belowground
abstruse
beclouded
blind
close
clouded
concealed
covered
covert
deep-buried
drowned
eclipsed
engulfed
flooded
guarded
hid
hidden
immersed
in a cloud
in a fog
in eclipse
in purdah
in the wings
incommunicado
inundated
latent
mysterious
obfuscated
obscure
obscured
occult
privy
recondite
secluded
secluse
secret
sequestered
shrouded
subaqueous
submarine
submerged
submersed
subterranean
subterraneous
sunken
under an eclipse
under cover
under house arrest
under wraps
underground
carried
ferried
harried
married
parried
remarried
unmarried
varied