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]
(..) - Okay. That's just scary. - Wait. l've seen this floating speck before. That means we've passed it. That means we're not going straight. We got to get to the surface. We'll figure it out up there. Relax. Take a deep breath. Now, let's ask somebody for directions. Fine. Who? The speck? (..)2003 Finding Nemo