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I think that's the advantage of hydrogen.

I'm not sure it would meaningfully impact hydrogen prices if we had widespread hydrogen ships.

For example, you can generate fairly pure hydrogen on-demand by passing electricity through water. Hydrogen is abundant and can be generated on-demand with low-tech tools from any water source.

It won't impact helium prices. Almost no helium is used for airships today. Most goes for industrial and cooling systems.

As a fellow diver, open circuit helium mix diving is probably not going to be sustainable. We'll probably all have to switch to rebreathers soon.

Doesn’t helium leak out of all containers? Ie there might not be much left if your retirement is a long way away.

reddit suggests not, unless the valve is compromised:

https://old.reddit.com/r/AskEngineers/comments/3eqnqo/will_h...

What is a “double”?

sorry, double scuba tanks, this kind of thing:

https://www.johnchatterton.com/wp-content/uploads/2013/03/cr...