1) Compressibility - a wetsuit made from closed cell nitrogen blown
neoprene will compress and lose some of its buoyancy at depth.  This
means you need to wear additional weight at the surface to offset the
buoyancy of the suit, and then inflate your BC to compensate for the
loss of buoyancy at depth, which increases your drag.
2) Backup buoyancy - A wetsuit does not provide variable backup
bouyancy like a drysuit, and so must be worn with a weight belt to get
you up in an emergency.  By using a drysuit, you lose the possibility
of accidentally losing the belt and blowing up, as well as being able
to adjust your buoyancy in the case of wing failure.
3) Thermal - A wetsuit does not inhibit heat loss as well as a drysuit
- regardless of the water temperature.  You will notice this on a long
exposure dive.  The insulating value of the wetsuit also decreases at
depth due to the compression.

-Sean


On Thu, 13 May 1999 13:02:31 -0400, Charles McDonald wrote:

>Message text written by "Sean T. Stevenson"
>>  In
>the case of deco diving in a wetsuit (IMO a bad idea, but
>nevertheless...),<
>
>May I ask why you feel deco diving in a wetsuit is a bad idea? Perhaps this
>is just for 
>particular parts of the world?
>
>Charles
>
>- A newby to techdiver and relatively new to technical diving. 
>--
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