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Old 02-16-2022, 02:07 PM   #8 (permalink)
redpoint5
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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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