Pictures Of Sailboat Crash I Saw Pictures Of A Cute Little Sailboat That Doesn't Have A Back End . What's That All About?

I saw pictures of a cute little sailboat that doesn't have a back end . What's that all about? - pictures of sailboat crash

The other side looks like a regular boat surrounded by a wall. On the back there are small walls. Single cover. At first I thought it was cut to show a cross section of the boat, but it really looks like. How can you swim without filling with water?