> Since we always choose the lightest / least dense possible lifting gas, would it be possibly to use a pure vacuum as a lifting gas? You'd need an insanely str

> Since we always choose the lightest / least dense possible lifting gas, would it be possibly to use a pure vacuum as a lifting gas? You'd need an insanely strong cover and internal structure, but would it theoretically work? Theoretically, but you'd be incentivized to cut weight as much as possible in the pressure vessel department... might as well put OceanGate logos on the control surfaces.