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Re the treading water: For the OW course I recall you weren't allowed to float. The 10 min. requirement was quite strenuous. But for DM I read that you can float, and even "fake drowning" (assume that means you can intentionally slip below the surface to rest?). This would seem to make the 15 mins. a piece of cake, even with the last 2 minutes hands out of the water. Any comments?
As for the tread,i am a sinker. I can sit on the bottom of the pool with a 3m suit on with all my gear off.