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This is for volunteering in an aquarium. The whole point is that you can assist someone to the edge of the tank where help is readily available. We're not talking about a 2 mile rescue in the Atlantic during storm season.Completely agree RJP - but on that basis you'd have to also repeat the exercise in every sea condition that you dive, also when you were a bit tired, a lot tired, a bit cold, etc.....
Allowances have to be made as sometimes the lesson is that you shouldn't even try... I know when I attempted mine it took a damn sight longer than the time allocated the first time but I'm not sure a boat would have done any better as the swell was huge.
"train the way you dive...." is a great catchphrase.