I live near Ipanema beach and we see helicopters pull people out of the water all of the time. I have two people I know get pulled out this way, one of which I got the life guards to go get him. The lifeguards must do ones that we don't see. The helicopter ones are pretty obvious from a distance so they stand out. Probably 3-7 a week during the few months of summer.
But this beach is busy. There must be a 100k people a day on the beach so the percent that get in trouble is really small.
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