Reducing the amount of narcotic gases in your mix so you don't act like a drunk idiot when in a life threatening situation.

Those narcotic gases are nitrogen and oxygen (although there's only so little oxygen you can have....and also only so much!)

Edit: extra info: oxygen and nitrogen are narcotic at depth, nitrogen is better understood and so often we talk about nitrogen narcosis, which tends to start hitting people after about 30m, but each person reacts different and to different degrees at different deaths. I personally notice it at about 50m or so. If I was more relaxed while diving it'd probably hit me sooner.

The thing with helium though is that it's already privatized. The geologic formations that trap helium from uranium and thorium decay are the exact formations that trap fossil fuels, particularly natural gas. Whether it's worth it to capture that helium is purely market driven by private interests. Most of it is just off gassed into space instead of separated. All that government production has amounted to is making helium cheap enough to put in balloons and use on wasteful cryo applications with no recovery mechanism like it was subsidized, making separating it from natural gas uneconomical. Increasing the price would decrease the monumental waste we already do.

https://pubs.aip.org/physicstoday/article/60/12/10/413018/Helium-scarcity-blamed-on-waste

Seems more like a gender reveal party sort of thing.

https://www.cnn.com/2021/04/23/us/gender-reveal-explosion-new-hampshire-trnd/index.html

^(The^ ^store^ ^was^ ^just^ ^out^ ^of^ ^helium.)^

When I was a kid, Dave Berry had a column where he made fun of the US Strategic Helium Reserve. This taught me an important lesson: when people make fun of what seems like government waste, 75% of the time it turns out to be really important. Not always, but you should look into it more.

Specific airships made by a specific country that had no access to helium...

"I̡̖̝͔̯͌̄̈́ ̧̙̮̈̈́H̥̫̭͈̖̐̆̒̂̓̾A̼͚̘̦̼͂͌̇͒̏̌͝Ṽ̡̡͙͙͌́̽Ȩ̮̝̪̞͖̍͆̋͋̄̒͝ͅ ̳̙͝R̥͕̱̠̱̈̈́͜I͎͒͌̋͗̈̑͜͝S̨͙̻͍̺̟̾Ẹ̳̖̖̼̥̊̓̆Ǹ̡̳͍̏͒͛̉̃̀,̳̅̋͑ ̡̡̠̗͈́͑̌A̡̧̛̦͛̅̎̄͒͂Ṅ̨͕͈͍͎͆̑̕D̻̑̾̔̊̉͊̚ͅ ̧̳̙̳͗̈́͊͊̓͝Ḭ̻̗̻̥̙͉̀̒̂͛̈́ ̢̡̯͖̩̻͍͛D̰͔͇͉̪̆E̛̝̻͇͚̼̤͗̊̑̀͋͜M͕̯̠͎̳͌͛͐͒̋͑Ä̹̺̥̤́̓̾̕N̝͎̓̓̆͋͐D͇̺̮̠̏͊̌͐̍̚͠.͓̼̰̈́͛̈̈͊.̺͎͖̰͔̻̇̂̉̈́̌.̢̮̣͖̳͖̜́͌ ̫̰̗͋P͔͗̑͆O̳͛͌̂̎̀Ṅ̦̣͖̭Ḭ̱̖̊̂Ė̛̠̺̭̓̉Ś̞͔͍̠̟͓̦̿̈́̆"

The Eldritch God of over eccentric suburban moms is somehow more terrifying than anything Lovecraft came up with.