On Mon, 10 Aug 1998, Kerry Prouten wrote: > And I would have to say I think > it would be an ambient pressure. > AFAICT, if this is what you want, even 1/4" would be a bit on the excessive side. Though, if you're going to pilot an ambient pressure sub it's almost a necessity to have SCUBA training. TTYL! --- Paul Anderson hacker@geeky1.ebtech.net "This is Maurice, our sheep-hearding carrot."