The holographic principle suggests that the information content of a region of space can be thought of as encoded on the boundary of that region, much like a hologram.
Train people well enough so they can leave, treat them well enough so they don't want to.
"It is impossible to go through life without trust: that is to be imprisoned in the worst cell of all, oneself."
The more you can create a world that feels real, the more the audience will be drawn into it.