For bodies, or anything close to neutral, the diver tends the lift. 
The procedure outlined below is for heavy objects.

-Sean


On Mon, 30 Aug 1999 14:46:25 -0400 (Eastern Daylight Time), Art
Greenberg wrote:

>On Fri, 27 Aug 1999, Sean T. Stevenson wrote:
>
>> For lifting large objects, fill your bags just enough to float them,
>> and make sure your bridle is secure.  Then establish a line from the
>> SURFACE to the bridle, instead of from the bottom.  Make the bags
>> slightly positive and have the surface take up the slack on their end,
>> via a cleat or capstan.  This way, if the bag dumps or ruptures, the
>> object will not sustain damage (or damage the site beneath) when it
>> falls to the bottom, but rather will just hang from the boat so you
>> can re-rig it.
>
>Sean,
>
>Do you also maintain a line from the bottom to the bag to control its
>ascent? Seems to me that without that a partially inflated bag will
>accelerate as it approaches the surface, potentiating the kind of damage
>(barotrauma) that you are working to avoid in some cases.
>
>-- 
>Art Greenberg
>artg@ec*.ne*
>
>
>
>
>
>
>
>


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