It's been possible to parse the difference in nuance between the various words used to refer to the afterlife, which corresponds to the interior of the Earth, because we have an absolute frame of reference.
Down to the Pit, The Lowest Hell
Graves and Pits
One of the repercussions of the fall of man was the start of nuclear decay. This in turn is the beginning of hell, since the explosive rate of decay, concentrated in the core of the Earth, caused the core to melt.