'Underworld' in the Bible

"Son of man, mourn over the hordes of Egypt, and make her go down, [and] with her [the] daughters of mighty nations, {down to the deep underworld} with [the people] going down to [the] grave.

Elam [is] there and all of its hordes, all around its grave, all of them dead who fell by the sword, [those] who went down uncircumcised to [the] depths of [the] underworld, [those] who spread their terror to [the] land of [the] living, and [now] they bear their disgrace with [the people] going down [to the] grave.