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DiverBuoy once boasted...
Of all courses through DM ... none is even close to the mental, emotional, and physical challenge of DM! Rescue is a very distant second.
Consider this: The entire rescue course is pretty much a chapter in the dm course.. you live it all over again as merely a sub-component of your DM course ... so how could the two even be compared?
Physical challenge ha! Concerned with egressing a victim to shore? Consider exchanging all of your gear from head to toe at the bottom of a swimming pool while buddy breathing having just swam 1600 meters in under 10 minutes and treading water the last 2 minutes with arms raised fully over your head. Just pray the two of you don't run out of air while getting the job done!