I have seen these RBs go through some real bad falls as well as get dropped off boats and recovered days later and still make it through fine. These cameras are built like tanks and take a real beating before dropping dead.
There are a couple internal foam seals that will hold moisture for a long time and that is where the trouble will most likely effect the camera. Changing them is no big deal but the camera has to completely opened and washed out as well as the shutter n lens, all seals have to be relaced.
If you'd like, I can do my best to recover it for you at a very reasonable price, e-mail me at email@example.com and we can discuss it further?
If you are trashing anything that can't be repaired, I will buy it for the parts?