you couldn't pay me to tube in the ocean. i have a tube and it stays in freshwater!they say you have a greater chance of getting struck by lighting than being attacked by a shark. that may be true, but i have never seen anyone stay outside during a lightning storm purposely. i wouldn't worry about greatwhites that much if i was a sw tuber, but i would be more concerned about those damn seals and sharks that frequent close to shore. the seals would probably just be pissed out at you and deceide to tell you to leave. the sharks would probably take a chunk out of your leg not knowing what you are.
even though i might not be concidered dinner, that is more broken flesh than i would want to be subjected to!!