... are people in their 50s and 60s. I'm in that age group, but I quit diving years ago since the reef is dead and it's nothing but sad to see if you ever saw it before its demise. Maybe at our age many of us have undetected underlying health problems that tend to become known in a tragic way in the briny deep. At any rate, dive operators ought to concern themselves with stressing that the risk of dying while diving is heightened above 50, and perhaps operators, if not the certifying organizations, should require more stringent physical exams. I remember my "dive physical" very well. For five dollars, a very, very retired KW doctor who shall remain nameless, sitting in a wheelchair, asked me if I felt OK. That was the entire physical, I kid you not.