(Not to mention my office building keeps our floor at sub-zero temperatures to give the impression our desks are actually outside in Antarctica on top of an iceberg and in the dead of winter.) (fashables.com)
1) The president, or any leader in general, is just the top of the iceberg. (politics.stackexchange.com)
The experimental part is only the top of the iceberg, the data analysis, the software maintenance, the preparation of the data for presentations are the rest of the work. (roche.com)