Selecting the Face, Edge, Vertex, or Object Behind

To select the face, edge, vertex, or object behind another selected face, edge, vertex, or object, do one of the following:

Click Edit > Next Behind.
Right-click in the view window and click Next Behind.
When there are multiple faces behind, the one selected is relatively close to where you right-click.
Press the shortcut key B.
When there are multiple faces behind, the one selected is relatively close to the cursor.

Press Ctrl + B.
This option is useful when you are trying to select a face, edge, vertex, or object that is in the interior of a model, or when you do not want to change the model view to select an item.