I call this one Busy Boats. I think the round structure is a reflection of the building on which the camera is mounted. That's my theory, anyway.

When I first saw the boats zipping along I thought they were miniature radio controlled boats. Sometimes scale is hard to tell on these cams. Today the video screen is going, though, and it looks like people are in them.

I see something else here , a huge round structure underwater, wonder what it is?

Cool, boat racing