[Paddlewise] snorkeling while still in a kayak

I had taken a basic kayaking class a few weeks ago, and managed to get in 
five somewhat sloppy C to C rolls. I mentioned to someone outside the class 
that it was just as much fun hanging upside down in the kayak and just 
looking around the pool, before trying to come back upright (actually I 
spent more time hanging upside down than coming back upright). He mentioned 
that he saw someone once that would use a mask, and had some sort of snorkel 
rigged to the side of the kayak, and would paddle out and invert at an 
interesting spot.

I don't know if this was to scout out an interesting spot to snorkel, if he 
would regularly snorkel while still in the kayak, or if the person telling 
me this was pulling my leg.

Which is it, has anyone heard of such a thing?

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