On Sep 28, 1:31*pm, Bill Grey wrote:
In message 200909281331238930-dplacourse@aolcom, David LaCourse
writes



Bruce said that we should blow out all the air as we rose to the
surface. He didn't say why. *It wasn't until years later that I
realized how dangerous this "diving bell" was.

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.

Air embolisms are nasty things.
--
Bill Grey

From a depth of twelve feet (assuming one started out in the prone
position on the lake/stream/sea bed) it would most certainly be unsafe
to rise to the surface at a pace any greater than mach 2. Anything
less than that......um......well, 863 mph still sounds pretty risky to
me, but I've grown somewhat averse to needless risk at my advanced
age. At any rate, no human being, relying simply on his or her own
inherent motive power could possibly surface from that depth at a
dangerous pace. And anything that could accelerate a human being to a
dangerous speed over a distance of twleve feet would kill him or her
with the acceleration.....that's the part that would be dangerous.

g.