Well, that obviously depends on the recipe and amount of alcohol.
A quick search of the web says pure alcohol is like 0.800 or 0.792 (I assume the 0.800 is a rounding).
Assuming nothing but water and alcohol are the only gravity components (I'm sure they're not, but for ease of calculation).
Assuming you're making a mead where 15% of the content is alcohol, then theoretically you could be sitting at 0.969 (15% @ 0.792, 85% at 1.000)
That said, that's where those "other" things come into play, I don't think it's possible to actually get down that low with a standard recipe, but would be what you would get if you blended 15% pure alcohol and 85% water.
Does that math look right to the rest of you???