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buoyancy of the extra lead is constant regardless of depth, while the buoyancy of the air you put into your BC to support that lead varies with depth. The two are always getting out of balance.   Say you're five pounds heavy. At 40

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your best guess of how much lead you need. Float around and relax-after a few minutes, you'll have tamed all unnecessary movement and you'll be holding less air in your lungs. Now add or subtract lead in small increments until you float with a

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