Probably the least wild "wild swimming" ever

[Brick]

http://www.gizmag.com/plus-floating-...c-river/19010/

It's a hot summer day, you're sweaty and uncomfortable, and there's a river full of cool, clear water right beside you. Do you jump in? Not if you're in New York City, as the rivers that flow through that city are too polluted for swimming ... or at the very least, that's the perception that most people have of them. Three young entrepreneurs, however, have proposed a way of getting New Yorkers into the Hudson, East and/or Bronx Rivers. It's called the +Pool (Plus Pool) - a public swimming pool that would float in the river, allowing people to swim in filtered river water.

(My emphasis)