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The ClueDeep pit (5 letter answer)
NotesThe answer ABYSS is common and appears about once every 225 puzzles.
Hell, with "the"
1989 underwater thriller, with "The"
Tartarus, in Greek myth
DefinitionABYSS as a noun:
1. (abyss, abysm) = a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)