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I am a bit confused over this. What does SDI/TDI insurance have to do with Padi? Also can a child of 10 be a responsible buddy?
I agree that if the current raitios cause a higher incidence of accidents, then maybe the ratios SHOULD be changed?
With the lack of data fidelity provided I could argue that DSDs are the "most dangerous" statistically as they are often taught by the most junior member of the teaching staff. We need just a little more information behind the numbers as they say.