> EvMick@aol.com wrote: > Hot hydrogen or a vacumn?
>
> Stirling Westrup wrote:
> Then again, by the time the weight of the displaced air was close that of
> your bathysphere, we're talking holding out some SERIOUS pressure. It
> looks like you'd want a diamondoid sheath in order to be practical at all.
Why all that? Just take some hydrogen down with you below the
hydrogen layer and match the hydrogen pressure in the baloon with the
pressure of the heavier gas you are displacing. Engineering-wise, the
problem is not all that different from building a blimp on this planet. Spike
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