Has it occurred to anyone that we have absolutely no credible information that this particular instructor is, in fact, a diabetic, and that it may well be slander (and is at the very least extremely unfair) to continue to discuss this as fact when it may not be?
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As a physician, I am not at all sure that all diabetes is a complete contraindication to overhead diving, or perhaps even to teaching. Diabetes is a disease with a very wide spectrum of manifestations, ranging from mild blood sugar elevations to life-threatening ketoacidosis. Anyone with a history of significant hypoglycemia or whose glycemic control is brittle shouldn't be diving, period, let alone in an overhead. But there are a lot of folks with mild glucose elevations who are on mild medications like metformin, and probably don't present any greater risk underwater than the average, overweight smoker in his 50's (which matches a lot of the folks I saw cave diving in Florida!)
BTW, I agree with Harry -- unresponsive and not breathing in a cave? I park you for the recovery divers. Breathing is a whole different story.
I agree with Lynne.
Is there any hard or first hand evidence that this instructor has contraindications to teaching? Or is it mostly my buddy heard from his cousin type stuff?
Responsibility swings both ways. I think we have a responsibility to call unsafe practices to light, but at the same time we have a responsibility to make sure we're repeating factual information as well.