If you think she only did it for the money, you haven't even 'scratched the surface'. [=there are many other factors, reasons, etc., involved]
Despite the 'surface' differences between the two candidates, they are very similar in most ways.
The tension between them is beginning to 'rise to the surface'. [=it is becoming easy to see]
(..) and a year later, a daughter named after my mother, Bobbi. I knew only that I didn't need to reach with my bare hands anymore. That seeing the fish beneath the surface of the water was enough. That it was everything. My life, like all lives, mysterious, irrevocable and sacred. So very close. (..)2014 Wild