There are many ways information can be acquired. It can be bought or stolen or had by intimidation. It can be discovered, either by accident or design, or, most commonly, by the fortuitous combination of both. It can come in a dream.
I have taken three years to learn, in various ways, the following things; the habits of each and every guard and each and every inmate, the design of the buildings right down to the plumbing, the best ways to hide small tools, the manufacture of rope from sheeting scraps, a technique to muffle noises in my cell, the exact timing of shift changes, and the recipe for a soft paste indistinguishable from the mortar between the stones.
Tonight I begin tunnelling. I do not fear the dogs or guns. I do not fear the deadly drops from the outer wall. I do not fear the loose lips of those whose knowledge came hardest, for they have been silenced. The only thing I fear is that I do not know what it is I might have missed.