Oh, now I see. From the last post I thought there was a man in the water swimming beside it :) Now it's clear that's it's being towed, I'm not so worried about the swimmer!! Interesting round structures in the background.
You will be led to the knowledge of the internal things which are invisible to you, by the external things which you see before you. . . . Even so then, we can represent to ourselves in thought the Author of all that is, by contemplating and admiring the (visible) things which He has made, and ever brings into being.
- Hermes