Create a prison escape tunnel map (any genre). First create the basic prison layout, then place a hand-dug escape tunnel to freedom.

Could be historic, a fictional re-creation, or a complete fantasy. Create a fortress complex with escape tunnel. We're not talking the secret back way out of a castle, but something that was created over many years, in secret by desperate inmates destined to die in chains.

Could be an escape from Alcatrez, a maximum security prison in Serenity's Verse, Stalag Luft 19 - allied prisoners in Germany during WW2, the Count of Monte Cristo, or some BBEG's dungeon holding cells - whatever you can come up with...