Divers are taught that the amount of weight that they should wear on their weight belt should be sufficient that with their BCD (bouyancy control device) half full of air, and a full tank of air, they should float at approximately eye level in the water. This means that by venting the air from their BCD they will descend without needing to swim, and by putting additional air in, even with a full tank, they should float comfortably at the surface.
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