I found a GoPro Hero2 in the Arkansas tailwater this summer. It had been in the river since August 2012 and still works! I downloaded the card to see if I could find the owner, but there were just a few pics of college kids and chicks in bikinis on inner tubes, then a really funny video of the camera being dropped and sinking to the bottom of the river followed by 30 minutes of closeup of the gravel until the battery died. It travelled about a mile downstream of there to where I found it over the 3-year period...
Never argue with stupid people, they will drag you down to their level and beat you to death with experience. --Mark Twain
Some people just need a high five. In the face. With a chair.