Right now when I am at the co2 scrubber the oxygen won't completely refil. Multiple attempts made too close together lead to instant afixiation. That is a little ridiculous. It isn't a good mechanic to simulate realism and is a bit cartoonish. Depressurization causing that works, but this is helmet on, and indoors, and trying to do something that shouldn't be a problem doing one and done is a bit obtuse. There really is no reason a lack of oxygen leads to instant death. It is a bit irratating that wonky mechanics lead so easily to having to restart to your last save.
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