belowground
submarine
submerged
submersed
subterranean
subterraneous
underground
undersea
underwater
ambient
atmospheric
boxlike
deep-sea
geologic
gravimetric
hydrologic
igneous
ink-jet
land-dwelling
localize
near-surface
nonmagnetic
permafrost
planetary
postural
seismic
superincumbent
tachyon
tertiary
uncharted