[neontomo]

While your reply is interesting to me, what I actually was asking was, "if these people died in circumstances that did NOT involve a car, but in the water, would the bodies have been found eventually because they float to the surface?"

[recursivecaveat]

Apparently bodies sink initially, float temporarily for a while due to bloating, then return to the bottom again after some decomposition. So you could easily miss the window if there are not good conditions to beach it I guess?