Also, humans cannot detect O2 levels, we detect CO2 levels. When you supersaturate your blood with O2, you're also purging CO2 levels. This can result in you ho

Also, humans cannot detect O2 levels, we detect CO2 levels. When you supersaturate your blood with O2, you're also purging CO2 levels. This can result in you holding your breath beyond the point where your O2 levels drop below the blackout threshold, which is typically a fatal experience if you're underwater when it happens.