Hmmm... I often wondered about the martini effect and just realized something. Back in Sept., 1969, when I was heading to college my Dad made a pitcher of martinis and we sat out on the backyard deck so he could "teach" me how to drink. About 2:30 in the morning, after 2-3 pitchers, Mom yelled down from the bedroom "Bill, wake up your Dad and bring him up to bed... you have to be up in 5 hours to catch your flight." Well, when I started doing deep dives on air, down to a maximum depth of 200 fsw, I noticed I didn't feel much of an effect from the narcosis. I could function in a pretty clear headed manner (as long as I wasn't task loaded). I could locate, frame and follow subjects when I shot video at those depths. I guess the martini effect is a good example! Of course later on, when I wasn't doing much deep diving and not diving as regularly as I did earlier, I could get noticeably narced at depths as shallow as 107 fsw and whacked nearly out of my gourd at 151 fsw.