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bathyal zone
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bottomless depths
box canyon
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cavity
chap
chasm
check
chimney
chink
cleft
cleuch
clough
col
coulee
couloir
crack
cranny
crater
crevasse
crevice
cut
cwm
deep
deepness
defile
dell
depth
dig
diggings
dike
ditch
donga
draw
excavation
fault
fissure
flaw
flume
fracture
furrow
gap
gape
gash
gorge
groove
ground
gulch
gulf
gully
hades
hole
hollow
incision
inferno
inner space
joint
kloof
leak
mine
moat
netherworld
notch
nullah
ocean bottom
ocean depths
ocean floor
opening
pass
passage
pelagic zone
perdition
pit
profoundness
profundity
quarry
ravine
rent
rift
rime
rupture
scissure
seam
shaft
slit
slot
split
the deep
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trench
underworld
valley
void
wadi
well
workings
yawning abyss
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