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I just watched a video on the subject. Hydrogen is only 7% the weight of air, so there's limited benefit to a vacuum over hydrogen from a buoyancy perspective.
I at least expected to find an example of a vacuum sphere being buoyant, but I didn't find any working examples.
A sphere is the strongest shape, but it isn't a requirement to avoid crushing. Submarines don't crush, and they aren't spheres.
The concept would require a breakthrough in materials technology though.
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