My main camera body is a Nikon D800. It’s a full frame camera which allows me to take full advantage of wide angle lenses.
For underwater photography an Ikelite housing is used together with two DS51 strobes
My second body is the FujiFilm X-H1 for which I have the 10-24mm, 27 mm, 35 mm and 55-200mm lenses.
My third body is a FujiFilm X-Pro1 with the same lenses as the X-H1 and an adapter for Nikon lenses.
And for when I am unable to carry much weight I have my Nikon 1 V1 with 6,7-13mm and 10-30mm lenses.