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I would start by "showing" what the guards are up to in the eyes of one of the plotters...then connect this vision to the eyes of another plotter who sees the same thing...thus "showing" without te...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/23850 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would start by "showing" what the guards are up to in the eyes of one of the plotters...then connect this vision to the eyes of another plotter who sees the same thing...thus "showing" without telling (they simply see the same thing as a pattern which implies a weakness and possible escape.) To build the suspense then have the plotters discover a "code" where they can speak without being heard...simple diagrams using a stick with some rocks...trips to the Library to get material, etc. So the guards keep the same routine...but your plotters have discovered a "gap" of some sort. I also would employ a "ruse"...something that surprises the reader as the plotters initiation of said plan goes undiscussed to the reader until it happens (some type of diversion like a fight in a cell or some planned event that becomes a distraction like a music show or something) Once the plan is executed upon there is no going back so that would be the ultimate focus of "show not tell"...the story can go however you want it to from there...you're the author.