On 2009-09-28 14:31:30 -0400, Bill Grey said:

Yes indeed a simple mistake for the uninitiated but with possible long
lasting consequences. *The trick would have been to surface no faster
than your bubbles assuming you were breathing out.

Reminds me of my one day in "The Tower" in Groton, CT. Those of you
who've watched the show(s) about Navy Sub School know exactly what I'm
talking about.