-- Last Updated: Jun-12-12 9:38 AM EST --
depends on the body composition. A low body fat % person will tend to be slightly positively bouyant when completely relaxed in the water. A person with a high body fat% will be quite positively bouyant. I had a scuba student that required 14 lbs of lead weights strapped around her waist to get her close enough to slightly positively bouyant so she could complete a breath hold swim the length of the pool. As she described her self, "I'm fluffy" i.e. really high body fat %. She became a pretty good diver.