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]
(..) gravitational pull. Aaand... Gotcha. - Thanks. - No problem. Clear the pad. I'm beaming to the surface. The surface of what? What, you're going down there? Are you nuts? - Spock, you can't do that. - Energize. (..)2009 Star Trek