subsurface

Definitions of subsurface
1

adj beneath the surface

subsurface materials of the moon”
Synonyms:
belowground, underground
under the level of the ground
submarine, undersea
beneath the surface of the sea
submerged, submersed, underwater
beneath the surface of the water
subterranean, subterraneous
being or operating under the surface of the earth
Antonyms:
surface
on the surface
overhead
located or originating from above
aboveground
on or above the surface of the ground
grade-constructed
constructed at ground level
opencast, opencut
(of mines and mining) worked from the exposed surface
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