Synonyms to unknown depths

bottomless pit, Abaddon, Gehenna, Hades, Naraka, Pandemonium, Sheol, Tophet, avichi, bowels, deep space, deeps, depths, gaping depths, hell, infernal pit, infernal regions, inferno, jahannan, limbo, lower world, nether world, outer space, perdition, place of torment, purgatory, shades below, the abyss, the bottomless pit, the grave, the pit, underworld, unfathomed deeps, abdomen, anus, appendix, belly, blind gut, brain, cecum, colon, core, duodenum, endocardium, entrails, foregut, giblets, gizzard, gut, guts, heart, hindgut, innards, inner mechanism, insides, interior, internals, intestine, intestines, inwards, jejunum, kidney, kishkes, large intestine, liver, liver and lights, lung, midgut, perineum, pump, pylorus, rectum, small intestine, spleen, stomach, ticker, tripes, vermiform appendix, viscera, vitals, works, Acheron, Babel, Dis, Erebus, Styx, Tartarus, Torrid Zone, abyss, afflict