I suspect he has his SMB pinched between his legs, giving some additional lift. I used to do this when waiting a long time for a boat.
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I This face down stuff is completely wrong. You just don't overinflate and lean back for a very comfortable position. If I was to be left adrift, I would probably eventually dump the weights from my pockets (the weights, not the pockets), adjust my buoyancy, and float around until I was picked up. I'm a patient guy, I know I'll be picked up
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I reckon that in either a wing or jacket, after staying afloat in it for hours I'm going to get uncomfortable. If my wetsuit can keep me afloat and the seas are calm, might as well remove the BCD for more comfort.This diver was using a wing and found himself adrift and filmed what he believed to be his last moments.
What I found interesting was that he had removed his equipment and was floating just in his neoprene and I wondered why he'd done this.