A long time ago, I remember a trick where there was a cell in excel that when clicked would open an easter's egg. I don't know anymore if that was an urban legend or not.

The fact is, should you hide text in an Excel's spreadsheet, in one a of billion cells, how hard is it for somebody else to find it without knowing its exact location?

Could this "hiding in barren vastness" strategy could be used as a second layer of encrypting?