Scuba isn't the only industry being affected by the helium shortage

[Gone for diving]

but it can't have more than 4%

This sounds correct from what I remember reading..

The other stuff is probably correct as well.

But there was a guy way back, that made tables for hydrogen. And he went very deep in the day... but his tenders accidently dumped him off the stage he was on and died.... something along those lines...
I'll have to go digging...

 

[Wibble]

Has anyone the narcosis figures for hydrogen to hand? i.e. compared with helium

 

[greeniguana]

Helium shortage disrupts celebrations – and US weather service

Supply chain disruptions, including production plant closures and the 2017 embargo on Qatar, have caused shortage

www.theguardian.com

 

[boulderjohn]

Helium shortage disrupts celebrations – and US weather service

Supply chain disruptions, including production plant closures and the 2017 embargo on Qatar, have caused shortage

www.theguardian.com

I have not been able to get any helium for the last two months. I have only been able to do one dive weekend, using old stores of gas, and I may well have to cancel the next scheduled trip.

 

[macado]

I just stocked up on O2 but my gas supplier tells me they can't get helium and to check back in late June or early July. My summer is looking grim if I can't get anything. I still have some banked 18/45 but no 10/70. :-(