Friend that is an interesting questing, since I believe that few things are actually impossible I suppose with a large enough incentive it could be done but not without some help.

A woman did swim from Cuba to Florida and from the point of Rhode Island closest to NYC to NYC is about 120 Miles I guess it would be possible and from RI to the nearest tip of Long Island would be a lot closer.

And Block Island to Long Island is about 14 miles.

By the way what made you ask that question?

If it was the Whales that are swimming around NYC I assure you it was not me. I may be over weight but I am not that big.

I did used to joke about not Wearing a Black Wet Suit since I didn't want to be mistaken for a Whale and get Harpooned.