Hi azapa,
as far as i know the an inflating vest would not work/provide enough lift from the depths that are now being reached. The counter weight seemed to be the safest option thus far the biggest downside to it possibly being caught in currents or flotsam etc and getting snagged so i.m not sure would your boat idea work as it may pull the diver horizontally rather than vertically. Maybe a superfast winch on a large boat will be the only way in the future that swings out prouud of the boat. with the declining fish stocks there may be a few of these on the market at reasonable prices in the future.
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