ADJ.
lay, liquid, liquid, under
VERB + SUBSURFACE
thought
SUBSURFACE + NOUN
conditions, ocean, water
PREP.
in
noun
Something that is below the layer that is on the surface.
Before we could lay the flooring we had to lay a subsurface under it to keep it flat and support it.
A surface which is a submanifold of another surface.
adj
Below the surface.
variations in subsurface conditions
We thought Enceladus was just boring and cold until the Cassini mission discovered a liquid water subsurface ocean.
Europa is thought to have subsurface liquid water.