I was out in my pool (I don't just read TFP all day!) and had to take a picture. Where the drain is, that's 10' deep. You can clearly see not just the robot running, but the leaves in the pool that it's about to pick up, all the way from the front of the pool.
The discoloring in the plaster is because it is very old, somewhere between 1989 - 1991 and the pool was not properly maintained before we moved in. For example, the CH was almost zero. I had the $$$ to fix it last year, but my A/C went out. Maybe this winter!