Here is a possible answer from something I just happened upon. It sounds almost reasonable.
There is a guy here in Vancouver who has been on the radio and who lost his brother in a plane crash along with several passengers. The plane went down somewhere off the coast of Vancouver and is, obviously, underwater. This was some months ago. He has been dragging the ocean trying to recover the plane and his brother's body and he thinks he has dislodged the bodies and the feet have detached due to decomposition. The feet have come to the surface because shoes float.