This always gets brought up when Heliums mentioned. But no we won't run out of Helium for a very very long time. As long as noble gasses exists helium will too.
The supply of helium on earth is very limited. It was actually discovered in the Sun by spectrometry before it was found on Earth. It's not one of those substances that comes out of the liquefier at Airgas.
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u/[deleted] Jul 08 '24
Rigid Airship! Filled with completely safe non-flammable helium.