Some popular cameras like Nikon P500, P510, P520, P100 and other ultra zoom compacts do not have underwater housings for them. The reason is that these cameras are zoom cameras and are not adequate for underwater photography, in addition , their lenses are long and make building a housing for them difficult.
Read more about why super zoom camera aren’t useful for underwater HERE.
If you are the owner of one of these cameras, you are most probably better off getting a new camera and housing bundle which you can solely use for underwater photography. A few very popular packages today are: