A hunter may have been trespassing on someone's property, the property owner found it and promptly sent it overboard into the water ! Every now and then, we will find a stand on my brothers 240 acres, take it down, cut it into pieces and leave it lay at the base of the tree for a year or so. That way they have plenty of time to come back and get the hint, that they should not be there without permission. Trespassers in any sport or hobby beware ! And yes, I have been a deer hunter for 35 years.