outer space, so could that technology be used in this as well? And if we can grow vegetables and/or fruit would it be possible for animals to live in the city as well?

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Would it be possible to build a submarine-like city?

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