Looks like a beluga whale to me, which would be odd since they are arctic creatures, but three were spotted off New Jersey this past summer, so one could have
easily possibly made it down to the Mediterranean.
That thing sticking out of the water is its fin, and the head is down in the water and sideways to the camera, and it is bent so the body isn't seen as it tapers off behind it. And that black eyeball is the shadow of a bubble. The water also helps distort it like crazy.
