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Date: Fri, 15 Mar 1996 11:56:21 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: IchthyoSapien <goettg@rp*.ed*>
Cc: techdiver@terra.net, freeattic@co*.ci*.uf*.ed*
Subject: Re: Oxygen Decompression (cave diving)


> i think that for cave divers who decompress in calm water, using pure O2
> at the 20 foot stop is not a problem.  in the open ocean, however, with
> it's swells, you can be at 20fsw, then at 10fsw, then at 30 fsw within a
> few moments.

This is only a problem when the deco line is attached to the boat 
(particularly a large boat).  If the deco line hangs from a float (as 
it is done in drift-decompression situations -- whether or not the float is 
secondarily attached to the boat) then the divers move up and down 
relative to the sea surface, and ambient pressure doesn't vary by more 
than the equivalent of a couple of feet of water.

Aloha,
Rich

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