Dave wrote:
On Sun, 26 Feb 2006 22:44:21 GMT, Gary said:


Your body is predominately made of water. Water is almost entirely
non-compressible. That means that the pressure exerted by the sea is
transmitted through all of the non-compressible parts of your body to your
lungs and throat, which contain air that is compressible. So as you descend,
all of the air in your body gets compressed to the outside pressure.



So you are trying to convince me that me chest compresses enough to make
the air in my lungs double in pressure and I don't feel it. I only feel
the same thing happening in my ears? Your saying that the 6 litres of
air in my lungs is compressed down to three litres at 33 feet (making it
ambient pressure) and then I can somehow force it into my ears to equalize?

Right.


I guess you either didn't read, didn't comprehend, or didn't want to quote
the paragraph that followed the one you quoted. (See the part about the
diaphragm)

Frankly, I don't care whether you want to believe what I'm telling you or
not. Hell, I only had undergraduate minors in physics and math, not a major,
before going to the Navy's diving school.
I just spent a little time researching freediving. You are right.
Expert freedivers can force air into their ears to relieve the pressure
as they descend. It is what limits them from greater descents but they
can force what little air they have (at depth) into their ears to
relieve the pressure...... somewhat.

You win.