I have my camera back! The two-three weeks during which it was away in repair at Nikon Canada I felt so naked, haha. And so of course not even a few days after having it back, I returned to the very river where I dropped it.... and put it in the water again (this time in a waterproof case)!!!
It was a good day with friends. I still have a lot I want to experiment with underwater photography, I guess it's a matter of finding the time and the right equipment to do it.