奈落

(1)any place of pain and turmoil; "the hell of battle"; "the inferno of the engine room"; "when you're alone Christmas is the pits";

(2)苦悩と騒乱の場所

(3)a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)

(4)底無しの湾か穴

(5)底知れぬ（または、一見底知れぬ）穴、裂け目、または、空洞で、下に広がる（時に比ゆ的に）もの