sub-surface ( synonym found)
Definition of sub-surface:

(n) : 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 supoort it."
(adj) : below the surface
"...variations in subsurface conditions."
Definition of sub-surface:

(n) : 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 supoort it."
(adj) : below the surface
"...variations in subsurface conditions."
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