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This I am fairly certain we do not have the technology to achieve. Anything vacuum filled that large would need to have walls so thick so as to completely negate any buoyancy effect. I don’t know of any modern material that would simultaneously be rigid, strong, and light enough.
Cool sci-fi concept tho
What other sorts of random issues would be solved by this super material :opens notepad: I mean, everything, right? It would have to be so strong, so light and so economical. You could make actual BattleMechs from it that wouldn’t just sink into every surface they walk on. Shit, Dyson Spheres I guess.
…so why would we use weird balloon floaties? Isn’t it fun how technology answers it’s own questions?