below the surface Idiom
scratch the surface
barely begin, uncover only a few facts His first lecture on Stravinsky only scratched the surface.
scratch the surface|scratch|surface
v. phr. To learn or understand very little about something.

Usually used with a limiting adverb (as "only", "hardly").
We thought we understood Africa but when we made a trip there we found we had only scratched the surface. High school students have only scratched the surface of their subjects, and even after college graduation, they still find there is much more to learn.
skim the surface|skim|surface
v. phr. To do something very superficially.
He seems knowledgeable in many different areas but his familiarity is very superficial, since he only skims the surface of everything he touches.
on the surface
on the surface Superficially, to all outward appearances, as in
On the surface he appeared brave and patriotic, but his troops knew better. [Early 1700s]
surface
surface see
on the surface;
scratch the surface.
below the surface
Into or amid the added aspects of something, as against to those that are best calmly identified. When you address your book reports, amuse attending below the apparent of the argument and assay the author's stylistic choices.Learn more: below, surfacebelow/beneath the ˈsurface
what you cannot see but can alone assumption at or feel: She seems actual calm but below the apparent I’m abiding that she’s actual upset. ♢ Beneath the apparent of this admirable burghal there is abhorrent abjection and suffering, which tourists never see.Learn more: below, beneath, surface