I spent two hours trying to SWB in the bath this morning. I don't think I got anywhere near passing out. I hyperventilated first, then laid face down in the water, resisting the urge to breathe for as long as possible. When I gave up and lifted my head out of the water, I tried again. I was able to stay submerged for longer than I thought on some attempts, but not long enough. I did doze off a couple of times while I was hyperventilating which was a bit annoying - why couldn't I have done that while I was submerged? I did fart in the water a few times as well - I thought that the SWB doesn't seem to be working, so perhaps I could gas myself instead, but no such luck! I think some practice hyperventilating is in order, although I am about to be made homeless, so I don't know when I will have access to a bath again. I suggest practising hyperventilating until you can pass out before you attempt SWB.