> Helium would do just fine. Though that creates another problem: there is a shortage of Helium developing that is starting to cause concerts in a few places (

> Helium would do just fine. Though that creates another problem: there is a shortage of Helium developing that is starting to cause concerts in a few places (like medical imaging, which it is used as a coolant for devices like MRI scanners). That $8E6 might grow significantly not long after the first airships roll off the production line, and it'll raise for other users significantly too as available supply becomes more contested. > There's actually no need for hydrogen. The Hindenburg was originally designed with Helium in mind, but because of a US export ban (at the time Helium was in even shorter supply, and most of it was being produced from resources in the US) forced a redesign. Unless new practical+affordable sources are found, the same sort of design limitations could strike again.