Your both arguing about non-issues.
The original navy rebreather tests were pure 02 units. They have tables that specify 20- 25' max operating depths. They also have "extreme exposure" tables that will allow short excursions down to 50'- I guess anytime your in a combat situation I would call it an extreme exposure.
The reason your heliox rebreather has a PO2 drop past 50m is to keep your toxicity levels in check. That is why you have a "mixed gas" rebreather- and not a pure 02 unit like the original tests were done on.
We know that the deep sled divers are going way into the toxic range, but seem to be safe due to their very short exposures at their target depth. Still, some are getting deep enough to get bent and I wonder how long it will be before someone gets deep enough to oxtox?
But back to your discussion at hand, it seems that your both right, but talking about totally different untis and circumstances.
Jon
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Imagination is intelligence with an erection. - Victor Hugo
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