trimix

[Chris H]

sounds interesting actually. how does this work? you bleed he into a bag and run it back in thru intake?
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A lot of places are likely not getting Helium because of the cost. In many cases there have been allocations and in some cases if there isn't a contract, the suppliers won't sell helium to "small" customers. Availability is likely going to go down and costs are likely going to go up. Buy a rebreather. Deep air isn't cool.