depths

basement bed floor ground seat underside

base basis bedrock foot footing groundwork nadir pedestal pediment rest substratum substructure support underbelly

deepest part lowest part nether portion terra firma underneath

ceiling

top

exteriority outside

belly core deep entrails guts hold innards interior intestines penetralia recesses viscera vitals

exterior exteriority outside

abyss breach cave cavity chasm cleft crevasse depth distance expanse gap gulch hiatus hollow opening pit ravine rent rift separation shaft split void well whirlpool

closing closure juncture solid

bosom center deep heart hub interior mean medium midpoint nucleus thick

betwixt and between halfway

exterior exteriority outside periphery

alcove ambush angle apse bay break carrel cavity cell closet cove cranny crutch crypt cubicle dent depression embrasure fork heart hole hollow indentation mouth nook opening oriel penetralia reaches retreat slot socket

hiding place secret place

bulge closure misfortune solid

continuation

nadir

all-time low base bedrock record low solid bottom solid rock

base basement basis bed bedrock belly floor foot footing ground groundwork nadir pedestal pediment rest seat sole substratum substructure support underbelly underside

deepest part lowest part nether portion terra firma underneath

annex ceiling top