Re: [PSUBS-MAILIST] Ambient subs

[Ray Keefer <Ray.Keefer@Sun.COM>]

Hi Greg,

There are really only three areas of comfort to be considered. 

Temperature

	For a dry ambient just keep dry and dress warm. For a wet or semi-dry
	ambient you may need a wet/dry suit to keep warm. You can get
	cold in even 80F water.

Equalization

	The is the biggest discomfort factor with ambient pressure is
	with equalization.
	 
	Most of your body is uncompressable matter, bone, muscle,
	sineu, blood (a liquid)... These areas do not feel the greater
	pressure at depth since it squezes in equally from all sides.
	Every thing balances out and feels fine.
	
	Your air spaces however try to compress unless you equalize them.
	By equalizing them I mean you bring the bodies internal air spaces,
	lungs, ears, echution (sp?) tubes, sinuses and sometimes fillings
	in your teeth. to the same pressure as the ambient pressure 
	around you. If you don't do this then even a depth change 
	small as five feet can make your ear drums hurt.
	
	The effect is most prominent as you decend as opposed to surfacing
	and having a cold or sinus congestion worsens the effects.
	
	If you submerge gradually and breath normally you may naturally
	equalize. However if the pressure differential does build you can
	try, chewing (gum or regulator mouth piece), swallow,  pull on
	your ear lobes and wiggle your jaw. If they don't work then ascend
	until the pressure differential is bareable and then try clearing
	again. At some point you should feel a pop as the inner ear equalizes.
	Much like if you are driving down off a mountain pass and your ears
	pop. That is your ears equalizing. 

Vision

	In a dry sub. No problem. In a wet sub then you need a mask to see. 
	When using a mask, if you breath in and out of your mouth then 
	as you decend the pressure differential between the ambient water
	pressure and the pressure inside the mask increases. This is called
	"mask squeeze". You come up looking like you had a giant squid 
	sucker on your face. O) The solution is to breath out your nose
	occasionally. Not too much or you will fog your mask but enough to
	equalize it. Don't worry about over equallizing it or ascending because
	the excess air pressure in side the mask will escape between the
	mask skirt and your face.

Regards,
Ray

> From: "Greg Snyder" <snyde032@tc.umn.edu>
> To: <personal_submersibles@psubs.org>
> Subject: [PSUBS-MAILIST] Ambient subs
> Date: Wed, 27 Feb 2002 21:39:14 -0600
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> Hi Folks -
> I have tried submitting this post before, but I never saw it go through.
> I am looking at an ambient sub, but my question is this:
> Is it uncomfortable to dive to 60 or 125 feet in the sub, i.e. does the
> increased pressure make the trip unpleasant.  I have been diving (Snorkel)
> to about 15 feet, and it always seems uncomfortable - What is the deal with
> going deeper?
> Thanks-
> Greg
> 
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Carsten
> Standfuß
> Sent: Wednesday, February 27, 2002 9:57 AM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Remember
> 
> 
> Remember I am not a christ - so for me the Ark never exist ..
> 
> The Titanic was designed by professionals with places in rescueboats
> for each soul on board - the busisness mans descided that that are to
> much
> waste space - passengers paid for cabin space - not for rescue places..
> and keep the half of the rescueboat places out of the plans..
> 
> Today passenger ships have about half rescue space in boats and half in
> life rafts - and all the profesionals know's that the life rafts
> give you no chance - under the most seaconditions..
> 
> Carsten - naval engineer
> 
> > vikking schrieb:
> >
> > Remember, the Ark was built by amateurs; the Titanic by professionals
>