Found this on Nikon Rumors,
I don't think I would ever have the guts to do this...This "muddy" Nikon D3 picture was published on flickr. I contacted the photographer and this is his story:
"That was from one of my avian photography sorties. I use a floating blind to take photos of water birds but the water level that day was very low so I had to crawl it out in the mud to get the photos that I want. I was constantly pouring water on the LCD to take away the mud so I can view my photos. The lens installed on the body is a Nikkor 500 f/4 VR. After the shoot I cleaned the camera and placed it in my dry cabinet. It still works flawlessly: all seals worked, not a single grime inside the camera. Here are the shots from that day"
Read more on NikonRumors.com: http://nikonrumors.com/#ixzz1J5SeLBOA