My photo was a reference to the cursed history of all attempts at commercializing rigid and semi-rigid airship transportation.
They've all failed for one reason or another.
Hydrogen is actually quite safe relative to public misperceptions but regulators won't let them use it. The Hindenburg disaster itself was caused not by some 'spark' that caused the hydrogen to go up but by the high flammability of the coatings on the support frames and the stuff the gas cells holding the hydrogen was made of -- both of which would NEVER be used in modern equivalents.
But the regulators still live in Lakehurst, New Jersey circa 1937.
Nice thing about hydrogen - it provides buoyancy AND can provide motive power via either fuel cells or an IC engine.