There may be that custom. Also, I think, in at least 1 cave maybe in the tv series, or a movie, there is a skeleton of maybe a swimmer in a cave near the Great Valley so if some do this, then maybe that one didn't quite make it. I think the Eskimos use to have that custom. That old folks, once they got to a certain age or health, I don't recall the details, that they would leave the community, though I don't recall the details since I read that a long time ago.