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I came across this instruction for using the Defense Position against entanglements and menaces in my old National Association of Skin Diving Schools (N.A.S.D.S.) textbook called Safe Scuba from 1971. My, how times have changed. I was just wondering how many of us have used this tactic and how often they practice or use it. I would imagine that the advent of the BC has made this technique more difficult to execute. Also, I think it may have been more useful in the days of Thunderball and other films.