Submerged
Part of speech: verb
Definition: To sink out of sight.
Part of speech: adjective
Definition: Something that is underwater.
Example sentence: I'm not aware that I was consciously influenced by any director, though these things often happen unnoticed, submerged in the unconscious.
Subsurface
Part of speech: noun
Definition: Something that is below the layer that is on the surface.A surface which is a submanifold of another surface.
Part of speech: adjective
Definition: below the surface