I'm playing on normal on a PS3 and I've had to restart two different chapters because I ran out of air. I read that on normal you never have any problem with air ...B.S.. Even the FAQs aren't accurate sending me on wasted time searchs. Is this a PS3 thing? I'm not having any problems with the game other than with the filters but it's really annoying and spoiling a lot of the game for me.