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Date: Mon, 22 Jan 1996 13:34:30 -0800 (PST)
From: Mike Cochran <mcochran@ne*.co*>
Subject: Rebreathers
To: techdiver@terra.net
cc: rchambers@su*.ne*

You wrote:
>I'm new to this mailing list.
>I'm looking for a reliable rebreather able to reach at least 220' for
snip

A rebreather operating in closed circuit can give you more bottom time 
below 220' than the human body can allow unless you're doing saturation 
diving.  You'll need helium for any reasonable SAFE bottom times below 
220' but watch out for your decompression time.

For your photography, semiclosed gives a few bubbles all the time, closed 
circuit vents bubbles only on ascent.  I have dove the PRISM II, and it's 
an incredible experience.  Lay very still on the bottom and all you hear 
is your own breathing and heartbeat.  You don't even hear any clicking 
solenoids.

Mike C.

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