My daughter and I are scheduled to take our last 2 dives this weekend to get our open water certificate. We live in Port Orange, just south of Daytona & north of New Symrna. After hearing about what happened my wife is scared to death that something like this will happen to us. I must admit I am a little concerned too. What would cause him to sink after he already surfaced? Is it possible that he ran out of air, made it to the surface but then was unable to manually inflate his BCD before he sank? My heartfelt condolences to his family.