For a fire is kindled in mine anger, and shall burn unto the lowest hell, and shall consume the earth with her increase, and set on fire the foundations of the mountains.
( Deuteronomy 32:22 )
The pit, the pit of corruption, and the lowest hell are the same thing: the molten core of the earth from which there is no return. The grave, on the other hand, in the mantle, you can be brought up from.
Principia Mattymatica 