I only made the mistake of swimming in a crowded anchorage in the BVI's once. That is fucking disgusting. Some of the nastiest water I have ever seen is the AM at The Bight, Norman Island.I don't mind the plastic debris too much, but the open heads are just nerchy.Trash layer then? It isn't really much of a secret that the worlds oceans are getting more and more polluted. Anyones whos ever gone surfing or even left their boat in the water for a few days have seen the layer of scum that exists. Personally I would never want to be a diver doing bottoms in most marinas and yacht clubs. And have you ever seen a beach before it is combed or groomed every morning? Might make you think twice before you go jump in.
I once went swimming off the bow at my old dock (against better advice), a few hundred feet downstream from the Chelsea Piers Marina, which didn't offer a pump-out at the time. By the next day I contracted the most bizarre infection, everytime I hawked a loogie it was nearly the color of day-glow green slime. That was just one swim ... do these marina divers build up an immunity after a few months of swimming in dilute sewage?
They charge about $100 for a 30-foot boat, waterline to keel, I guess they're not starving, but it's a tough way to make a living.