Markus Thompson had been diving Vancouver, British Columbia when he came across the submerged Canon EOS 1000D camera.
Despite the apparent state of the camera, Thompson was able to recover 50 images of a family vacation from the memory card.
He then posted the images on his Google+ page and asked if any one knew the people in them so that he could return the camera and their photos. And they did.
He will now get the camera back, though unsurprisingly, it no longer works.