Another aspect that leads me to believe hypoxia is at the root of this, is that the first thing that goes is conscious reasoning etc. That makes doing an ascent that would be required and having presence of mind to close DSV etc problematic. Might also lead to someone giving an OK when he isn't.
Seen enough guys in a chamber going loopy (hell, been that guy) to find it credible.
Seen enough guys in a chamber going loopy (hell, been that guy) to find it credible.