abyssal zone(n = noun.object) - the deep sea (2000 meters or more) where there is no light;
is a kind of davy jones, davy jones's locker, ocean bottom, ocean floor, sea bottom, sea floor, seabed

abyssal, antarctic zone, arctic zone, bathyal zone, benthonic zone, canal zone, climatic zone, combat zone, comfort zone, danger zone, demilitarized zone, drop zone, dropping zone, enterprise zone, erogenous zone, free zone, frigid zone, geographical zone, kill zone, killing zone, language zone, littoral zone, loading zone, neritic zone, no-parking zone, north frigid zone, north temperate zone, panama canal zone, parking zone, polar zone, safety zone, south frigid zone, south temperate zone, strike zone, temperate zone, tidal zone, time zone, torrid zone, transit zone, transition zone, tropical zone, twilight zone, war zone, zone, zone fire, zone of interior