If you want to know about photographers, using equipment from MarinOptik, start with:

If you want to look at more beatiful underwater pictures, try:

If you want to look at other beatiful pictures, try these:

Here are some useful links, if you now are interested in medium format camera systems, suitable for underwater photography, of course with a fisheye lens included in the system:

Here are some links, if you want to look at equipment for underwater photography (mainly for 35 mm cameras, there is not much available for the medium format):

If you want to know the latest about photographic film, try: