I didn't notice the ufo until I reviewed vacation photos We were on vacation, swimming with dolphins. We took many photos during this time and non had any artifacts. I've uploaded 3 photos. The first is includes the UFO, above the dolphin. The second was taken 1 second later and the 3rd is a zoomed in version of the first photo. Doesn't appear to be a bug (there were no bugs there) and the shape is too perfect to be anything else I can think of.