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- I just don't log dives
For the dry suit:
Not if you have the weight on the belt or ditchable on the BC.
Mordern shell suit is slightly negative, neoprene is positive. Flooded undergarment will be neutral. So if you have the ditchable weights on the belt or bc you just ditch it. 20 lb will be more than enough to float the gas in a single tank and the diver.
Huh? What happened to all the lead you were carrying to sink that undergarment before it became soaked. That is what you are compensating for if the suit fails. I would prefer not to "just ditch it" at 100' and rocket to the surface if, say you cut a hole in the suit on a wreck or something.
That 20 pound wing needs to be able to make you positive with all the equipment and the lead you were carrying to be close to neutral before the suit failed. It also needs to be able to float your gear and all the weight connected to the bcd if you take it off.