I tried to watch it, but it keeps timing out trying to buffer. And I'm a Comcast subscriber. Netflix streaming eats their lunch. But anyway, two things Al mentioned... sand on the bottom is pretty silty and the top layers are water saturated. Stirs up very easily, but if you press down into it you don't sink that far. And yeah, there is lots of coastal barge traffic. I worked two summers on a tug that pushed barley, oil, corn, and fertilizer up and down the east coast. Spent many a night waiting off AC, pitching and rolling, for some late NYC boat to come down and take our barges north. It's like a maritime highway out there.