The Effects of Hypoxia

[rjack]

I'm not saying you are wrong, but try as I may, I can't come up with a scenario for this other than some exotic mixture.

Top 2:
Isolator closed during mixing of trimix similar to Judi Bernard's (sp?) incident.
Use of a hypoxic trimix (e.g. 10/70) at <20ft depths.

[Merlin Rhoda]

I'm not saying you are wrong, but try as I may, I can't come up with a scenario for this other than some exotic mixture.

That depends on the definition of 'exotic'. Air breaks to back gas at 20' in Lake Tahoe on 10/70 make for a ppO2 of 0.138 - not the best choice. That's 20' / 34 ft per ata fresh water + 0.79 surface pressure * 10% fO2. We break to travel gas now.

I agree that it is much harder / less common to go hypoxic OC than than on a rebreather.

[Sludge]

Isolator closed during mixing of trimix similar to Judi Bernard's (sp?) incident.

That's not much different from stepping in front of a bus.

Use of a hypoxic trimix (e.g. 10/70) at <20ft depths.

I can't imagine using a 10% O2 mix without having all the protocols in place.

But I see the point - dumb mistakes can kill you on either configuration.

Never mind.

[graepaep]

That's not much different from stepping in front of a bus.



I can't imagine using a 10% O2 mix without having all the protocols in place.

But I see the point - dumb mistakes can kill you on either configuration.

Never mind.

Yeah my main thought was hypoxic mixes too shallow (whether it be improper gas switch or improper tank labeling and not analyzing).