There’s a scene in the second half of the Peabody Award-winning French TV show The Returned (Les Revenants) where two characters are swimming across a reservoir. One cries out and disappears. The other dives under the surface and searches for him, but with no luck. Eventually, he gives up. The first person is gone, apparently without a trace.
Give or take a few traces (a body, say), this is how death is supposed to work, particularly if you don’t believe in an afterlife: you swim along and someone around you disappears. Then the water closes over them and life goes on, until it doesn’t. And even if you do believe in an afterlife, you do not expect the sudden resurfacing of your lost companion to be any time soon.